Disclosed herein are novel substituted 4-amino-4-oxo-but-2-enyl derivatives, the processes for their preparation, as well as the therapeutic uses thereof, in particular as anticancer agents via selective antagonism and degradation of estrogen receptors.

The Estrogen Receptors (ER) belong to the steroid/nuclear receptor superfamily involved in the regulation of eukaryotic gene expression, cellular proliferation and differentiation in target tissues. ERs are in two forms: the estrogen receptor alpha (ERa) and the estrogen receptor beta (ERP) respectively encoded by the ESRI and the ESR2 genes. ERa and ERP are ligand-activated transcription factors which are activated by the hormone estrogen (the most potent estrogen produced in the body is 17P-estradiol). In the absence of hormone, ERs are largely located in the cytosol of the cell. When the hormone estrogen binds to ERs, ERs migrate from the cytosol to the nucleus of the cell, form dimers and then bind to specific genomic sequences called Estrogen Response Elements (ERE). The DNA/ER complex interacts with co-regulators to modulate the transcription of target genes.

ERa is mainly expressed in reproductive tissues such as uterus, ovary, breast, bone and white adipose tissue. Abnormal ERa signaling leads to development of a variety of diseases, such as cancers, metabolic and cardiovascular diseases, neurodegenerative diseases, inflammation diseases and osteoporosis.

ERa is expressed in not more than 10% of normal breast epithelium but approximately 50-80% of breast tumors. Such breast tumors with high level of ERa are classified as ERa-positive breast tumors. The etiological role of estrogen in breast cancer is well established and modulation of ERa signaling remains the mainstay of breast cancer treatment for the majority ERa-positive breast tumors. Currently, several strategies for inhibiting the estrogen axis in breast cancer exist, including: 1- blocking estrogen synthesis by aromatase inhibitors that are used to treat early and advanced ERa-positive breast cancer patients; 2- antagonizing estrogen ligand binding to ERa by tamoxifen which is used to treat ERa-positive breast cancer patients in both pre- and post- menopausal setting; 3- antagonizing and downregulating ERa levels by fulvestrant, which is used to treat breast cancer in patients that have progressed despite endocrine therapies such as tamoxifen or aromatase inhibitors. Although these endocrine therapies have contributed enormously to reduction in breast cancer development, about more than one-third of ERa-positive patients display de- novo resistance or develop resistance over time to such existing therapies. Several mechanisms have been described to explain resistance to such hormone therapies. For example, hypersensitivity of ERa to low estrogen level in treatment with aromatase inhibitors, the switch of tamoxifen effects from antagonist to agonist effects in tamoxifen treatments or multiple growth factor receptor signaling pathways. Acquired mutations in ERa occurring after initiation of hormone therapies may also play a role in treatment failure and cancer progression. Certain mutations in ERa, particularly those identified in the Ligand Binding Domain (LBD), result in the ability to bind to DNA in the absence of ligand and confer hormone independence in cells harboring such mutant receptors.

Hence, there is still a need to provide potent compounds suitable as ER-directed therapies.

The inventors have now found novel compounds which are selective estrogen receptors covalent antagonists (SERCA).

Disclosed herein are compounds of the formula (I), or pharmaceutically acceptable salts thereof: wherein:

R3 represents a hydrogen atom, a -COOH group or a -OH group;

R3’ and R3” independently represent a hydrogen atom, a methyl group, a methoxy group, a chlorine atom, a fluorine atom or a cyano group;

R4 represents a hydrogen atom, a (Ci-C3)alkyl group or a cyclopropyl;

R5 independently represents a (Ci-C3)alkyl group such as a methyl group, a halogen atom, such as a fluorine atom, a cyano group, or a (Ci-C3)fluoroalkyl group, such as a trifluoromethyl;

R6 represents a group selected from: ■ a phenyl group, said phenyl group being optionally substituted by 1 to 3 substituents independently selected from a halogen atom; a (Ci-Ce)alkyl group, optionally substituted with a cyano group or a -OH group; a (Ci-C6)fluoroalkyl group; a (C3-C6)cycloalkyl group; a (Ci-C6)alkoxy group; a (Ci-C6)fluoroalkoxy group; a cyano group; a trifluoromethylsulfonyl group; a (Ci -Chalky Ithio group; a (Ci-C4)fluoroalkylthio group; a (Ci-C4)alkylsulfonyl group and a -OH group;

■ a fused phenyl group, selected from phenyl groups fused with a (C3-C6)cycloalkyl, which (C3-C6)cycloalkyl ring optionally comprises an unsaturation and, wherein the fused phenyl group is optionally substituted with 1 to 3 substituents independently selected from a (Ci-C3)alkyl group, a hydroxy group, a halogen atom, a (Ci-C6)fluoroalkyl group and a (Ci-C3)alkoxy group;

■ a bicyclic group comprising 5 to 12 carbon atoms, optionally comprising 1 to 2 unsaturations; optionally substituted with 1 to 4 substituents independently selected from: a fluorine atom, a -OH group, a (Ci-C3)alkyl group, a (Ci-C3)fluoroalkyl group, a (Ci-C3)alkoxy group, a (Ci-C3)fluoroalkoxy group and an oxo group;

■ a heteroaryl group comprising 2 to 9 carbon atoms and comprising from 1 to 3 heteroatoms independently selected from oxygen, nitrogen and sulfur, and at least 5 atoms including carbon atoms and heteroatoms, such as a pyridyl group or a pyrrolyl group, said heteroaryl group being optionally substituted with 1 to 3 substituents independently selected from a halogen atom, a (Ci-Ce)alkyl group, a (Ci-C6)fluoroalkyl group, a (Ci-C6)alkoxy group, a (Ci-C6)fluoroalkoxy group, a cyano group, a carbamoyl group and a -OH group;

■ a cycloalkyl group comprising 3 to 7 carbon atoms, said cycloalkyl group being saturated or partially saturated and being optionally substituted with 1 to 4 substituents independently selected from: o a fluorine atom, a -OH group, a (Ci-C3)alkyl group, a (Ci-C3)fluoroalkyl group, a (Ci-C3)alkoxy group, a (Ci-C3)fluoroalkoxy group, an oxo group, o a (C3-C6)cycloalkyl group, and a phenyl group, said (C3-C6)cycloalkyl or phenyl groups being optionally substituted with one or two halogen atom(s) or (Ci-C3)alkyl group(s); ■ a (C3-C6)cycloalkyl(Ci-C3)alkyl group, optionally substituted on the cycloalkyl with 1 to 4 substituents independently selected from: a fluorine atom, a -OH group, a (Ci-C4)alkyl group, a (Ci-C3)fluoroalkyl group, a (Ci-C3)fluoroalkoxy group and an oxo group;

■ a 4 to 7 membered-heterocycloalkyl group comprising 1 or 2 heteroatoms independently selected from oxygen, nitrogen and sulfur, such as a tetrahydropyranyl or a tetrahydrofuranyl group, said heterocyclo alkyl group being saturated or partially saturated and being optionally substituted with 1 to 3 substituents independently selected from: a fluorine atom, a (Ci-C3)alkyl group, a (Ci-C3)fluoroalkyl group, a (Ci-C3)fluoroalkoxy group, an oxo group, a (Ci-C3)alkoxy group, and a -OH group;

■ a (Ci-C6)alkyl group, such as an isobutyl group or an ethylbutyl group, said alkyl group being optionally substituted with 1 to 4 substituents independently selected from: a fluorine atom, a (Ci-C3)alkoxy group, a (Ci-C3)fluoroalkoxy group and a -OH group; and

■ a phenyl(Ci-C2)alkyl group, said phenyl group being optionally substituted with 1 to 3 substituents independently selected from a halogen atom; a (Ci-C3)alkyl group; a (Ci-C3)fluoroalkyl group; a (Ci-C3)alkoxy group; a (Ci-C3)fluoroalkoxy group; a cyano group; and a -OH group;

X represents -CH2-, -O- or -S-; n is 0, 1 or 2; m is 0 or 1 ; and

Z represents a group selected from: wherein: o R1 and R2 independently represent a hydrogen atom, a -CH3 group, a -CH2CH3 group, or a -CH2CH2OH group, or R1 and R2 forms a 4 to 6 membered- heterocycloalkyl group with the nitrogen atom to which R1 and R2, are attached, said heterocycloalkyl group optionally comprising an additional heteroatom selected from oxygen, nitrogen and sulfur; o Y represents -CH2-, -CH=, -CR7=, -O- or -NH-, wherein R7 represents a fluorine atom or a (Ci-C3)alkyl group; o represents a single bond or a double bond; and o p is 0 or 1.

Y represents -CH2-, -O- or -NH- when represents a single bond and Y represents -CH= or -CR7= when represents a double bond.

The compounds of formula (I) can contain one or more asymmetric carbon atoms. They may therefore exist in the form of enantiomers.

The compounds of formula (I) may be present as well under tautomer forms.

The compounds of formula (I) may exist in the form of bases, acids, zwitterion or of addition salts with acids or bases. Hence, herein are provided compounds of formula (I) or pharmaceutically acceptable salts thereof.

These salts may be prepared with pharmaceutically acceptable acids or bases, although the salts of other acids or bases useful, for example, for purifying or isolating the compounds of formula (I) are also provided.

Among suitable salts of the compounds of formula (I), hydrochloride may be cited.

As used herein, the terms below have the following definitions unless otherwise mentioned throughout the instant specification:

- a halogen atom: a fluorine, a chlorine, a bromine or an iodine atom, and in particular a fluorine and a chlorine atom;

- an oxo: a “=O” group;

- an alkyl group: a linear or branched saturated hydrocarbon-based aliphatic group comprising, unless otherwise mentioned, from 1 to 6 carbon atoms (noted “(Ci-C6)alkyl”). By way of examples, mention may be made of, but not limited to: methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec -butyl, tert-butyl, pentyl, isopentyl, hexyl and isohexyl groups, and the like;

- a cycloalkyl group: a monocyclic alkyl group comprising, unless otherwise mentioned, from 3 to 7 carbon atoms, saturated or partially unsaturated and unsubstituted or substituted. By way of examples, mention may be made of, but not limited to: cyclopropyl, cyclobutyl, cyclopentyl, cyclobutenyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptyl, cycloheptenyl groups and the like, in particular a cyclopentyl, a cyclohexyl, a cycloheptyl, a cycloheptenyl, or a cyclohexenyl;

- a heterocycloalkyl group: a 4 to 7-membered cycloalkyl group, saturated or partially unsaturated, comprising 1 to 2 heteroatoms independently selected from oxygen, nitrogen and sulfur, in particular being oxygen or nitrogen. By way of examples, mention may be made of, but not limited to: morpholinyl, piperazinyl, piperidinyl, pyrrolidinyl, aziridinyl, oxanyl, oxetanyl, tetrahydropyranyl, morpholinyl, tetrahydrofuranyl, oxepanyl, diazepanyl, dioxanyl, tetrahydropyranyl, and tetrahydro thiopyranyl. The heterocycloalkyl is advantageously tetrahydrofuranyl or tetrahydropyranyl.

- a fluoroalkyl group: an alkyl group as previously defined where the alkyl group is substituted with at least one fluorine atom. In other terms, at least one hydrogen atom of the alkyl group is replaced by a fluorine atom. By way of example, mention may be made of -CH2F, -CHF2, -CH2CHF2, -CH2CH2F and the like. When all the hydrogen atoms belonging to the alkyl group are replaced by fluorine atoms, the fluoroalkyl group can be named perfluoroalkyl group. By way of example, mention may be made of trifluoromethyl group or trifluoroethyl group and the like;

- an alkoxy group: an -O-alkyl group where the alkyl group is as previously defined. By way of examples, mention may be made of, but not limited to: methoxy, ethoxy, propoxy, isopropoxy, linear, secondary or tertiary butoxy, isobutoxy, pentoxy or hexoxy groups, and the like;

- a fluoroalkoxy group: an -O-alkyl group where the alkyl group is as previously defined and where the alkyl group is substituted with at least one fluorine atom. In other terms, at least one hydrogen atom of the alkyl group is replaced by a fluorine atom. By way of example, mention may be made of -OCH2F, -OCHF2, -OCH2CH2F and the like. When all the hydrogen atoms belonging to the alkyl group are replaced by fluorine atoms, the fluoroalkoxy group can be named perfluoroalkoxy group. By way of example, mention may be made of trifluoromethoxy group and the like;

- a (Ci-C4)alkylthio group also named a (Ci-C4)alkylsulfanyl group: a -S-alkyl group where the alkyl group is as previously defined. By way of examples, mention may be made of, but not limited to: methylthio, ethylthio, propylthio, isopropylthio, linear, secondary or tertiary butylthio, isobutylthio, and the like;

- a (Ci-C4)alkylsulfonyl group: a -SCE-alkyl group where the alkyl group is as previously defined. By way of examples, mention may be made of, but not limited to -SO2CH3, -SO2CH2CH3 and the like;

- a (Ci-C4)fluoroalkylthio group also named a (Ci-C4)fluoroalkylsulfanyl group: a -S- fluoroalkyl group where the fluoroalkyl group is as previously defined. By way of examples, mention may be made of, but not limited to: fluoro methylthio, difluoromethylthio, trifluoromethylthio and the like;

- a fused phenyl group: a bicyclic radical comprising from 7 to 10 carbon atoms and that contains a phenyl moiety. Said phenyl moiety may be fused to a (C3-C6)cycloalkyl group, i.e. the phenyl moiety may share a bond with said (C3-C6)cycloalkyl group. The fused phenyl group may be bound to the rest of the molecule by its phenyl moiety. It may be substituted. Examples are, but are not limited to indanyl, bicyclo[4.2.0] octa- 1(6), 2, 4-trienyl, tetrahydronaphthalenyl and the like;

- a heteroaryl group: a cyclic 5 to 10-membered aromatic group containing between 2 and 9 carbon atoms and containing between 1 and 3 heteroatoms, such as nitrogen, oxygen or sulfur. Such nitrogen atom may be substituted with an oxygen atom in order to form a -N- O bond. Such -N-0 bond can be in a form of a N-oxide (-N ⁺ -0‘). Said heteroaryl group may be monocyclic or bicyclic. By way of examples of heteroaryl groups, mention may be made of, but not limited to: thiophene, furan, thiadiazole, thiazole, imidazole, pyridazine, triazine, pyrazine, oxadiazole, pyrazole, isothiazole, oxazole, isoxazole, pyridine, pyrimidine, benzotriazole, benzoxazole, pyrrolo[2,3-b]pyridine, benzimidazole, benzoxadiazole, benzothiazole, benzothiadiazole, benzofuran, indole, isoquinoline, indazole, benzisoxazole, benzisothiazole, pyridone groups and the like. The heteroaryl group is advantageously pyridine, pyrrole, imidazole, pyrazine, furane, thiazole, pyrazole, thiadiazole, pyridazine, pyridone and pyrimidine, and more particularly pyridine, pyridone and pyrrole; - a bicyclic group, generally comprising 5 to 12 carbon atoms, is a hydrocarbon group selected from groups comprising two rings connected through:

• a single common atom: a “spirobicyclic ring”. Such spiro bicyclic alkyl generally comprises 5 to 11 carbon atoms referring to a “spiro(C5-Cn)bicyclic ring”. The rings may be saturated or partially unsaturated. Such spirobicyclic ring may be unsubstituted or substituted, in particular by at least one (Ci-C3)alkyl group such as methyl or a fluorine. By way of examples of spiro(Cs-Cii)bicyclic ring as for the definition of R6, mention may be made of, but not limited to: spiro[2.3]hexane, spiro[3.3]heptane, spiro[3.3]heptene, spiro [2.5] octane and 7-azaspiro[3.5]nonane. The spiro(Cs-Cii)bicyclic ring is advantageously spiro[3.3]heptane or spiro[3.3]heptene still for the R6 group.

• two common atoms: In that case the bicyclic group comprises 7 to 12 carbon atoms and optionally comprises 1 to 2 unsaturations. By way of examples of such bicyclic groups, mention may be made of, but not limited to: cis-l,3a,4,5,6,6a-hexahydropentalenyl group, bicyclo[3.1.0]hexan-l-yl, bicyclo[4.1.0]heptanyl and octahydropentalenyl.

• three or more common atoms: In that case the bicyclic group comprises 6 to 10 carbon atoms, such bicyclic group may be referred to as a “bridged (C6-Cio)cycloalkyl” group, the rings share three or more atoms and the bridge contains at least one atom, for example 1, 2 or 3 atoms and preferentially 1 atom. By way of examples of such bridged cycloalkyl groups, mention may be made of, but not limited to bicyclo[3.2.1]octan-3-yl and bicyclo[2.2. l]heptan-2-yl.

- a zwitterion means: a globally neutral molecule with a positive and a negative electrical charge and having an acidic group and a basic group.

In another embodiment, in the compounds of formula (I) as defined above, Z represents a group:

According to this embodiment, the compounds of formula (I) as defined above are of formula (I’):

(D

In another embodiment, in the compounds of formula (I) or (I') as defined above,

Y represents -CH2-, -CH=, -O- or -NH-.

In another embodiment, in the compounds of formula (I) or (I') as defined above,

Y represents -O-.

In another embodiment, in the compounds of formula (I) or (I') as defined above,

Y represents -CH2-.

In another embodiment, in the compounds of formula (I) or (I') as defined above,

Y represents -CH=.

In another embodiment, in the compounds of formula (I) or (I') as defined above,

Y represents -NH-.

In another embodiment, in the compounds of formula (I) or (I') as defined above, represents a single bond.

In another embodiment, in the compounds of formula (I) or (I') as defined above, represents a double bond.

In another embodiment, in the compounds of formula (I) or (I') as defined above, p is 1.

In another embodiment, in the compounds of formula (I) or (I') as defined above, p is 0.

In another embodiment, in the compounds of formula (I) as defined above, Z represents a group: According to this embodiment, the compounds of formula (I) as defined above are of formula (I”):

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R1 and R2 are a -CH3 group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R3 is a -COOH group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R3 is a -OH group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R3 is a hydrogen atom.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R3’ and R3” represent a hydrogen atom.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, X represents -CH2-.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, X represents -O-.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, X represents -S-.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R4 represents a hydrogen atom.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, n is 0.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, m is 1. In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, m is 0.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R6 represents:

■ a phenyl group, said phenyl group being optionally substituted by 1 to 3 substituents independently selected from a halogen atom; a (Ci-Ce)alkyl group, optionally substituted with a cyano group or a -OH group; a (Ci-C6)fluoroalkyl group; a (C3-C6)cycloalkyl group; a (Ci-C6)alkoxy group; a (Ci-C6)fluoroalkoxy group; a cyano group; a trifluoromethylsulfonyl group; a (Ci -Chalky Ithio group; a (Ci-C4)fluoroalkylthio group; a (Ci-C4)alkylsulfonyl group and a -OH group; or

■ a heteroaryl group comprising 2 to 9 carbon atoms and comprising from 1 to 3 heteroatoms independently selected from oxygen, nitrogen and sulfur, and at least 5 atoms including carbon atoms and heteroatoms, such as a pyridyl group or a pyrrolyl group, said heteroaryl group being optionally substituted with 1 to 3 substituents independently selected from a halogen atom, a (Ci-Ce)alkyl group, a (Ci-C6)fluoroalkyl group, a (Ci-C6)alkoxy group, a (Ci-C6)fluoroalkoxy group, a cyano group, a carbamoyl group and a -OH group.

In another embodiment, in the compounds of formula (I) , (I’) or (I”) as defined above, R6 represents a phenyl group, said phenyl group being optionally substituted by 1 to 3 substituents independently selected from a halogen atom; a (Ci-C6)alkyl group, optionally substituted with a cyano group or a -OH group; a (Ci-C6)fluoroalkyl group; a (C3-C6)cycloalkyl group; a (Ci-C6)alkoxy group; a (Ci-C6)fluoroalkoxy group; a cyano group; a trifluoromethylsulfonyl group; a (Ci-C4)alkylthio group; a (Ci-C4)fluoroalkylthio group; a (Ci-C4)alkylsulfonyl group and a -OH group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R6 represents a phenyl group, said phenyl group being optionally substituted with 1 or 2 substituents independently selected from a chlorine atom, a fluorine atom and a methyl group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R6 represents a phenyl group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R6 represents a phenyl group, said phenyl group being substituted with 1 or 2 substituents independently selected from a chlorine atom, a fluorine atom, and a methyl group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R6 represents heteroaryl group comprising 2 to 9 carbon atoms and comprising from 1 to 3 heteroatoms independently selected from oxygen, nitrogen and sulfur, and at least 5 atoms including carbon atoms and heteroatoms, such as a pyridyl group or a pyrrolyl group, said heteroaryl group being optionally substituted with 1 to 3 substituents independently selected from a halogen atom, a (Ci-Ce)alkyl group, a (Ci-C6)fluoroalkyl group, a (Ci-C6)alkoxy group, a (Ci-C6)fluoroalkoxy group, a cyano group, a carbamoyl group and a -OH group.

In another embodiment, in the compounds of formula (I), (I’) or (I”) as defined above, R6 represents a pyridyl group, said pyridyl group being substituted by two substituents independently selected from a halogen atom and a (Ci-C6)alkoxy group, and more particularly selected from a fluorine atom and a methoxy group.

In another embodiment, in the compounds of formula (I) or (I’), R3 is a -COOH group and R6 is a phenyl group substituted with 1 or 2 substituents independently selected from a chlorine atom, a fluorine atom, and a methyl group. In such embodiment, R3’ and R3” are in particular hydrogen atoms. Still in such embodiment, R4 is a hydrogen atom, X is a -CH2- group, m is equal to 1 and n is equal to 0. In such embodiment, R1 and R2 are a -CH3 group, Y is -O-, represents a single bond, and p is equal to 1.

In another embodiment, in the compounds of formula (I) or (I”), R3 is a -COOH group, R6 is a phenyl group substituted with 1 or 2 substituents independently selected from a chlorine atom, a fluorine atom and a methyl group. In such embodiment, R3’ and R3” are in particular hydrogen atoms. Still in such embodiment, R4 is a hydrogen atom, X is a -CH2- group, m is equal to 1 and n is equal to 0. In such an embodiment, R1 and R2 are a -CH3 group.

Among the compounds of formula (I), (I’) or (I”) described herein, mention may be made in particular of the following compounds or a pharmaceutically acceptable salt thereof, in particular hydrochloride salt thereof: (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (1)

(S,E)-8-(2-chloro-4-fluorophenyl)-9-(4-((l-(4-(dimethylam ino)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (2)

(S,E)-8-(4-chloro-2-fluorophenyl)-9-(4-((l-(4-(dimethylam ino)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (3)

(S,E)-8-(2-chloro-3-fluorophenyl)-9-(4-((l-(4-(dimethylam ino)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (4)

(S,E)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrr olidin-3- yl)oxy)phenyl)-8-(2-fluoro-4-methylphenyl)-6,7-dihydro-5H-be nzo[7]annulene-3- carboxylic acid, (5)

(S,E)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrr olidin-3- yl)oxy)phenyl)-8-phenyl-6,7-dihydro-5H-benzo[7]annulene-3-ca rboxylic acid, (6) (S,E)-8-(3-chloro-4-methylphenyl)-9-(4-((l-(4-(dimethylamino )-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (7)

(S,E)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrr olidin-3- yl)oxy)phenyl)-8-(2,4-dimethylphenyl)-6,7-dihydro-5H-benzo[7 ]annulene-3- carboxylic acid, (8)

(S,E)-8-(2-chlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-ox obut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (9)

(S,E)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrr olidin-3- yl)oxy)phenyl)-8-(2-fluoro-6-methoxypyridin-3-yl)-6,7-dihydr o-5H- benzo[7]annulene-3-carboxylic acid, (10)

(S,E)-8-(2-chloro-4-methylphenyl)-9-(4-((l-(4-(dimethylam ino)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (11) (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)azetidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene -3-carboxylic acid, (12) (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl) azetidin- 3 -y l)methy l)pheny 1) -6,7 -dihydro -5H-benzo [7 ] annulene- 3 -c arboxy lie acid compound with 2,2,2-trifluoroacetic acid, (13) (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)azetidin-3-ylidene)methyl)phenyl)-6,7-dihydro-5H-benzo[7] annulene-3- carboxylic acid, (14) (R,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (15) (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annu lene-3-carboxylic acid, (16) (R,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annu lene-3-carboxylic acid, (17) (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)pyrrolidin-3-yl)methyl)phenyl)-6,7-dihydro-5H-benzo[7]ann ulene-3-carboxylic acid, Isomer 1, (18) (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)pyrrolidin-3-yl)methyl)phenyl)-6,7-dihydro-5H-benzo[7]ann ulene-3-carboxylic acid, Isomer 2, (19) 8-(2,4-dichlorophenyl)-9-(4-((Z)-(l-((E)-4-(dimethylamino)-4 -oxobut-2-en-l- yl)pyrrolidin-3-ylidene)methyl)phenyl)-6,7-dihydro-5H-benzo[ 7]annulene-3- carboxylic acid, (20) (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)azetidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid, (21) (E)-8-(2,4-dichlorophenyl)-9-(4-(2-((4-(dimethylamino)-4-oxo but-2-en-l- yl)amino)ethoxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-ca rboxylic acid, (22) (S,E)-4-(3-(4-(8-(2,4-dichlorophenyl)-3-hydroxy-6,7-dihydro- 5H-benzo[7]annulen- 9-yl)phenoxy)pyrrolidin- l-yl)-N,N-dimethylbut-2-enamide, (23) (S,E)-4-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-2,3-dihydrobenzo[b]oxepine-8- carboxylic acid, (24) (S,E)-6-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-7,8-dihydronaphthalene-2-carb oxylic acid, (25) (S,E)-4-(3-(4-(8-(2,4-dichlorophenyl)-6,7-dihydro-5H-benzo[7 ]annulen-9- yl)phenoxy)pyrrolidin- l-yl)-N,N-dimethylbut-2-enamide, (26) (S,E)-4-(3-(4-(4-(2,4-dichlorophenyl)-8-hydroxy-2,3-dihydrob enzo[b]thiepin-5- yl)phenoxy)pyrrolidin- l-yl)-N,N-dimethylbut-2-enamide, (27).

Another embodiment is a compound selected from the above list, or a pharmaceutically acceptable salt thereof, for use in therapy, especially as an inhibitor and degrader of estrogen receptors.

Another embodiment is a compound selected from the above list, or a pharmaceutically acceptable salt thereof, for use in the treatment of cancer, especially breast cancer.

Another embodiment is a method of inhibiting and degrading estrogen receptors, comprising administering to a subject in need thereof, in particular a human, a therapeutically effective amount of a compound selected from the above list, or a pharmaceutically acceptable salt thereof.

Another embodiment is a method of treating ovulatory dysfunction, cancer, endometriosis, osteoporosis, benign prostatic hypertrophy or inflammation, comprising administering to a subject in need thereof, in particular a human, a therapeutically effective amount of a compound selected from the above list, or a pharmaceutically acceptable salt thereof.

Another embodiment is a method of treating cancer, comprising administering to a subject in need thereof, in particular a human, a therapeutically effective amount of a compound selected from the above list, or a pharmaceutically acceptable salt thereof.

Another embodiment is a pharmaceutical composition comprising as active principle an effective dose of a compound selected from the above list, or a pharmaceutically acceptable salt thereof, and also at least one pharmaceutically acceptable excipient. The compounds of the formula (I), (I’) or (I”) can be prepared by the following processes.

The compounds of the formula (I), (I’) or (I”) and other related compounds having different substituents are synthesized using techniques and materials described below or otherwise known by the skilled person in the art. In addition, solvents, temperatures and other reaction conditions presented below may vary as deemed appropriate to the skilled person in the art.

General below methods for the preparation of compounds of formula (I), (I’) or (I”) optionally modified by the use of appropriate reagents and conditions for the introduction of the various moieties found in the formula (I), (I’) or (I”) as described below.

The following abbreviations and empirical formulae are used:

BAST Deoxo-Fluor

BOC2O di-ter-butyldicarbonate

CS2CO3 Cesium carbonate

CO Carbon monoxide

DBU l,8-Diazabicyclo[5.4.0]undec-7-ene

DCM Dichloromethane

DIEA Diisopropylethylamine

DMF N,N-dimethylformamide

DMAP Dimethylaminopyridine

DMSO Dimethyl sulfoxide

Et2O Diethyl ether

EtOAc Ethyl acetate

EtOH Ethanol

H2 Hydrogen

HATU 2-(3H-[l,2,3]triazolo[4,5-b]pyridin-3-yl)-l,l,3,3- tetramethylisouronium hexafluorophosphate(V)

HBTU (2-( IH-benzotriazol- 1-yl)- 1 , 1 ,3,3-tetramethyluronium hexafluorophosphate

HC1 Hydrochloric acid

HPLC High performance liquid chromatography K2CO3 Potassium carbonate

KHMDS Potassium bis(trimethylsilyl)amide

KOAc Potassium acetate

KOH Potassium hydroxide

KOPh Potassium phenolate

LiHMDS Lithium bis(trimethylsilyl)amide

LiOH Lithium hydroxide

MeCN Acetonitrile

MeOH Methanol

MeTHF 2-Methyltetrahydrofuran

MgSO ₄ MgSO ₄

MTBE Methyl tert-butyl ether n-BuLi n-Butyllithium

Na ₂ SO ₄ Sodium sulfate

NaBH ₄ Sodium borohydride

NaCl Sodium chloride

NaH Sodium hydride

NaHCO ₃ Sodium bicarbonate

NaHSO ₃ Sodium bisulfate

NaOH Sodium hydroxide

NH ₄ C1 Ammonium chloride

NH ₄ OH Ammonium hydroxide

Pd ₂ (dba) ₃ tris(dibenzylideneacetone)dipalladium(0)

Pd/C Palladium on carbon

Pd(dppf)Cl ₂ [1,1 '-Bis(diphenylphosphino)ferrocene]dichloropalladium(II)

Pd(OAc) ₂ Palladium acetate

Pd(PPh ₃ ) ₂ Cl ₂ bis (triphenylphosphine) palladium(II) dichloride

PhOK Potassium phenolate

PPh ₃ Tripheny Ipho sphine

RT Room temperature

SCX Strong cation exchange

SFC Supercritical Fluid Chromatography TEA Triethylamine

TFA Trifluoro acetic acid

THF Tetrahydrofuran

XANTPHOS (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane)

SCHEME la: Preparation of compounds of the formula (I) or (I’) - General process According to SCHEME la, in which R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, Rl, R2,

R3, R3’, R3”, R4, R5, X, Y, m, n, p and are defined as described above, and R6 is a phenyl or heteroaryl group, compound 1A can be converted in STEP 1 to compound IB by treatment with aryl or heteroaryl bromide or iodide in the presence of a palladium catalyst, for example tris(dibenzylideneacetone)dipalladium(0) Pd2(dba)3, and a phosphine such as (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane) (XANTPHOS) in solution in toluene by heating up to reflux of solvent, in presence of a base such as K2CO3 or CS2CO3. Alternative way to prepare compound IB, wherein R6 can be any of the groups defined above for R6 in formula (I) or (I’), is described in SCHEME If below.

Compound IB can be converted in STEP 2 to compound 1C by treatment with N,N-bis(trifluoromethylsulfonyl)aniline in the presence of a base such as DBU or NaH, or KHMDS at -50°C, in a solvent such as MeTHF.

Compound 1C can be converted in STEP 3 to compound ID by treatment for example with bis(pinacolato)diboron, and with a palladium catalyst, for example bis (triphenylphosphine)palladium(II) dichloride Pd(PPh3)2Ch, and a phosphine, such as triphenylphosphine, in solution in toluene by heating up to reflux of solvent, in presence of a base such as KOPh.

Compound IF can be prepared in a Suzuki coupling reaction either between compound ID and compound IE in STEP 4 or between compounds 1C and compound IE’ in STEP 5 using for example [l,r-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, as catalyst, in a mixture of dioxane and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent.

When R3a is -COOMe, -COOEt, or a protected -OH such as O-pivaloyl, deprotection can be performed in STEP 6 by treatment with an aqueous solution of sodium hydroxide (NaOH) 2N or lithium hydroxide (LiOH) in THF or dioxane. When R3 is -COOH, extraction of the product could give the sodium or lithium salt of compound of formula (I) or (I’). The acidification with an aqueous solution of HC1 2N to pH 6-7 could give the neutral form of compound of formula (I) or (!’). The acidification with an aqueous solution of HC1 2N to pH 1-2 could give the hydrochloride salt of compound (I) or (I’). The purification using HPLC in presence of formic acid or trifluoroacetic acid in the eluent could give the formate or trifluoroacetate salt of compound (I) or (I’).

SCHEME lb: Preparation of compounds of the formulae (I) and (I’) - General process

According to SCHEME lb in which R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, and Rl, R2, R3, R3’, R3”, R4, R5, R6, X, Y, m, n, and p are defined as described above, compound 1C can be converted in STEP 1 to compound 1H by treatment with compound 1G using for example [1,1 '-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, as catalyst, in a mixture of dioxane and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent.

Compound 1H can be converted in STEP 2 to compound II by treatment with trifluoromethanesulfonic anhydride in the presence of pyridine in DCM.

Compound II can be converted in STEP 3 to compound IL (Y = -NH-) in a Buchwald coupling reaction with compound 1J in dioxane at 130°C using for example xantphos / palladium acetate (Pd(OAc)2) as catalytic system.

Compound 1H can be converted in STEP 4 to compound IL (Y = -O-) by reaction with compound IK (A = Br or I) in presence of a base such as CS2CO3 in DMF or MeCN, or under Mitsunobu conditions, when (A = -OH), using for example N,N,N',N'-tetramethylazodicarboxamide and triphenylphosphine as coupling agents in THF as a solvent.

Compound IL can be converted in STEP 5 to compound IM by treatment with TFA in DCM or HC1 in dioxane.

Compound IM can be converted in STEP 6 to compound IF’ by treatment with compound IN, in presence of a base such as DIEA in DMF or MeCN.

When R3a is -COOMe, -COOEt, or a protected -OH such as O-pivaloyl, deprotection can be performed in STEP 7 by treatment with an aqueous solution of sodium hydroxide (NaOH) 2N or lithium hydroxide (LiOH) in THF or dioxane. When R3 is -COOH, extraction of the product can give the sodium or lithium salt of compound of formula (I) or (I’). The acidification with an aqueous solution of HC1 2N to pH 6-7 can give the neutral form of compound of formula (I) or (I’). The acidification with an aqueous solution of HC1 2N to pH 1-2 can give the hydrochloride salt of compound of formula (I) or (I’). The purification using HPLC in presence of formic acid or trifluoroacetic acid in the eluent can give the formate or trifluoroacetate salt of compound of formula (I) or (I’). SCHEME 1c - Part-1: Preparation of compounds of the formula (I) or (I’) - General process SCHEME 1c - Part-2

According to SCHEME 1c Part-1 and Part-2 in which R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, and Rl, R2, R3, R3’, R3”, R4, R5, R6, X, Y, m, n and p are defined as described above, compound 10 can be converted in STEP 1 to compound IP by treatment with compound 1G using for example [l,r-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, as catalyst, in a mixture of dioxane and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent.

Compound IP can be converted in STEP 2 to compound IQ by treatment with trifluoromethanesulfonic anhydride in the presence of pyridine in DCM.

Compound IQ can be converted in STEP 3 to compound 1R (Y = -NH-) in a Buchwald coupling reaction with compound 1J in dioxane at 130°C using for example xantphos / palladium acetate (Pd(OAc)2 as catalytic system.

Compound IP can be converted in STEP 4 to compound 1R (Y = -O-) by reaction with compound IK (A = -Br or -I) in presence of a base such as cesium carbonate (CS2CO3) in DMF or MeCN, or under Mitsunobu conditions, when (A = -OH), using for example N,N,N',N'-tetramethylazodicarboxamide and triphenylphosphine as coupling agents in THF as a solvent.

Compound 1R can be converted in STEP 5 to compound IS by treatment with for example pyridinium tribromide in DCM or THF at room temperature followed by treatment of the obtained residue with TFA in DCM or HC1 in dioxane.

Compound IS can be converted in STEP 6 to compound IT by treatment with compound IN, in the presence of a base such as DIEA in DMF or MeCN.

Compound IT can be converted in STEP 7 to compound 1U by treatment for example with bis(pinacolato)diboron, and with a palladium catalyst, for example bis(triphenylphosphine)palladium(II) dichloride Pd(PPh3)2Ch, and a phosphine such as triphenylphosphine in solution in toluene by heating up to reflux of solvent in presence of a base such as KOPh or AcOK.

Compound IF’ can be prepared in a Suzuki coupling reaction either between 1U and R6Br or R6I or R6OTf in STEP 8 or between compounds IT and R6B(OR’)2 or R6BF3K, wherein -B(OR’)2 is a boronic acid or a pinacolate ester and R6 is as above defined, in STEP 9 using for example [l,l'-bis(diphenylphosphino) ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, as catalyst, in a mixture of dioxane and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent.

When R3a is -COOMe, -COOEt, or a protected -OH such as O-pivaloyl, deprotection can be performed in STEP 10 by treatment with an aqueous solution of sodium hydroxide (NaOH) 2N or lithium hydroxide (LiOH) in THF or dioxane. When R3 is -COOH, extraction of the product could give the sodium or lithium salt of compound of formula (I) or (I’). The acidification with an aqueous solution of HC12N to pH 6-7 can give the neutral form of compound of formula (I) or (I’). The acidification with an aqueous solution of HC1 2N to pH 1-2 can give the hydrochloride salt of compound of formula (I) or (I’). The purification using HPLC in presence of formic acid or trifluoroacetic acid in the eluent can give the formate or trifluoroacetate salt of compound of formula (I) or (I’).

SCHEME Id: Alternative method of preparation of compounds of the formula (IS) —

General process

According to SCHEME Id, in which R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, and R3, R3’, R3”, R4, R5, X, m, n and p are defined as described above, compound 10 can be converted in STEP 1 to compound 10’ by treatment for example with 1 bis(pinacolato)diboron, and with a palladium catalyst, for example bis(triphenylphosphine)palladium(II) dichloride Pd(PPh3)2Ch, and a phosphine such as triphenylphosphine in solution in toluene by heating up to reflux of solvent in presence of a base such as KOPh or AcOK.

Compound 1W can be prepared in a Suzuki coupling reaction either between compounds 10 and IV in STEP 2 or between compounds 10’ and IV’ in STEP 2’ in the presence of a palladium catalyst, for example [l,r-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, in a mixture of dioxane and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent.

Compound 1W can be converted in STEP 3 to compound IS by treatment with for example pyridinium tribromide in DCM or THF at room temperature.

SCHEME le: Preparation of compounds of the formula (10) wherein R3a = C02Me -

General process

Compound 1O

According to SCHEME le, in which X, m, R3’, R3”, R3a = C02Me and R4 are defined as described above, compound 10 could be prepared as follows: compound IX (commercially available or prepared according to WO2017140669 and W02018091153) can be converted in STEP 1 to compound 1Y by treatment with trifluoro methanesulfonic anhydride, in solution in DCM, in the presence of pyridine as a base. Compound 1Y can be converted in STEP 2 to compound 1Z by carbonylation with carbon monoxide, in solution in DMF and MeOH, in the presence of a palladium catalyst, for example [l,r-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM. Compound 1Z can be converted in STEP 3 to compound 10 wherein

R3a = C02Me by treatment with trifluoromethanesulfonic anhydride, in solution in DCM, in the presence of pyridine as a base.

SCHEME If: Alternative preparation of compounds of the formula (IB) - General process

Compound 1A Compound 1Aa

Compound 1Ab Compound 1Ac

STEP 4

HCI water

Compound 1B

According to SCHEME If, in which R3a is a hydrogen atom or a carboxylic ester such as COOMe, COOEt, or protected OH such as O-pivaloyl for example, R3’, R3”, R, X and m are defined as described above, compound IB can alternatively be prepared as follows: compound 1A can be converted in STEP 1 to compound lAa by treatment with pyridinium tribromide in DCM or THF at room temperature for example.

Compound lAa can be converted in STEP 2 to compound lAb by deprotonation with a base such as LiHMDS in THF followed by treatment with acetic anhydride. Compound lAc can be prepared in STEP 3 in a Suzuki coupling reaction between compounds lAb and R6B(OR’)2 or ReBFaK using for example [1 J'-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, as catalyst, in a mixture of toluene and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent. Compound 1 Ac can be converted in STEP 4 to compound IB by hydrolysis with aqueous HC1 solution by heating in methanol and DCM for example.

SCHEME 1g: Preparation of compounds of the formula (I) or (I”) - General process

Compound 2B Compound I" According to SCHEME 1g, in which R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, and Rl, R2, R3, R3’, R3”, R4, R5, R6, X, m and n are defined as described above, compound ID can be converted in STEP 1 to compound 2A by treatment with compound 1Z using for example [1,1 '-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (Pd(dppf)Ch), complex with DCM, as catalyst, in a mixture of dioxane and water and in the presence of a base, for example cesium carbonate (CS2CO3), by heating up to reflux of solvent.

Compound 2A can be converted to compound 2B in STEP 2 by treatment with TFA in DCM.

When R3a is -COOMe, -COOEt, or a protected -OH such as O-pivaloyl, deprotection can be performed in STEP 3 by treatment with an aqueous solution of sodium hydroxide (NaOH) 2N or lithium hydroxide (LiOH) in THF or dioxane. When R3 is -COOH, extraction of the product could give the sodium or lithium salt of compound of formula (I) or (I”). The acidification with an aqueous solution of HC1 2N to pH 6-7 could give the neutral form of compound of formula (I) or (I”). The acidification with an aqueous solution of HC1 2N to pH 1-2 could give the hydrochloride salt of compound of formula (I) or (I”). The purification using HPLC in presence of formic acid or trifluoroacetic acid in the eluent could give the formate or trifluoroacetate salt of compound of formula (I) or (I”).

Herein is also provided a process for preparing a compound of formula (I) or (I’) as defined above, wherein a compound of formula IF:

IF wherein Rl, R2, R3’, R3”, R4, R5, R6, m, n, p, X, Y and are as defined above and R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, is converted to compound of formula (I) or (I’), in presence of a source of hydroxide ions, such as NaOH or LiOH in solution in THF or dioxane.

Herein is also provided a process for preparing a compound of formula (I) or (I’) as described above, wherein a compound of formula IF’ :

IF’ wherein Rl, R2, R3, R3’, R3”, R4, R5, R6, m, n, p, X and Y are as described above, and R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl for example, is converted to compound of formula (I) or (I’), in presence of a source of hydroxide ions, such as NaOH or LiOH in solution in THF or dioxane , said step being optionally preceded by a step for obtaining compound IF’, wherein a compound of formula IT:

IT wherein Rl, R2, R3’, R3”, R4, R5, m, n, p, X and Y are as described above, is submitted to a Suzuki coupling with a boronic reagent R6B(OR’)2, wherein -B(OR’)2 is a boronic acid or a pinacolate ester and R6 is defined above. Herein are also provided the intermediates compounds selected from compounds of formula IT, IF, IF’ and 2B, or any of its pharmaceutically acceptable salt, wherein Rl, R2, R3’, R3”, R4, R5, R6, m, n, p, X, Y and '' are as defined above and R3a is a hydrogen atom or a carboxylic ester such as -COOMe, -COOEt, or protected -OH such as O-pivaloyl. Herein is further provided the intermediate compound of formula IE, or any of its pharmaceutically acceptable salt:

IE, wherein Rl, R2, R5, Y, n, p are as described above.

The present application also describes the intermediate compound of formula ID, or any of its pharmaceutically acceptable salt:

ID wherein R3a, R3’, R3”, X, m, R4 and R6 are as described above.

In another aspect, herein is also provided a process for the preparation of a compound of formula (I), wherein R3 is a -COOH group, comprising a deprotection step of a compound of formula IF as defined above, optionally followed by a purification step.

Said purification step may for example consist, as illustrated in step 2 of example 1 herein after, in an acidification step, for example with an aqueous solution of hydrochloric acid.

The ¹ H NMR Spectra at 400 and 500 MHz were performed on a Bruker Avance DRX-400 and Bruker Avance DPX-500 spectrometer, respectively, with the chemical shifts (5 in ppm) in the solvent dimethyl sulfoxide-d6 (d6-DMS0) referenced at 2.5 ppm at a temperature of 303 K. Coupling constants (J) are given in Hertz.

The liquid chromatography /mass spectra (LC/MS) were obtained on a UPLC Acquity Waters instrument, light scattering detector Sedere and SQD Waters mass spectrometer using UV detection DAD 210-400 nm and flash Acquity UPLC CSH C18 1.7 pm, dimension 2.1x30 mm, mobile phase H2O + 0.1% HCO2H / CH3CN + 0.1% HCO2H.

Table la: (the first column Ex corresponds to the compound and example number)

Table lb:

The examples which follow describe the preparation of some compounds of formula (I) described herein. The numbers of the compounds exemplified below match those given in the Tables la and lb above. All reactions are performed under inert atmosphere, unless otherwise stated.

In the following examples, when the source of the starting products is not specified, it should be understood that said products are known compounds. Intermediates:

Intermediate 1: Methyl (S,E)-8-bromo-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylate

Step 1: Methyl 9-(4-hydroxyphenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carbox ylate

To a mixture of methyl 9-(((trifluoromethyl)sulfonyl)oxy)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate (23.8 g, 67.94 mmol) (prepared according to WO20 17140669), (4-hydroxyphenyl)boronic acid (10.85 g, 74.73 mmol) and [l,r-bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with DCM (4.48 g, 6.11 mmol) in dioxane (200 ml) and water (70 ml) was added CS2CO3 (44.32 g, 135.88 mmol). The reaction mixture was stirred for 30 minutes at RT. Water (500 ml) and EtOAc (500 ml) were added. The organic phase was dried over MgSCU, filtered, and concentrated under reduced pressure. The residue was purified by flash chromatography eluting with a mixture of EtOAc and n-heptane (20/80; v/v) to give 17.36 g (87%) of methyl 9-(4- hydroxyphenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate .

LC/MS (m/z, MH+): 295

Step 2: Tert-butyl (S)-3-(4-(3-(methoxycarbonyl)-6,7-dihydro-5H-benzo[7]annulen -9- yl)phenoxy)pyrrolidine- 1 -carboxylate

To a mixture of methyl 9-(4-hydroxyphenyl)-6,7-dihydro-5H-benzo[7]annulene-3- carboxylate (5 g, 17 mmol), tert-butyl (R)-3-hydroxypyrrolidine-l -carboxylate (3.82 g, 20.38 mmol) and N,N,N',N'-tetramethylazodicarboxamide (5.97 g, 33.97 mmol) in THF (100 ml) was added PPI13 (8.91 g, 33.97 mmol). The reaction mixture was stirred at RT for 18 hours. EtOAc (500 ml) and water (250 ml) were added. The organic phase was separated, dried over Na2SO4, filtered and concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM / MeOH (100/00 to 98/02), to give 5.9 g (75%) of tert-butyl (S)-3-(4-(3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)phenoxy)pyrrolidine-l-carbox ylate.

LC/MS (m/z, MH+): 464

Step 3: Methyl (S)-8-bromo-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate

To a solution of tert-butyl (S)-3-(4-(3-(methoxycarbonyl)-6,7-dihydro-5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidine-l-carboxylate (5.9 g, 12.73 mmol) in DCM (340 ml) was added pyridinium tribromide (4.48 g, 14 mmol). The reaction mixture was stirred at RT for 18 hours. A concentrated aqueous solution of NaHCOa was added. After decantation, the organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure. To the residue obtained was added dioxane (100 ml) and HC1 in dioxane 4 N (30.42 ml, 121.67 mmol). After 30 minutes of stirring at RT, the reaction mixture was concentrated under reduced pressure and the residue obtained was purified on strong cation exchange (SCX) column to give 4.95 g (92%) of methyl (S)-8-bromo-9-(4-(pyrrolidin-3- yloxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate

LC/MS (m/z, MH+): 442

Step 4: Methyl (S,E)-8-bromo-9-(4-((l-(4-(tert-butoxy)-4-oxobut-2-en-l-yl)p yrrolidin-3- yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate

A mixture of methyl (S)-8-bromo-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate (2.34 g, 5.29 mmol), DIEA (1.37 g, 10.58 mmol) and tertbutyl (E)-4-bromobut-2-enoate (1.29 g, 5.29 mmol) in THF (40 ml) was stirred at RT for 18 hours. EtOAc (200 ml) and concentrated aqueous solution of NaCl (50 ml) were added. After decantation, the organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM / MeOH (100/00 to 98/02), to give 1.6 g (52%) of methyl (S,E)-8-bromo- 9-(4-((l-(4-(tert-butoxy)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl )oxy)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 582

Step 5: (S,E)-4-(3-(4-(8-Bromo-3-(methoxycarbonyl)-6,7-dihydro-5H-be nzo[7]annulen-9- yl)phenoxy)pyrrolidin- l-yl)but-2-enoic acid To a solution of methyl (S,E)-8-bromo-9-(4-((l-(4-(tert-butoxy)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylate (2.4 g, 4.12 mmol) in DCM (4 ml) was added TFA (3.17 ml, 41.2 mmol). The reaction mixture was stirred at RT for 18 hours. The reaction mixture was concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM / MeOH (100/00 to 90/10), to give 1.5 g (69%) of (S,E)-4-(3-(4-(8-bromo-3- (methoxycarbonyl)-6,7-dihydro-5H-benzo[7]annulen-9-yl)phenox y)pyrrolidin-l-yl)but-2- enoic acid.

LC/MS (m/z, MH+): 526

Step 6: Methyl (S,E)-8-bromo-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl )pyrrolidin-

3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carbox ylate

A mixture of (S,E)-4-(3-(4-(8-bromo-3-(methoxycarbonyl)-6,7-dihydro-5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidin-l-yl)but-2-enoic acid (1.5 g, 2.85 mmol) DMF (10 ml), DIEA (1.1 g, 8.53 mmol) and HATU (1.3 g, 3.42 mmol) was stirred at RT for 10 minutes. Dimethylamine 2M in THF (2.14 ml, 4.27 mmol) was added and the reaction mixture was stirred at RT for 2 hours. EtOAc (50 ml) and water (50 ml) were added. After decantation, the organic phase was dried over MgSCE, filtered, and concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with DCM/acetone 25/75 to give 1.58 g (100%) of methyl (S,E)-8-bromo-9-(4-((l-(4- (dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)pheny l)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 553

Intermediate 2: (E)-4-Bromo-N,N-dimethyl-but-2-enamide

To a mixture of (E)-4-bromobut-2-enoic acid (20 g, 121.23 mmol) in DCM (50 ml) cooled at 0°C were added DIEA (17.24 g, 133.35 mmol) and HBTU (46.71 g, 145.47 mmol). The reaction mixture was stirred for 30 minutes at 0°C. The reaction mixture was cooled at - 10°C, then was added dropwise dimethylamine 2M in THF (75.77 ml, 151.53 mmol). The reaction mixture was stirred at 0°C for 2 hours. DCM (150 ml) and water (150 ml) were added. After decantation, the organic phase was dried over MgSCU, filtered, and concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of heptane/EtOAc from 100/00 to 00/100 to give 9.33 g (40%) of (E)-4-bromo-N,N-dimethyl-but-2-enamide.

LC/MS (m/z, MH+): 192

Intermediate 3: Methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-

2-yl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate

A mixture of methyl 8-(2,4-dichlorophenyl)-9-(((trifluoromethyl)sulfonyl)oxy)-6, 7- dihydro-5H-benzo[7]annulene-3-carboxylate (prepared according to W02020/049153) (15 g, 30.29 mmol) in toluene (300 ml), Pd(PPh3)2Ch (0.87 g, 1.21 mmol), PPI13 (0.64 g, 2.42 mmol), bis(pinacolato)diboron (19.23 g, 75.71 mmol) and PhOK (8.43 g, 60.57 mmol) was heated to 75°C for 24 h. After cooling to RT, EtOAc (300 mL) and water (300 mL) were added. After decantation, the organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of heptane / EtOAc (from 100/00 to 90/10) to give 11.73 g (82%) of methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate as a white solid.

LC/MS (m/z, MH+): 473 Intermediate 4: (E)-4-[3-(4-Bromophenoxy)azetidin- l-yl]-N,N-dimethyl-but-2-enamide

Step 1: Tert-butyl 3-(4-bromophenoxy)azetidine-l -carboxylate A mixture of 4-bromphenol (5 g, 29 mmol), l-boc-3-iodoazetidine (12 g, 43 mmol) and CS2CO3 (19 g, 58 mmol) in DMF (50 ml) was heated at 65°C for 6 hours. After cooling to RT, addition of EtOAc (200 ml) and water (200 ml). After decantation, the organic phase was dried over MgSCU, filtered, and concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM/MeOH from 100/00 to 99/01 to give 9.33 g (98%) of tert-butyl 3-(4-bromophenoxy)azetidine-l- carboxylate.

LC/MS (m/z, MH+): 328

Step 2: 3-(4-Bromophenoxy)azetidine To a solution of tert-butyl 3-(4-bromophenoxy)azetidine-l -carboxylate (5.85 g, 17.8 mmol) in DCM (60 ml) was added dropwise TFA (13.2 ml, 178 mmol). The reaction mixture was stirred at RT for 3 hours. The reaction mixture was concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM/MeOH/NH ₄ OH from 100/00/00 to 38/17/2 to give 3.51 g (83%) of 3-(4- bromophenoxy )azetidine .

LC/MS (m/z, MH+): 228

Step 3: (E)-4-[3-(4-Bromophenoxy)azetidin- l-yl]-N,N-dimethyl-but-2-enamide

A mixture of 3-(4-bromophenoxy)azetidine (151 mg, 0.66 mmol), DIEA (171 mg, 1.32 mmol) and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) (127 mg, 0.66 mmol) in MeCN (4 ml) was stirred at RT for 3 hours. The reaction mixture was concentrated under reduced pressure. To the residue obtained, EtOAc (20 ml) and water (5 ml) were added. After decantation, the organic phase was dried over Na SCC filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM / MeOH (100/00 to 95/05), to give 151 mg (68%) of (E)-4- [3-(4-bromophenoxy)azetidin-l-yl]-N,N-dimethyl-but-2-enamide .

LC/MS (m/z, MH+): 339

Intermediate 5: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)azetidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-be nzo[7]annulene-3- carboxylate

A mixture of methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2- yl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) (116 mg, 0.24 mmol), (E)-4-[3-(4-bromophenoxy)azetidin- l-yl]-N,N-dimethyl-but-2-enamide (Intermediate 4) (75 mg, 0.22 mmol), [1,1'- bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with DCM (21 mg, 0.029 mmol), CS2CO3 (185 mg, 0.57 mmol) in dioxane (4 ml) and water (1 ml) was heated to reflux for 4 hours. The organic phase was dried over MgSCU, filtered, and concentrated under reduced pressure. After cooling to RT, EtOAc (20 ml) and water (5 ml) were added. After decantation, the organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with with a gradient of DCM / MeOH (100/00 to 95/05) to give 41.6 mg (31%) methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en- l-yl)azetidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylate as a yellow solid.

LC/MS (m/z, MH+): 605

Intermediate 6: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)azetidin-3-yl)methyl)phenyl)-6,7-dihydro-5H -benzo[7]annulene-3- carboxylate Step 1: Methyl 9-(4-(azetidin-3-ylmethyl)phenyl)-8-(2,4-dichlorophenyl)-6,7 -dihydro-5H- benzo[7]annulene-3-carboxylate

Step 1 of Intermediate 6 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and 3-[(4- bromophenyl)methyl] azetidine, 4-methylbenzenesulfonic acid to give 350 mg (34%) methyl 9-(4-(azetidin-3-ylmethyl)phenyl)-8-(2,4-dichlorophenyl)-6,7 -dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 492

Step 2: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl) azetidin- 3 -y l)methy l)pheny 1) -6,7 -dihydro -5H-benzo [7 ] annulene- 3 -c arboxy late

A mixture of methyl 9-(4-(azetidin-3-ylmethyl)phenyl)-8-(2,4-dichlorophenyl)-6,7 - dihydro-5H-benzo[7]annulene-3-carboxylate (200 mg, 0.41 mmol), DIEA (68 mg, 0.53 mmol) and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) (78 mg, 0.41 mmol) in DMF (4 ml) was stirred at RT for 3 hours. EtOAc (10 ml), diethyl ether (10 ml) and water (20 ml) were added. After decantation, the organic phase was dried over Na2S(J4, filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of cyclohexane / EtOAc (100/00 to 00/100), then a gradient of EtOAc / MeOH (100/00 to 90/10) and then DCM / MeOH (90/10) to give 110 mg (45%) of methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2- en-l-yl)azetidin-3-yl)methyl)phenyl)-6,7-dihydro-5H-benzo[7] annulene-3-carboxylate.

LC/MS (m/z, MH+): 603

Intermediate 7: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)azetidin-3-ylidene)methyl)phenyl)-6,7-dihyd ro-5H-benzo[7]annulene-3- carboxylate

Step 1: Tert-butyl 3-(4-bromobenzylidene)azetidine-l -carboxylate

Method 1:

To a solution of (4-bromobenzyl)triphenylphosphonium bromide (79.2 g, 155 mmol) in DMF (400 mL) was added NaH (6.18 g, 155 mmol, 60% purity in weight) at 0°C. The mixture was stirred at 0°C for 15 min. To this reaction mixture was added a solution of tertbutyl 3-oxoazetidine-l -carboxylate (24.1 g, 141 mmol) in DMF (160 mL). The reaction mixture was stirred at 20°C for 9 hours. The reaction mixture was quenched by addition of saturated aqueous solution of NH4CI (100 mL) at 0°C. The reaction mixture was filtered and the filtrate was concentrated under reduced pressure to give 60.0 g (crude) of tert-butyl 3- (4-bromobenzy lidene) azetidine- 1 -carboxylate as a yellow solid.

LC/MS (m/z, MH+): 324

Method 2:

A mixture of tert-butyl 3-methyleneazetidine-l -carboxylate (12.5 g, 73.9 mmol), 1-bromo- 4-iodobenzene (23 g, 81.3 mmol), K2CO3 (20.4 g, 148 mmol), tetrabutylammonium bromide (23.8 g, 73.9 mmol) and palladium(II) acetate (1.66 g, 7.39 mmol) in DMF (125 mL) was heated to 60°C for 16 hours. After cooling to RT, EtOAc (500 ml) and water (500 mL) were added. After decantation, the organic phase was washed twice with water (500 ml), dried over MgSCU, filtered, concentrated under reduced pressure and purified by flash chromatography, eluting with DCM to give 20.7 g (86%) of tert-butyl 3-(4-bromobenzylidene)azetidine-l -carboxylate as a beige solid.

LC/MS (m/z, MH+): 324

Step 2: Tert-butyl 3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro -5H- benzo[7]annulen-9-yl)benzylidene)azetidine-l -carboxylate

Step 2 of Intermediate 7 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and tert-butyl 3-(4- bromobenzylidene)azetidine-l -carboxylate to give 1.46 g (80%) of tert-butyl 3-(4-(8-(2,4- dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro-5H-benzo[7]a nnulen-9- yl)benzylidene)azetidine- 1 -carboxylate.

LC/MS (m/z, MH+): 590

Step 3: Methyl 9-(4-(azetidin-3-ylidenemethyl)phenyl)-8-(2,4-dichlorophenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate, 2,2,2-trifluoroacetic acid

Step 3 of Intermediate 7 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl 3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)benzylidene)azetidine-l-carb oxylate to give 1.58 g (crude) of methyl 9-(4-(azetidin-3-ylidenemethyl)phenyl)-8-(2,4-dichlorophenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate, 2,2,2-trifluoroacetic acid which was used as such in the next step.

LC/MS (m/z, MH+): 490

Step 4: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2- en-l-yl)azetidin-3-ylidene)methyl)phenyl)-6,7-dihydro-5H-ben zo[7]annulene-3- carboxylate To a mixture of methyl 9-(4-(azetidin-3-ylidenemethyl)phenyl)-8-(2,4-dichlorophenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate, 2,2,2-trifluoroacetic acid (303 mg, 0.50 mol), (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) (106 mg, 0.55 mmol) in DCM (4 ml) was added NaOH 0.5 N (2 ml, 1.13 mmol). The reaction mixture was stirred at RT for 18 hours. After decantation, the organic phase was purified by flash chromatography using a gradient of EtOAc / MeOH (from 100/00 to 90/10) to give 126 mg (42%) of methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l-yl)azetidin-3- ylidene)methyl)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-car boxylate.

LC/MS (m/z, MH+): 601

Intermediate 8: Methyl (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5 H-benzo[7]annulene-3- carboxylate

Step 1: Tert-butyl (3S)-3-(4-bromoanilino)pyrrolidine-l -carboxylate

A mixture of l-bromo-4-iodo-benzene (5 g, 18 mmol), (S)-l-Boc-3-aminopyrrolidine (6.6 g, 35 mmol), palladium(II) acetate (400 mg, 1.8 mmol), 4,5-bis(diphenylphosphino)-9,9- dimethylxanthene (1.4 g, 2.5 mmol) and CS2CO3 (17 g, 53 mmol) in dioxane (50 ml) was heated at reflux for 5 hours. After cooling to RT, EtOAc (100 ml) and water (100 ml) were added. After decantation, the organic phase was dried over MgSO4, filtered, concentrated under reduced pressure and purified by flash chromatography, eluting with a gradient of cyclohexane / EtOAc (from 88/12 to 00/100) to give 5 g (82%) of tert-butyl (3S)-3-(4- bromoanilino)pyrrolidine- 1 -carboxylate. LC/MS (m/z, MH+): 341

Step 2: Tert-butyl (S)-3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-di hydro-5H- benzo[7]annulen-9-yl)phenyl)amino)pyrrolidine-l -carboxylate

Step 2 of Intermediate 8 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and tert-butyl (3S)-3-(4- bromoanilino)pyrrolidine- 1 -carboxylate to give 98 mg (11%) of tert-butyl (S)-3-((4-(8-(2,4- dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro-5H-benzo[7]a nnulen-9- yl)phenyl)amino)pyrrolidine-l -carboxylate.

LC/MS (m/z, MH+): 607

Step 3: Methyl (S)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylamino)phenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate

Step 3 of Intermediate 8 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl (S)-3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)phenyl)amino)pyrrolidine-l-c arboxylate to give 49 mg (43%) of methyl (S)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylamino)phenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 507

Step 4: Methyl (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en- l-yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]an nulene-3-carboxylate

Step 4 of Intermediate 8 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl (S)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylamino)phenyl )- 6,7-dihydro-5H-benzo[7]annulene-3-carboxylate and (E)-4-bromo-N,N-dimethyl-but-2- enamide (Intermediate 2) to give 39 mg (72%) of methyl (S,E)-8-(2,4-dichlorophenyl)-9-(4- ((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl)am ino)phenyl)-6,7-dihydro- 5H-benzo [7 ] annulene- 3 -carboxy late .

LC/MS (m/z, MH+): 618

Intermediate 9: Methyl (R,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3- carboxylate

Step 1: Tert-butyl (3R)-3-(4-bromophenoxy)pyrrolidine-l-carboxylate

Step 1 of Intermediate 9 was prepared following a similar procedure to that of Step 2 of Intermediate 1 from 4-bromophenol and tert-butyl (3S)-3-hydroxypyrrolidine-l -carboxylate to give 9.26 g (93%) of tert-butyl (3R)-3-(4-bromophenoxy)pyrrolidine-l -carboxylate. LC/MS (m/z, MH+): 342

Step 2: Tert-butyl (R)-3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dih ydro-5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidine-l-carboxylate Step 2 of Intermediate 9 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and tert-butyl (3R)-3-(4- bromophenoxy)pyrrolidine- 1 -carboxylate to give 321 mg (36%) of tert-butyl (R)-3-(4-(8- (2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro-5H-benz o[7]annulen-9- yl)phenoxy)pyrrolidine- 1 -carboxylate.

LC/MS (m/z, MH+): 608

Step 3: Methyl (R)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-yloxy)phenyl)- 6,7-dihydro-

5H-benzo[7]annulene-3-carboxylate

Step 3 of Intermediate 9 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl (R)-3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)phenoxy)pyrrolidine-l-carbox ylate to give 220 mg (85%) of methyl (R)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-yloxy)phenyl)- 6,7-dihydro- 5H-benzo [7 ] annulene- 3 -carboxy late .

LC/MS (m/z, MH+): 508

Step 4: Methyl (R,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en- l-yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annu lene-3-carboxylate

Step 4 of Intermediate 9 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl (R)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-yloxy)phenyl)- 6,7-dihydro-5H-benzo[7]annulene-3-carboxylate and (E)-4-bromo-N,N-dimethyl-but-2- enamide (Intermediate 2) to give 113 mg (43%) of methyl (R,E)-8-(2,4-dichlorophenyl)-9- (4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl )oxy)phenyl)-6,7-dihydro- 5H-benzo [7 ] annulene- 3 -carboxy late .

LC/MS (m/z, MH+): 619

Intermediate 10: Methyl 8-(2,4-dichlorophenyl)-9-(4-((Z)-(l-((E)-4-(dimethylamino)-4 - oxobut-2-en-l-yl)pyrrolidin-3-ylidene)methyl)phenyl)-6,7-dih ydro-5H-benzo[7]annulene- 3-carboxylate

Step 1: Tert-butyl 3- [(4-bromophenyl)-hydroxy-methyl]pyrrolidine-l -carboxylate

To a mixture of commercially available tert-butyl 3-(4-bromobenzoyl)pyrrolidine-l- carboxylate (5.82 g, 16.44 mmol) in MeOH (180ml) was added NaBH4 (1.866 g, 49.33 mmol) and the mixture was stirred at RT for 2 hrs. A concentrated aqueous solution of NH4CI (100 ml) and EtOAc (300 ml) were added. After decantation, the organic phase was washed with brine (200 ml), dried over Na2SO4 filtered and concentrated under reduced pressure to give 5.8 g (crude) of tert-butyl 3-[(4-bromophenyl)-hydroxy-methyl]pyrrolidine-l- carboxylate.

LC/MS (m/z, MH+): 356

Step 2: (3Z)-3-[(4-bromophenyl)methylene]pyrrolidine

To a mixture of tert-butyl 3- [(4-bromophenyl)-hydroxy-methyl]pyrrolidine-l -carboxylate (5.8 g, 16.29 mmol) and water (12 ml) at 0°C was dropwise added sulfuric acid (42 ml). The cooling bath was removed, and the reaction mixture was stirred for 1 hour at RT. The reaction mixture was poured into a mixture of ice and water (500 ml). Powder NaHCOa was added to pH 9 followed by EtOAc (300 ml) and the organic phase was separated and dried over Na2SO4, filtered, concentrated under reduced pressure to give 1.97 g (51%) 3-[(4- bromophenyl)methylene]pyrrolidine as a mixture of (Z) and (E) isomers.

The mixture of (Z) and (E) isomers of 3-[(4-bromophenyl)methylene]-l-(3- fluoropropyl)pyrrolidine was separated on column Chiralcel OZ 20 pm (0.46x25cm), eluting with heptane/EtOH/TEA (95/5/0.1) to give 641 mg of (Z) isomer (3Z)-3-[(4- bromophenyl)methylene]pyrrolidine and 953 mg of (E) isomer (3E)-3-[(4- bromopheny l)methy lene] pyrrolidine .

LC/MS (m/z, MH+): 238

Step 3: Methyl (Z)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylidenemethyl) phenyl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate

Step 3 of Intermediate 10 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and (3Z)-3-[(4- bromophenyl)methylene]pyrrolidine to give 97 mg (30%) of methyl (Z)-8-(2,4- dichlorophenyl)-9-(4-(pyrrolidin-3-ylidenemethyl)phenyl)-6,7 -dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 504

Step 4: Methyl 8-(2,4-dichlorophenyl)-9-(4-((Z)-(l-((E)-4-(dimethylamino)-4 -oxobut-2- en-l-yl)pyrrolidin-3-ylidene)methyl)phenyl)-6,7-dihydro-5H-b enzo[7]annulene-3- carboxylate

Step 4 of Intermediate 10 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl (Z)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3- ylidenemethyl)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carb oxylate and (E)-4-bromo- N,N-dimethyl-but-2-enamide (Intermediate 2) to give 106 mg (49%) of methyl 8-(2,4- dichlorophenyl)-9-(4-((Z)-(l-((E)-4-(dimethylamino)-4-oxobut -2-en-l-yl)pyrrolidin-3- ylidene)methyl)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-car boxylate.

LC/MS (m/z, MH+): 615 Intermediate 11: Methyl 8-(2,4-dichlorophenyl)-9-(4-((Z)-(l-((E)-4-(dimethylamino)-4 - oxobut-2-en-l-yl)pyrrolidin-3-ylidene)methyl)phenyl)-6,7-dih ydro-5H-benzo[7]annulene- 3-carboxylate

Step 1: (E)-4-[2-(4-Bromophenoxy)ethylamino]-N,N-dimethyl-but-2-enam ide

Step 1 of Intermediate 11 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from 2-(4-bromophenoxy)ethanamine, hydrochloride and (E)-4-bromo-N,N- dimethyl-but-2-enamide (Intermediate 2) to give 327 mg (36%) of (E)-4-[2-(4- bromophenoxy)ethylamino]-N,N-dimethyl-but-2-enamide.

LC/MS (m/z, MH+): 327

Step 2: Tert-butyl N-[2-(4-bromophenoxy)ethyl]-N-[(E)-4-(dimethylamino)-4-oxo-b ut-2- enyl]carbamate

To a mixture of (E)-4-[2-(4-bromophenoxy)ethylamino]-N,N-dimethyl-but-2-enam ide (460 mg, 1.40 mmol) and DIEA (0.48 ml, 2.81 mmol) in DCM (5 ml) cooled at 0°C was added di-tert-butyl dicarbonate (368 mg, 1.69 mmol). The cooling bath was removed and the reaction mixture was stirred for 5 hours at RT. Water (5 ml) and DCM (10 ml) were added. After decantation, the organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography eluting with a gradient of DCM/MeOH from 100/00 to 98/02 to give 414 mg (69%) tert-butyl N-[2-(4- bromophenoxy)ethyl]-N-[(E)-4-(dimethylamino)-4-oxo-but-2-eny l]carbamate.

LC/MS (m/z, MH+): 427

Step 3: Methyl (E)-9-(4-(2-((tert-butoxycarbonyl)(4-(dimethylamino)-4-oxobu t-2-en-l- yl)amino)ethoxy)phenyl)-8-(2,4-dichlorophenyl)-6,7-dihydro-5 H-benzo[7]annulene-3- carboxylate

Step 3 of Intermediate 11 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and tert-butyl N-[2-(4- bromophenoxy)ethyl]-N-[(E)-4-(dimethylamino)-4-oxo-but-2-eny l]carbamate to give 261 mg (39%) of methyl (E)-9-(4-(2-((tert-butoxycarbonyl)(4-(dimethylamino)-4-oxobu t-2-en- l-yl)amino)ethoxy)phenyl)-8-(2,4-dichlorophenyl)-6,7-dihydro -5H-benzo[7]annulene-3- carboxylate.

LC/MS (m/z, MH+): 693

Step 4: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-(2-((4-(dimethylamino)-4-oxo but-2-en-l- yl)amino)ethoxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-ca rboxylate

Step 4 of Intermediate 11 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from methyl (E)-9-(4-(2-((tert-butoxycarbonyl)(4-(dimethylamino)-4- oxobut-2-en-l-yl)amino)ethoxy)phenyl)-8-(2,4-dichlorophenyl) -6,7-dihydro-5H- benzo[7]annulene-3-carboxylate to give 114 mg (52%) of methyl (E)-8-(2,4- dichlorophenyl)-9-(4-(2-((4-(dimethylamino)-4-oxobut-2-en-l- yl)amino)ethoxy)phenyl)- 6,7-dihydro-5H-benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 593 Intermediate 12: Methyl 8-(2,4-dichlorophenyl)-9-(4-

(((trifluoromethyl)sulfonyl)oxy)phenyl)-6,7-dihydro-5H-be nzo[7]annulene-3-carboxylate

Step 1: Methyl 8-(2,4-dichlorophenyl)-9-(4-hydroxyphenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate

To a mixture of methyl 8-(2,4-dichlorophenyl)-9-(((trifluoromethyl)sulfonyl)oxy)-6, 7- dihydro-5H-benzo[7]annulene-3-carboxylate (prepared according to W02020/049153) (5 g, 10 mmol), 4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)phenol (2.7 g, 12 mmol mmol) and [l,T-bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with DCM (0.74 g, 1 mmol) in dioxane (40 ml) and water (10 ml) was added CS2CO3 (6.6 g, 20 mmol). The reaction mixture was heated to reflux for 24 hours. Water (100 ml) and EtOAc (200 ml) were added. The organic phase was dried over MgSCU, filtered, and concentrated under reduced pressure. The residue was purified by flash chromatography eluting with a gradient of cyclohexane/EtOAc (from 89/11 to 00/100) to give 3.8 g (87%) of methyl 8-(2,4- dichlorophenyl)-9-(4-hydroxyphenyl)-6,7-dihydro-5H-benzo[7]a nnulene-3-carboxylate.

LC/MS (m/z, MH+): 439

Step 2: Methyl 8-(2,4-dichlorophenyl)-9-(4-(((trifluoromethyl)sulfonyl)oxy) phenyl)-6,7- dmydro-5H-benzo[7]annulene-3-carboxylate

To a mixture of methyl 8-(2,4-dichlorophenyl)-9-(4-hydroxyphenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate (2 g, 4.6 mmol) in DCM (20 ml) cooled at 0°C were added pyridine (0.65 ml, 8.2 mmol) and trifluoromethanesulfonic anhydride (2.3 g, 8.1 mmol). The reaction mixture was stirred at 0°C for 15 minutes and RT for 2 hours. DCM (50 ml) and water (20 ml) were added. After decantation, the organic phase was dried over MgSCU, filtered, concentrated under reduced pressure, and purified by flash chromatography, eluting with a gradient of cyclohexane / EtOAc (from 86/14 to 90/10) to give 2.31 g (89%) of methyl 8-(2,4-dichlorophenyl)-9-(4-(((trifluoromethyl)sulfonyl)oxy) phenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 571

Intermediate 13: Methyl (R,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5 H-benzo[7]annulene-3- carboxylate

Step 1: Tert-butyl (R)-3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-di hydro-

5H-benzo[7]annulen-9-yl)phenyl)amino)pyrrolidine-l-carbox ylate

A mixture of methyl 8-(2,4-dichlorophenyl)-9-(4-(((trifluoromethyl)sulfonyl)oxy) phenyl)- 6,7-dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 12) (0.715 g, 1.25 mmol), (R)-l-Boc-3-aminopyrrolidine (0.589 g, 3.16 mmol), palladium(II) acetate (28 mg, 0.125 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (101 mg, 0.175 mmol) and CS2CO3 (1.22 g, 3.75 mmol) in dioxane (10 ml) was heated to reflux for 5 hours. After cooling to RT, EtOAc (50 ml) and water (50 ml) were added. After decantation, the organic phase was dried over MgSCU, filtered, concentrated under reduced pressure and purified by flash chromatography, eluting with a gradient of cyclohexane / EtOAc (from 87/13 to 00/100) to give 207 mg (19%) of tert-butyl (R)-3-((4-(8-(2,4-dichlorophenyl)-3- (methoxycarbonyl)-6,7-dihydro-5H-benzo[7]annulen-9-yl)phenyl )amino)pyrrolidine-l- carboxylate.

LC/MS (m/z, MH+): 607

Step 2: Methyl (R)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylamino)phenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate

Step 2 of Intermediate 13 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl (R)-3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)phenyl)amino)pyrrolidine-l-c arboxylate to give 136 mg (82%) of methyl (R)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylamino)phenyl )-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 507

Step 3: Methyl (R,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en- l-yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]an nulene-3-carboxylate

Step 3 of Intermediate 13 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl (R)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3- ylamino)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylat e and (E)-4-bromo-N,N- dimethyl-but-2-enamide (Intermediate 2) to give 80 mg (51%) of methyl (R,E)-8-(2,4- dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l- yl)pyrrolidin-3- yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxyla te.

LC/MS (m/z, MH+): 618

Intermediate 14: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)azetidin-3-yl)amino)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3- carboxylate Step 1: Tert-butyl 3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydr o-5H- benzo[7]annulen-9-yl)phenyl)amino)azetidine-l-carboxylate

Step 1 of Intermediate 14 was prepared following a similar procedure to that of Step 1 of Intermediate 13 from methyl 8-(2,4-dichlorophenyl)-9-(4- (((trifluoromethyl)sulfonyl)oxy)phenyl)-6,7-dihydro-5H-benzo [7]annulene-3-carboxylate (Intermediate 12) and tert-butyl 3-aminoazetidine-l -carboxylate to give 372 mg (60%) of 1- tert-butyl 3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydr o-5H- benzo[7]annulen-9-yl)phenyl)amino)azetidine-l-carboxylate. LC/MS (m/z, MH+): 594

Step 2: Methyl 9-(4-(azetidin-3-ylamino)phenyl)-8-(2,4-dichlorophenyl)-6,7- dihydro-5H- benzo[7]annulene-3-carboxylate Step 2 of Intermediate 14 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl 3-((4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)phenyl)amino)azetidine-l-car boxylate to give 226 mg (74%) of methyl 9-(4-(azetidin-3-ylamino)phenyl)-8-(2,4-dichlorophenyl)-6,7- dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 494

Step 3: Methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)azetidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylate

Step 3 of Intermediate 14 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl 9-(4-(azetidin-3-ylamino)phenyl)-8-(2,4-dichlorophenyl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate and (E)-4-bromo-N,N-dimethyl-but-2- enamide (Intermediate 2) to give 107 mg (39%) of methyl (E)-8-(2,4-dichlorophenyl)-9-(4- ((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)azetidin-3-yl)amin o)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3-carboxylate.

LC/MS (m/z, MH+): 604

Intermediate 15: methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)methyl)phenyl)-6,7-dihydro- 5H-benzo[7]annulene-3- carboxylate , Isomer 1 Step 1: Tert-butyl 3- [(4-bromophenyl)methyl]pyrrolidine-l -carboxylate Isomer 1 and

Isomer 2

To a solution of commercially available 3-[(4-bromophenyl)methyl]pyrrolidine (35.0 g, 145 mmol) and TEA (29.5 g, 292 mmol) in DCM (250 ml) was added DMAP (1.78 g, 14.57 mmol) and BOC2O (33.4 g, 153 mmol) at RT and the suspension was stirred at RT for 12 hours. The reaction mixture was quenched by addition of water (300 ml) and extracted with DCM (100 ml). The organic phase was washed with brine (200 ml), dried over Na2SO4 filtered and concentrated under reduced pressure and the residue obtained was purified by flash chromatography, eluting with a gradient of petroleum ether / ethyl acetate: from 98/02 to 50/50 to give 37 g (73%) of racemic tert-butyl 3-[(4-bromophenyl)methyl]pyrrolidine-l- carboxylate as a light yellow oil.

The racemic tert-butyl 3- [(4-bromophenyl)methyl]pyrrolidine-l -carboxylate (37 g, 107 mmol) was separated by preparative SFC (column: DAICEL CHIRALCEL OJ (250x50mm, 10pm); CO2 mobile phase with 20% of a solution of 0.1% NH4OH in EtOH) to give 17 g of tert-butyl 3 -[(4-bromophenyl)methyl]pyrrolidine-l -carboxylate Isomer 1 and 17 g of tert-butyl 3- [(4-bromophenyl)methyl]pyrrolidine-l -carboxylate Isomer 2.

LC/MS (m/z, MH+): 340

Step 2: tert-butyl 3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro -5H- benzo[7]annulen-9-yl)benzyl)pyrrolidine-l-carboxylate , Isomer 1 Step 2 of Intermediate 15 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and tert-butyl 3-(4- bromobenzyl)pyrrolidine- 1 -carboxylate, Isomer 1 to give 470 mg (53%) of tert-butyl 3-(4- (8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro-5H-b enzo[7]annulen-9- yl)benzyl)pyrrolidine- 1 -carboxylate , Isomer 1.

LC/MS (m/z, MH+): 606

Step 3: methyl 8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylmethyl)phenyl)-6 ,7-dihydro-

5H-benzo[7]annulene-3-carboxylate , Isomer 1

Step 3 of Intermediate 15 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl 3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)benzyl)pyrrolidine-l-carboxy late , Isomer 1 to give 341 mg (87%) of methyl 8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylmethyl)phenyl)-6 ,7- dihydro-5H-benzo[7]annulene-3-carboxylate , Isomer 1.

LC/MS (m/z, MH+): 506

Step 4: methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)pyrrolidin-3-yl)methyl)phenyl)-6,7-dihydro-5H-benzo[7]ann ulene-3-carboxylate , Isomer 1 Step 4 of Intermediate 15 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl 8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylmethyl)phenyl)- 6,7-dihydro-5H-benzo[7]annulene-3-carboxylate, Isomer 1 and (E)-4-bromo-N,N-dimethyl- but-2-enamide (Intermediate 2) to give 229 mg (56%) of methyl (E)-8-(2,4-dichlorophenyl)- 9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3- yl)methyl)phenyl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate , Isomer 1.

LC/MS (m/z, MH+): 617

Intermediate 16: methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)methyl)phenyl)-6,7-dihydro- 5H-benzo[7]annulene-3- carboxylate , Isomer 2

Step 1: tert-butyl 3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro -5H- benzo[7]annulen-9-yl)benzyl)pyrrolidine-l-carboxylate , Isomer 2

Step 1 of Intermediate 16 was prepared following a similar procedure to that of Intermediate 5 from methyl 8-(2,4-dichlorophenyl)-9-(4,4,5,5-tetramethyl-l,3,2-dioxabor olan-2-yl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate (Intermediate 3) and tert-butyl 3-(4- bromobenzyl)pyrrolidine- 1 -carboxylate, Isomer 2 to give 390 mg (44%) of tert-butyl 3-(4- (8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7-dihydro-5H-b enzo[7]annulen-9- yl)benzyl)pyrrolidine- 1 -carboxylate , Isomer 2.

LC/MS (m/z, MH+): 606 Step 2: methyl 8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylmethyl)phenyl)-6 ,7-dihydro-

5H-benzo[7]annulene-3-carboxylate , Isomer 2

Step 3 of Intermediate 16 was prepared following a similar procedure to that of Step 2 of Intermediate 4 from tert-butyl 3-(4-(8-(2,4-dichlorophenyl)-3-(methoxycarbonyl)-6,7- dihydro-5H-benzo[7]annulen-9-yl)benzyl)pyrrolidine-l-carboxy late , Isomer 2 to give 320 mg (98%) of methyl 8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylmethyl)phenyl)-6 ,7- dihydro-5H-benzo[7]annulene-3-carboxylate , Isomer 2.

LC/MS (m/z, MH+): 506

Step 3: methyl (E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxo but-2-en-l- yl)pyrrolidin-3-yl)methyl)phenyl)-6,7-dihydro-5H-benzo[7]ann ulene-3-carboxylate , Isomer 2

Step 3 of Intermediate 16 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl 8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-ylmethyl)phenyl)- 6,7-dihydro-5H-benzo[7]annulene-3-carboxylate, Isomer 2 and (E)-4-bromo-N,N-dimethyl- but-2-enamide (Intermediate 2) to give 23 mg (53%) of methyl (E)-8-(2,4-dichlorophenyl)- 9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3- yl)methyl)phenyl)-6,7- dihydro-5H-benzo[7]annulene-3-carboxylate , Isomer 2.

LC/MS (m/z, MH+): 617 Intermediate 17: Methyl (S,E)-4-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)phenyl)-2,3-dihydrobenz o[b]oxepine-8-carboxylate

Step 1: 5-Oxo-2,3,4,5-tetrahydrobenzo[b]oxepine-8-yl trifluoromethanesulfonate

To a mixture of 8-hydroxy-3,4-dihydrobenzo[b]oxepine-5(2H)-one (4.2 g, 23.57 mmol) (prepared according to W02018091153) and pyridine (2.82 g, 2.89 ml, 35.36 mmol) in DCM (120 ml) cooled at -20°C was dropwise added trifluoromethanesulfonic anhydride (8.14 g, 6 ml, 28.28 mmol). The reaction mixture was stirred at 0°C for 30 minutes. Water (50 ml) was added. The organic phase was separated and washed with an aqueous saturated solution of NaHCOa (50 ml). The organic phase was dried over MgSCU, filtered, and concentrated under reduced pressure to give 7.30 g (100%) of 5-oxo-2, 3,4,5- tetrahy drobenzo [b] oxepine- 8 -y 1 trifluoromethane sulfonate .

LC/MS (m/z, MH+): 311

Step 2: Methyl 5-oxo-2,3,4,5-tetrahydrobenzo[b]oxepine-8-carboxylate

To a solution of compound 5-oxo-2,3,4,5-tetrahydrobenzo[b]oxepine-8-yl trifluoromethanesulfonate (7.4 g, 23.85 mmol) in DMF (30 ml) and MeOH (15 ml) was added DIEA (3.15 g, 4.16 ml, 23.85 mmol) and Pd(dppf)Ch complex with DCM (1.10 g, 1.43 mmol), the suspension was degassed and purged three times with CO. The mixture was stirred under CO (5 bars) at 75 °C for 2 hours. The reaction was filtered through celite. The filtrate was diluted with water (400 ml) and extracted three times with EtOAc (300 ml). The combined organic phases were dried over Na2SO4, filtered, concentrated under reduced pressure, and the residue obtained was purified by flash chromatography eluting with a gradient of heptane/ethyl acetate: from 85/15 to 80/20 to give 4.6 g (88%) methyl 5-oxo- 2,3,4,5-tetrahydrobenzo[b]oxepine-8-carboxylate.

LC/MS (m/z, MH+): 221

Step 3: Methyl 4-(2,4-dichlorophenyl)-5-oxo-2,3,4,5-tetrahydrobenzo[b]oxepi ne-8- carboxylate

A mixture of l-bromo-2,4-difluoro-benzene (4.21 g, 18.1 mmol), methyl 5-oxo-2, 3,4,5- tetrahydrobenzo[b]oxepine-8-carboxylate (2 g, 9.1 mmol), CS2CO3 (11.92 g, 36.58 mmol) in toluene (12 ml). After addition of XANTPHOS (1.1 g, 1.8 mmol) and Pd2(dba)3 (0.83 g, 0.91 mmol), the reaction mixture was heated to reflux for 18 hours. After cooling to RT, water (250 ml) and DCM (20 ml) were added. After decantation, the organic phase was dried over MgSO4, filtered and concentrated under reduced pressure. The residue obtained was purified by flash chromatography, eluting with a gradient of Heptane/EtOAc from 100/00 to 90/10 to give 1.85 g (56%) of methyl 4-(2, 4-dichlorophenyl)-5-oxo-2, 3,4,5- tetrahy drobenzo [b] oxepine- 8 -c arboxy late .

LC/MS (m/z, MH+): 365

Step 4: Methyl 4-(2,4-dichlorophenyl)-5-(((trifluoromethyl)sulfonyl)oxy)-2, 3- dihydrobenzo[b]oxepine-8-carboxylate

To a suspension of NaH (361 mg, 9.04 mmol, 60% purity in wheight) in Me-THF (17 ml) cooled at -2°C was added DBU (183 mg, 0.18 ml, 1.21 mmol) followed by a solution of methyl 4-(2,4-dichlorophenyl)-5-oxo-2,3,4,5-tetrahydrobenzo[b]oxepi ne-8-carboxylate (2.2 g, 6.02 mmol) and N,N-bis(trifluoromethylsulfonyl)aniline (2.80 g, 7.83 mmol) in THF (15 ml). The cooling bath was removed to allow the temperature to warm up to RT. The reaction mixture was stirred at RT for 4 hours. A mixture of acetic acid (0.14 ml) and water (20 ml) was drop wise added, followed by water (60 ml) and EtOAc (60 ml). After decantation, the organic phase was dried over MgSCU, filtered and concentrated under reduced pressure. The residue obtained was purified by flash chromatography, eluting with DCM/heptane 70/30 to give 1.31 g (44%) of methyl 4-(2,4-dichlorophenyl)-5-(((trifluoromethyl)sulfonyl)oxy)-2, 3- dihy drobenzo [b ] oxepine- 8 -carboxylate .

LC/MS (m/z, MH+): 496

Step 5: Methyl (S)-4-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 2,3- dihydrobenzo[b]oxepine-8-carboxylate

Step 5 of Intermediate 17 was prepared following a similar procedure to that of Step 1 of Intermediate 12 from methyl 4-(2,4-dichlorophenyl)-5-(((trifluoromethyl)sulfonyl)oxy)- 2,3-dihydrobenzo[b]oxepine-8-carboxylate and (3S)-3-[4-(4, 4,5, 5-tetramethyl- 1,3,2- dioxaborolan-2-yl)phenoxy]pyrrolidine (prepared according to WO2017140669) to give 530 mg (67%) of methyl (S)-4-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 2,3- dihy drobenzo [b ] oxepine- 8 -carboxylate .

LC/MS (m/z, MH+): 510

Step 6: Methyl (S,E)-4-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4-o xobut-2-en- l-yl)pyrrolidin-3-yl)oxy)phenyl)-2,3-dihydrobenzo[b]oxepine- 8-carboxylate

Step 6 of Intermediate 17 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl (S)-4-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 2,3-dihydrobenzo[b]oxepine-8-carboxylate and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) to give 423 mg (66%) of (S,E)-4-(2,4-dichlorophenyl)-5-(4-((l-(4- (dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)pheny l)-2,3- dihy drobenzo [b ] oxepine- 8 -carboxylate .

LC/MS (m/z, MH+): 621 Intermediate 18: Methyl (S,E)-6-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)phenyl)-7,8-dihydronaph thalene-2-carboxylate

Step 1: Methyl 2-(2,4-dichlorophenyl)-l-oxo-tetralin-6-carboxylate Step 1 of Intermediate 18 was prepared following a similar procedure to that of step 3 of Intermediate 17 from methyl l-oxotetralin-6-carboxylate to give 459 mg (19%) of methyl 4- (2, 4-dichlorophenyl) -5-oxo-2,3 ,4, 5-tetrahy drobenzo [b]oxepine- 8-carboxylate .

LC/MS (m/z, MH+): 349 Step 2: Methyl 6-(2,4-dichlorophenyl)-5-(trifluoromethylsulfonyloxy)-7,8- dihydronaphthalene-2-carboxylate

Step 2 of Intermediate 18 was prepared following a similar procedure to that of step 4 of Intermediate 17 from methyl 2-(2,4-dichlorophenyl)-l-oxo-tetralin-6-carboxylate to give 0.48 g (31%) of methyl 6-(2,4-dichlorophenyl)-5-(trifluoromethylsulfonyloxy)-7,8- dihydronaphthalene-2-carboxylate.

LC/MS (m/z, MH+): 481

Step 3: Methyl (S)-6-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 7,8- dihydronaphthalene-2-carboxylate

Step 3 of Intermediate 18 was prepared following a similar procedure to that of Step 1 of Intermediate 12 from methyl 6-(2,4-dichlorophenyl)-5-(trifluoromethylsulfonyloxy)-7,8- dihydronaphthalene-2-carboxylate and (3S)-3-[4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan- 2-yl)phenoxy]pyrrolidine (prepared according to WO2017140669) to give 290 mg (45%) of methyl (S)-6-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 7,8- dihydronaphthalene-2-carboxylate.

LC/MS (m/z, MH+): 494 Step 4: Methyl (S,E)-6-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4-o xobut-2-en- l-yl)pyrrolidin-3-yl)oxy)phenyl)-7,8-dihydronaphthalene-2-ca rboxylate

Step 4 of Intermediate 18 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from methyl (S)-6-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 7,8-dihydronaphthalene-2-carboxylate and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) to give 127 mg (36%) of methyl (S,E)-6-(2,4-dichlorophenyl)-5-(4-((l-(4- (dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)pheny l)-7,8-dihydronaphthalene-

2-carboxylate.

LC/MS (m/z, MH+): 605

Method A

Example 1:

(S,E)-8-(2,4-Dichlorophenyl)-9-(4-((l-(4-(dimethylamino)- 4-oxobut-2-en-l-yl)pyrrolidin-

3 -y l)oxy )pheny 1) -6,7 -dihydro- 5H-benzo [7 ] annulene- 3 -c arboxy lie acid

Step 1: Methyl (R)-8-(2,4-dichlorophenyl)-9-(3-((l-(3-fluoropropyl)pyrrolid in-3- yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate

A mixture of methyl (S,E)-8-bromo-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylate (Intermediate 1) (250 mg, 0.45 mmol), 2,4-dichlorophenylboronic acid (103 mg, 0.54 mmol), CS2CO3 (309 mg, 0.95 mmol), Pd(dppf)Ch complex with DCM (33 mg, 45.17 pmol), in dioxane (3.36 ml) and water (0.84 ml) was heated to 100°C under microwaved irradiation for 30 minutes. After cooling to RT, DCM (10 ml) and water (2 ml) were added. After decantation, the organic phase was dried over Na2SO4 filtered and concentrated under reduced pressure and the residue obtained was purified by flash chromatography, eluting with a gradient of DCM/acetone from 75/25 to 50/50 to give 119 mg (43%) methyl (S,E)-8- (2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2- en-l-yl)pyrrolidin-3- yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylate .

LC/MS (m/z, MH+): 619

Step 2: (S,E)-8-(2,4-Dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule ne-3-carboxylic acid

To a mixture of methyl (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H- benzo[7]annulene-3- carboxylate (115 mg, 0.186 mmol) in dioxane (2 ml) and water (2 ml) was added LiOH (12 mg, 0.50 mmol) and the reaction mixture was stirred at RT for 18 hours. DCM (5 ml) and HC1 IN were added till pH 7. After decantation, the organic phase was dried over Na2SO4 filtered and concentrated under reduced pressure to give 73 mg (65%) of (S,E)-8-(2,4- dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-oxobut-2-en-l- yl)pyrrolidin-3- yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annulene-3-carboxylic acid.

Method B

Example 16: (S,E)-8-(2,4-Dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annu lene-3-carboxylic acid

To a mixture of methyl (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4- oxobut-2-en-l-yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5 H-benzo[7]annulene-3- carboxylate (Intermediate 8) (35 mg, 0.057 mmol) in dioxane (0.3 ml) was added LiOH IN (0.15 ml, 0.15 mmol) and the reaction mixture was stirred at RT for 5 hours. DCM (5 ml) and a saturated solution of NH4C1 (5 ml) were added. After decantation, the organic phase was dried over Na2SO4 filtered and concentrated under reduced pressure to give 21 mg (61%) of (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)amino)phenyl)-6,7-dihydro-5H-benzo[7]annu lene-3-carboxylic acid.

Method C

Example 23: (S,E)-4-(3-(4-(8-(2,4-Dichlorophenyl)-3-hydroxy-6,7-dihydro- 5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbu t-2-enamide

Step 1: (S)-9-(4-(Pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H-benzo[7] annulen-3-yl pivalate

Step 1 of Example 23 was prepared following a similar procedure to that of Step 1 of Intermediate 12 from 9-(((trifluoromethyl)sulfonyl)oxy)-6,7-dihydro-5H-benzo[7]an nulen- 3-yl pivalate (prepared according to WO2017140669) and (3S)-3-[4-(4,4,5,5-tetramethyl- 1 ,3,2-dioxaborol an-2-y I) phenoxy | pyrrolidine (prepared according to WO2017140669) to give 640 mg (65%) of (S)-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H- benzo[7]annulen-3-yl pivalate.

LC/MS (m/z, MH+): 406

Step 2: (S)-8-Bromo-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H- benzo[7]annulen- 3-yl pivalate To a solution of (S)-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H-benzo[7] annulen-3- yl pivalate (640 mg, 1.58 mmol) in DCM (20 ml) was added pyridinium tribromide (656 mg, 2.05 mmol). The reaction mixture was stirred at RT for 2 hours. A concentrated aqueous solution of NaHCOa was added. After decantation, the organic phase was dried over Na2SO4, filtered, concentrated under reduced pressure and the residue obtained was purified by flash chromatography, eluting with a gradient of DCM/MeOH from 95/05 to 90/10 to give 550 mg (72%) of (S)-8-bromo-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H- benzo[7]annulen-3-yl pivalate.

LC/MS (m/z, MH+): 484

Step 3: (S)-8-(2,4-Dichlorophenyl)-9-(4-(pyrrolidin-3-yloxy)phenyl)- 6,7-dihydro-5H- benzo[7]annulen-3-yl pivalate

Step 3 of Example 23 was prepared following a similar procedure to that of Step 1 of Example 1 from (S)-8-bromo-9-(4-(pyrrolidin-3-yloxy)phenyl)-6,7-dihydro-5H- benzo[7]annulen-3-yl pivalate and 2,4-dichlorophenylboronic acid to give 200 mg (32%) of (S)-8-(2,4-dichlorophenyl)-9-(4-(pyrrolidin-3-yloxy)phenyl)- 6,7-dihydro-5H- benzo[7]annulen-3-yl pivalate.

LC/MS (m/z, MH+): 550

Step 4: (S,E)-8-(2,4-Dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule n-3-yl pivalate

Step 4 of Example 23 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from (S)-3-(4-(8-(2,4-dichlorophenyl)-6,7-dihydro-5H-benzo[7]annu len-9- yl)phenoxy)pyrrolidine and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) to give 110 mg (40%) of (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut- 2-en-l-yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7 ]annulen-3-yl pivalate.

LC/MS (m/z, MH+): 661

Step 5: (S,E)-4-(3-(4-(8-(2,4-Dichlorophenyl)-3-hydroxy-6,7-dihydro- 5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbu t-2-enamide

Step 5 of Example 23 was prepared following a similar procedure to that of Example 16 from (S,E)-8-(2,4-dichlorophenyl)-9-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-6,7-dihydro-5H-benzo[7]annule n-3-yl pivalate to give 15 mg (16%) of (S,E)-4-(3-(4-(8-(2,4-dichlorophenyl)-3-hydroxy-6,7-dihydro- 5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbu t-2-enamide.

Example 26: (S,E)-4-(3-(4-(8-(2,4-Dichlorophenyl)-6,7-dihydro-5H-benzo[7 ]annulen-9- yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbut-2-enamide

Step 1: 6,7-Dihydro-5H-benzo[7]annulen-9-yl trifluoromethanesulfonate

To a mixture of 6,7,8,9-tetrahydro-5H-benzo[7]annulen-5-one (1.3 g, 8.1 mmol) in DCM (30 ml) cooled at 0°C were added pyridine (0.98 ml, 12 mmol) and trifluoromethanesulfonic anhydride (4.6 g, 16 mmol). The reaction mixture was stirred at 0°C for 15 minutes and RT for 2 hours. DCM (50 ml) and cold water (30 ml) were added. After decantation, the organic phase was dried over MgSCU, filtered, concentrated under reduced pressure to give 2.4 g (99%) of 6,7-dihydro-5H-benzo[7]annulen-9-yl trifluoromethanesulfonate.

LC/MS (m/z, MH+): 293

Step 2: (S)-3-(4-(6,7-Dihydro-5H-benzo[7]annulen-9-yl)phenoxy)pyrrol idine

Step 2 of Example 26 was prepared following a similar procedure to that of Step 1 of Intermediate 12 from 6,7-dihydro-5H-benzo[7]annulen-9-yl trifluoromethanesulfonate and (3S)-3-[4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)pheno xy]pyrrolidine (prepared according to WO2017140669) to give 1.2 g (49%) of (S)-3-(4-(6,7-dihydro-5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidine.

LC/MS (m/z, MH+): 306 Step 3: (S)-3-(4-(8-Bromo-6,7-dihydro-5H-benzo[7]annulen-9-yl)phenox y)pyrrolidine

Step 3 of Example 26 was prepared following a similar procedure to that of Step 2 of Example 23 from (S)-3-(4-(6,7-dihydro-5H-benzo[7]annulen-9-yl)phenoxy)pyrrol idine and pyridinium tribromide to give 1.48 g (98%) of (S)-3-(4-(8-bromo-6,7-dihydro-5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidine.

LC/MS (m/z, MH+): 384

Step 4: (S)-3-(4-(8-(2,4-Dichlorophenyl)-6,7-dihydro-5H-benzo[7]annu len-9- yl)phenoxy)pyrrolidine

Step 4 of Example 26 was prepared following a similar procedure to that of Step 1 of Example 1 from (S)-3-(4-(8-bromo-6,7-dihydro-5H-benzo[7]annulen-9- yl)phenoxy)pyrrolidine and 2,4-dichlorophenylboronic acid to give 1.2 g (69%) of (S)-3-(4- (8-(2,4-dichlorophenyl)-6,7-dihydro-5H-benzo[7]annulen-9-yl) phenoxy)pyrrolidine. LC/MS (m/z, MH+): 450

Step 5: (S,E)-4-(3-(4-(8-(2,4-Dichlorophenyl)-6,7-dihydro-5H-benzo[7 ]annulen-9- yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbut-2-enamide

Step 5 of Example 26 was prepared following a similar procedure to that of Step 3 of Intermediate 4 from (S)-3-(4-(8-(2,4-dichlorophenyl)-6,7-dihydro-5H-benzo[7]annu len-9- yl)phenoxy)pyrrolidine and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) to give 370 mg (46%) of (S,E)-4-(3-(4-(8-(2,4-dichlorophenyl)-6,7-dihydro-5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbu t-2-enamide.

Example 27: (S,E)-4-(3-(4-(4-(2,4-Dichlorophenyl)-8-hydroxy-2,3- dihydrobenzo[b]thiepin-5-yl)phenoxy)pyrrolidin-l-yl)-N,N-dim ethylbut-2-enamide

Step 1: (S)-5-(4-(Pyrrolidin-3-yloxy)phenyl)-2,3-dihydrobenzo[b]thie pin-8-yl pivalate

Step 1 of Example 27 was prepared following a similar procedure to that of Step 1 of Intermediate 12 from 5-(((trifluoromethyl)sulfonyl)oxy)-2,3-dihydrobenzo[b]thiepi n-8-yl pivalate (prepared according to W02018091153) and (3S)-3-[4-(4,4,5,5-tetramethyl-l,3,2- dioxaborolan-2-yl)phenoxy]pyrrolidine (prepared according to WO2017140669) to give 210 mg (62%) of (S)-5-(4-(pyrrolidin-3-yloxy)phenyl)-2,3-dihydrobenzo[b]thie pin-8-yl pivalate.

LC/MS (m/z, MH+): 424 Step 2: (S)-4-Bromo-5-(4-(pyrrolidin-3-yloxy)phenyl)-2,3-dihydrobenz o[b]thiepin-8-yl pivalate

Step 2 of Example 27 was prepared following a similar procedure to that of Step 3 of Example 23 from (S)-5-(4-(pyrrolidin-3-yloxy)phenyl)-2,3-dihydrobenzo[b]thie pin-8-yl pivalate and pyridinium tribromide to give 300 mg (crude) of (S)-4-bromo-5-(4-(pyrrolidin- 3-yloxy)phenyl)-2,3-dihydrobenzo[b]thiepin-8-yl pivalate.

LC/MS (m/z, MH+): 502

Step 3: (S)-4-(2,4-Dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 2,3- dihydrobenzo [b]thiepin- 8 -yl pivalate

Step 3 of Example 27 was prepared following a similar procedure to that of Step 1 of

Example 1 from (S)-4-bromo-5-(4-(pyrrolidin-3-yloxy)phenyl)-2,3- dihydrobenzo[b]thiepin-8-yl pivalate and 2,4-dichlorophenylboronic acid to give 83 mg (29%) of (S)-4-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 2,3- dihy drobenzo [b ] thiepin- 8 -yl pivalate .

LC/MS (m/z, MH+): 568

Step 4: (S,E)-4-(2,4-Dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-2,3-dihydrobenzo[b]thiepin-8- yl pivalate

Step 4 of Example 27 was prepared following a similar procedure to that of Step 3 of Intermediate 4 (S)-4-(2,4-dichlorophenyl)-5-(4-(pyrrolidin-3-yloxy)phenyl)- 2,3- dihydrobenzo[b]thiepin-8-yl pivalate and (E)-4-bromo-N,N-dimethyl-but-2-enamide (Intermediate 2) to give 61 mg (61%) of (S,E)-4-(2,4-dichlorophenyl)-5-(4-((l-(4- (dimethylamino)-4-oxobut-2-en-l-yl)pyrrolidin-3-yl)oxy)pheny l)-2,3- dihy drobenzo [b ] thiepin- 8 -yl pivalate .

LC/MS (m/z, MH+): 679

Step 5: (S,E)-4-(3-(4-(4-(2,4-Dichlorophenyl)-8-hydroxy-2,3-dihydrob enzo[b]thiepin-5- yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbut-2-enamide

Step 5 of Example 27 was prepared following a similar procedure to that of Example 16 from (S,E)-4-(2,4-dichlorophenyl)-5-(4-((l-(4-(dimethylamino)-4-o xobut-2-en-l- yl)pyrrolidin-3-yl)oxy)phenyl)-2,3-dihydrobenzo[b]thiepin-8- yl pivalate (Intermediate 2) to give 25 mg (47%) of (S,E)-4-(3-(4-(8-(2,4-dichlorophenyl)-3-hydroxy-6,7-dihydro- 5H- benzo[7]annulen-9-yl)phenoxy)pyrrolidin-l-yl)-N,N-dimethylbu t-2-enamide. Examples:

The compounds according to Table la above were subjected to pharmacological tests as presented below.

Test: In vitro anti-proliferation assay

Said test involves measuring the in vitro anti-proliferation activity of the compounds of the Table la.

The measurements of the anti-proliferation activities were made using MCF7- WT (ATCC), MCF7-Y537S and HCC1428-LTED cells as described hereunder.

On Day 1, MCF7-WT and MCF7-Y537S (Mol Cancer Ther. 2021 20(2):250- 262), and HCC1428-LTED (J Clin Invest. 2010;120(7):2406-2413) cells, were seeded at 2000 (WT and LTED) and 500 (Y537S) cells/well in phenol red free IMEM (Coming, 110- 026-CV) with 5% Charcoal stripped-FBS and incubated overnight 37°C and 5% CO2.

On day 2, compounds were tested in triplicate in 10-point dose response (1:3 serial dilutions with a top concentration starting 300nM); DMSO for upper limit (negative control) and staurosporine (luM) for lower limit (positive control) were also included. MCF7-WT cells were then supplemented with final 0.1 nM b-estradiol. After treating the cells, the assay plates were transferred back in the incubator at 37°C and 5% CO2.

On day 8, cell viability was measured per vendor recommendations (CellTiter- Glo, Promega). Relative IC50 measurements were calculated as follow using a 4-parameter logistic derived from Levenburg Marquardt algorithm (IDBS XL Model 205 fit within A- base).

The Table 2 below indicates the anti-proliferation activity results for the compounds of Table la.

Table 2:

It is therefore apparent that the tested compounds have anti-proliferation activities, in both wild-type and mutated cell lines as tested above. As shown in Table 2, the compounds described herein display IC50 activities lower than 1 .M, typically 500 nM or lower activities.

The compounds of formula (I) can therefore be used for preparing medicaments, especially antiproliferative medicaments, as well as medicaments useful in the treatment of diseases wherein the estrogen receptor is involved.

Accordingly, also provided herein are medicaments which comprise a compound of the formula (I), or a pharmaceutically acceptable salt thereof.

Herein are also provided the compounds of formula (I) defined above, or pharmaceutically acceptable salts thereof, for use as medicines. Herein are also provided the compounds of formula (I) defined above, or pharmaceutically acceptable salt thereof, for use in therapy, especially in diseases wherein the estrogen receptor is involved.

Herein are also provided the compounds of formula (I) defined above, or a pharmaceutically acceptable salts thereof, for use in the treatment of ovulatory dysfunction, cancer, endometriosis, osteoporosis, benign prostatic hypertrophy or inflammation.

A particular aspect is a compound of formula (I) defined above, or a pharmaceutically acceptable salt thereof, for use in the treatment of cancer.

In an embodiment, the cancer is a hormone dependent cancer.

In another embodiment, the cancer is an estrogen receptor dependent cancer, particularly the cancer is an estrogen receptor a dependent cancer.

In another embodiment, the cancer is selected from breast, ovarian, endometrial, prostate, uterine, cervical and lung cancer, or a metastasis thereof.

In another embodiment, the metastasis is a cerebral metastasis.

In another embodiment, the cancer is breast cancer. Particularly, the breast cancer is an estrogen receptor positive breast cancer (ERa positive breast cancer).

In another embodiment, the cancer is resistant to anti-hormonal treatment.

In a further embodiment, the compound of formula (I) is as used as single agent or in combination with other agents such as CDK4/6, mTOR or PI3K inhibitors.

According to another aspect, herein is provided a method of treating the pathological conditions indicated above, comprising administering to a subject in need thereof a therapeutically effective amount of a compound of formula (I), or a pharmaceutically acceptable salt thereof. In an embodiment of this method of treatment, the subject is a human.

Herein is also provided the use of a compound of the formula (I), or a pharmaceutically acceptable salt thereof, for the manufacture of a medicament useful in treating any of the pathological conditions indicated above, more particularly useful in treating cancer.

Herein are also provided the pharmaceutical compositions comprising as active principle a compound of formula (I). These pharmaceutical compositions comprise an effective dose of at least one compound of formula (I), or a pharmaceutically acceptable salt thereof, and also at least one pharmaceutically acceptable excipient.

The said excipients are selected, in accordance with the pharmaceutical form and method of administration desired, from the customary excipients, which are known to a person skilled in the art.

In the pharmaceutical compositions for oral, sublingual, subcutaneous, intramuscular, intravenous, topical, local, intra-tracheal, intranasal, transdermal or rectal administration, the active principle of formula (I) above, or its base, acid, zwitterion or salt thereof, may be administered in a unit administration form, in a mixture with conventional pharmaceutical excipients, to animals and to human beings for the treatment of the above disorders or diseases.

The unit administration forms appropriate include oral forms such as tablets, soft or hard gel capsules, powders, granules and oral solutions or suspensions, sublingual, buccal, intra-tracheal, intra-ocular and intra-nasal administration forms, forms for inhalative, topical, transdermal, subcutaneous, intra-muscular or intravenous administration, rectal administration forms and implants. For topical application it is possible to use the compounds of formula (I) in creams, gels, ointments or lotions.

As an example, a unit administration form of a compound of formula (I) in tablet form may comprise the following components:

Compound of formula (I) 50.0 mg

Mannitol 223.75 mg

Sodium croscarmellose 6.0 mg

Com starch 15.0 mg

Hydroxypropylmethylcellulose 2.25 mg

Magnesium stearate 3.0 mg

There may be particular cases in which higher or lower dosages are appropriate.

According to usual practice, the dosage that is appropriate for each patient is determined by the doctor according to the mode of administration and the weight and response of the said patient.