Technical field

The present invention relates to novel hydroximic acid halides, the preparation of the same, pharmaceutical compositions containing the above novel compounds as active ingredient as well as the use of the said compounds in the therapy of diabetic angiopathy.

Background art

One of the most frequent metabolism diseases is diabetes mellitus, the main symptom of which is the disturbance of the balance of carbohydrate metabolism in the organism. Diabetes mellitus is often accompanied by pathological vascular defor¬ mations, e.g. vasoconstrictions in the limbs, pathological deformation of the eyeground vessels, etc. Though, in addi¬ tion to insulin a large number of effective drugs are known, in the field of the treatment of diabetic angiopathy associ¬ ated with the basic disease, results provided by the commer¬ cially available compositions are quite poor. This situation is caused by the phenomenon that diabetes mellitus results in changes of the vascular adrenerg receptors, and consequently, medical treatment with the commercially available drugs results in adrenerg reaction different from those taking place in the blood vessels of non-diabetic patients. (Nature

New Biology, 243, No. 130, 276 /1973/; Szemέszet, 111, 23 /1974/; Endocrinology, 93, 752 /1973/) . The adrenerg recep¬ tors of blood vessels in diabetic patients undergo a trans¬ formation into beta receptors due to the quantitative in- crease of the metabolism. For the receptor transformation, the release of a modulator is responsible (Amer.J.Physiol. , 218, 869 /1970/) . After addition of the modulator to the alpha organ the alpha agonists will not be active any more as the receptor is transformed into beta. The original alpha sensibility may be recovered by adding a special beta blocking agent into the organism.

In case of qualitative alteration of the metabolism in model or human in vivo diabetes the alpha agonists, e.g. noradrenalin, remain effective, this effect, however, may be compensated by the addition of beta blocking agents. This is the first functional change which is detectable in diabetes, e.g. by addition of Alloxane (Hexahydropirimidin—tetraon) , 24 hours after the administration. In case of diabetes an imperfect alpha—beta receptor transformation - possibly due to the formation of an alternative, so—called "Falsch" modulator - serves as starting point of the pathological changes.

Disclosure of the invention

It has been found that the novel compounds of the formula (I) wherein X is halo, such as fluoro. chloro. bromo and io o. H ³ - is hydrogen or d— _s alkyl.

R ² is Cι-5 alkyl, C ₅ _ cycloalkyl or phenyl each optionally being substituted with hydroxy, and

R ¹ and R ² , when taken together with the adjacent nitrogen atom, form a 5—8 membered ring optionally containing addi- tional nitrogen and/or oxygen atom, which ring may also be condensed with a benzene ring, R ³ is hydrogen, phenyl, naphtyl or piridyl optionally substituted with one or more halo or alkoxy, R ⁴ is hydrogen or phenyl, R ⁵ is hydrogen or phenyl, m is the integer of 0, 1 or 2 and n is the integer of 0, 1 or 2, essentially do not influence, or only slightly, the adrenerg reactions of the healthy blood vessels, but show a strong ^• effect on the adrenerg receptors deformed by the diabetes mellitus. This effect appears in the first line as a selec¬ tive beta-blocking effect, consequently, the compounds of the general formula (I) are useful in medical influencing of diabetic angiopathy. The common beta-blocking agents <Inderal, l-(methyl-ethyl- amino)-3-(l-naphtalenyloxy)-2-propanol, Visken, 4,5-dihydro-2-(5-methy1-2-/1-methy1-ethy1-phenoxy/-methy1)-1 H- imidazol> are contraindicated in the therapy of diabetic angiopathy. Diabetes selective adrenerg receptor blocking compounds are described in Hungarian Patent No. 177,578, "Process for prepa¬ ring novel OF-(3-amino-2-hydroxypropyl)-amidoxim derivatives". An o ner ocjec. or tne invention is the process for prepar-

ing the compounds of the general formula (I) and the salts thereof. According to the process a) an aldoxim of the general formula (III) wherein R ³ , R-*. R ^s , m and n are as defined above, is reacted in the presence of a base with an amine of ^" the general formula (IV/A) and

CIV/B) , resp., wherein R ¹ and R ² are as defined above and X is halo, or b) an aldoxim of the general formula (III), wherein R ¹ -, R ² R ³ , m and n are as specified above, is reacted with epichlo- rohydrine and the aldoxim derivative of the general formula (VI) thus obtained is reacted with an amine of the general formula (V), wherein R ¹ and R ² are as specified above, to obtain the aldoxim derivatives of the general formula (VII), and ,, the compounds of the general formula (VII) according to the above processes a) or b) are reacted with inorganic acid halides, or other halogenating agents, e.g. POX ₃ , S0X ₃ , PX _S - wherein X is halo - to obtain the halo derivatives of the general formula (VIII), and by replacing the halo atom on the aliphatic chain thereof with hydroxy, the compounds of the general formula (I) are obtained, or c) an a idoxim derivative of the general formula (II) is diazotized in the presence of NaN0 ₂ and HX - wherein X is halo — and subjected to "boiling away" reaction. If desired, the free bases of the general formula (I) may be transformed to acid addition salts by reacting with organic or inorganic acids, or the compounds obtained as salts may be transformed into the free bases.

SUBSTITUTESHEET

According to a preferred embodiment of the process a) the reaction is carried out in aqueous medium, in an aqueous organic solvent, such as aqueous alcohol or in organic sol¬ vents, preferably at a temperature of 0 to 140°C. According to an other embodiment of the process variant a) the salts of the aldoximes of the general formula (III) are formed in dry alcoholic medium with alkali alcoholates, and subsequently the solutions of the amines of the general formulae (IV/A) and (IV/B), resp. , in alcohol are added thereto. The reaction is preferably carried out at a tempera¬ ture of 0 to 100°C under stirring.

According to a still another embodiment of the process variant a) the salts of the aldoximes of the general formula (III) are formed in a solvent non-miscible with water, such as benzene, toluene, xylene, with alkali hydroxides, prefera¬ bly sodium or potassium hydroxide. The salt forming is car¬ ried out at the boiling temperature of the solvent, and the water forming during the reaction is continuously removed by azeotropic distillation, followed by the addition of the solution of the compounds of the general formulae (IV/A) and (IV/B), resp.

According to an other embodiment of the process variant a) the reaction is carried out in aqueous medium, by adding to the compounds (IV/A) or (IV/B) the aqueous-alkaline solution or suspension of the aldoximes under stirring.

The reaction is carried out preferably at a temperature of 0 to 60°C and the aldoxim is added to the reaction mixture in

SUBSTITUTESHEE

the fornrfof solution or suspension of a temperature of 5 to 20°C in aqueous alkali solution. The reaction may also be carried out in a mixture of water and an organic sol¬ vent, wherein to the solution of the compound of the general formula (IV/A) or (IV/B) in alcohol or dioxane the aqueous-alkaline solution or suspension of the aldoxim is added dropwise. The addition may also be accomplished in reversed order, i.e to the aqueous-alkaline solution or sus¬ pension of the aldoxim is added the other reaction partner. According to process variant b) the aldoxim of the general formula (III) is reacted with epichlorohydrine in the presence of a base. If desired, the epoxy compound obtained during the reaction may be isolated, it is preferred, howev¬ er, to carry out the reaction in one synthesis step, without isolating the intermediate, in aqueous medium or in an organ¬ ic solvent, aqueous organic solvent, or in a two-phase sys¬ tem, at a temperature of -10 to + 60°C, by adding the reagent in one or two portions or dropwise. The order of addition may be reversed, i.e. either the alkaline solution or suspension of the aldoxim is added to the epichlorohydrine, or the aldoxim is added to the mixture of the epichlorohydrine and base. If desired, the intermediate of the formula (VI) may be separated by extracting with a solvent non-miscible with water. It is more preferred, however, to react the compound of the general formula (VI) without isolation with the corre¬ sponding amine.

The process variant b) may also be carried out in dry sol-

SUBSTITUTESHEET

vents, preferably dry alcohols. In this case the alkali metal salt of the aldoxim is formed, suitably by dissolving the aldoxim in a solution of alkali alcoholate in alcohol. Fol¬ lowing the addition of the ep chlorohydrine, the reaction mixture is allowed to stand for 1 to 5 days at a temperature of 0 to 20°C and subsequently the reaction is carried on by the addition of the corresponding amine, at ambient tempera¬ ture or by heating the mixture. Besides the alcohol, as dry solvent also other organic solvents, e.g. aceton, dimethyl sulfoxide, dimethyl formamide, etc. or the mixtures thereof may be used.

The compounds of the general formula (VII) obtained accord¬ ing to the processes a) or b) can be isolated by methods known per se. If aqueous medium is used, the isolation is generally accomplished by extraction, followed by drying and evaporating the solvent. Subsequently the aldoxim derivative of the formula (VII) is boiled with the inorganic acid ha¬ lides, such as PCls, S0C1_>, P0C1 ₃ for 1 to 5 hours in the presence or absence of a solvent, preferably halogenated solvents, such as CHC1 ₃ . The compounds of the general formula (VII.) thus obtained can be isolated by making the mixture alkaline with aqueous alkali, followed by extraction.

The compound of the general formula (VIII) is a hydroximic acid halogenated in the chain. It has been found that the halo moiety thereof will not enter into nucleophylic substi¬ tution reaction under the reaction conditions, and according¬ ly, the formation of the OH group will be accomplished selec-

tively, in one step by aqueous—alkaline hydrolysis at a temperature of 0 to 100°C, using preferably alkali hydroxides or other metal hydroxides, e.g. silver hydroxide, or in two steps, first forming an ester moiety suitably with the alkali salts of lower carboxylic acids followed by the hydrolysis to obtain the compounds of the general formula (I).

The reaction conditions of process variant c) are selected so that the temperature is maintained between —5 and +1Q---C and thus, also the "boiling away" reaction takes place. Preferably the reaction is carried out in water, and the intermediate diazonium salt is not isolated but also the "boiling away" reaction is carried out by selecting suitable reaction conditions thus obtaining the compounds of the general formula (I) . The reaction products can be separated from the reaction mixture by methods known per se, e.g by crystallisation and extraction, when using water as reaction medium. When organic solvents are used, crystallisation or evaporation followed by washing with water and extraction is applied. The products may be isolated in the form of salts thereof, or from the isolated bases salts may be formed by using molar equivalent of mineral or organic acids, preferably pharmaceutically acceptable acids, or, if desired, from the salts the free bases can be obtained. The general beta—blocking effect of the compounds of the general formula (I) was studied on anaesthetised cats. In these tests besides registering the blood pressure and pulse

rate, also the effect of the test materials on the left ventricular contractility was studied. As reference material Inderal <l-isopropylamino-3-(naphtyloxy)-propan-2-ol> was used. The beta-blocking effect of the compounds according to the present invention was tested on rat aorta spiral and/or ring preparate <J.Pharmacol .Exp.Therap. 158, 531 (1967) >. The experimental diabetes was induced with Streptosotocin <2-(3-nitroso-3-methylureido)-2-deoxy-D-glucose>. The reac- tion was evaluated as positive when the alpha stimulating effect of the noradrenal n on the control preparate, i.e. that having not been treated with Streptosotocin, was not influenced, but protected on the diabetic aorta. In the tests carried out with the compounds according to the present invention a general selective effect occurred, manifesting in case of diabetic tests in a strong, in case of normal tests in the absence of or in the presence of only a slight beta- blocking effect.

Experiments were carried out to study whether on the aorta spiral preparates of diabetic animals treated with Streptosoto¬ cin the Inderal protects the contractions induced by norad¬ renalin. As control, animals previously not treated with Streptosotocin were used. The results obtained essentially conformed to those known from the literature <Ame .J.Physiol . , 218, 869 (1970) >, i.e. the alpha stimulating effect of nor¬ adrenalin was protected by the Inderal in diabetic tests, but not in the normal tests. (Endocrinology,Vol . 93, No.

3 , Sept . 1973) .

It has been found that the compounds of the general formula (I) showed a slight general beta—blocking effect. Compared with the control beta-blocking Inderal the com- pounds tested showed an effect of two orders of magnitude less in the inhibition of the beta-blocking D,L—l-(3,4— dihydroxy-phenyl)—2-isopropylamino-ethanol .

At the same time the compounds of the general formula (I) produced a significant parallel shift to the right of the noradrenalin dose-response curve in diabetic rat aorta ring (and/or spiral) in the order of magnitude of the effect of Inderal. The dose of Inderal was 0,5 micrograms/ml, while the dose of the compounds of the general formula (I) was 1,0 microgram/ml . Accordingly, the 0-(3-amino-2-hydroxypropyl)-hydroximic acid halides of the general formula (I) may preferably be used in the therapy of any kind of diabetic micro- and macroangiopa- thy, especially of diabetic retinopathy and diabetic nephrop- athy in case of diabetes mellitus. The above compounds can be used per se or in the form of pharmaceutical preparations. The above treatment and pharmaceutical compositions also form the object of the. present application. The pharmaceuti¬ cal compositions of the present invention can be used for prevention, for treatment in the active phase of the disease as well as in acute cases.

The hydroximic acid halides of the general formula (I) are effective exclusively on patients in the stadium of formation

of diabetes, and are ineffective on non-diabetic persons.

Best mode of carrying out the invention

Preferred are those compounds of the general formula (I) wherein X is chloro, m and n are each 0, R ³ is 3,4- dimethoxybenzyl, piridyl, napthyl or indolyl and R ¹ is and R ² is isopropyl, 2-hydroxyethyl or t-butyl, or R ¹ and R ² togeth¬ er form pentamethylene. Especially preferred active compounds are those mentioned in the following examples. The invention is further illustrated in the following exam- pies. It is to be understood, however, that the scope of protection is not limited to the matter disclosed in the examples any way.

Examp1e 1.

2,3 g of sodium were dissolved in 200 ml of abs. ethanol and then 12,1 g of benzaldoxim were added. At boiling temperature the solution of 3-piperidino-2-hydroxy-l-chloropropane pre¬ pared from 9,3 g epichlorohydrine and 8,5 g of piperidine in 5o ml of abs. ethanol by methods known per se was added dropwise. The reaction mixture was boiled for 8 hours under reflux, the precipitated salt was filtered at room tempera¬ ture and the solvent was distilled off in vacuo. To the residue 100 ml of 5% sodium hydroxide were added and the oily product was extracted with benzene. After drying and evapo¬ rating the benzene extract 8,2 g of 0-(3-piperidino-2-hy-

droxy—1-propyl)-benzaldoxim was obtained. The hydrochloride of the product was separated from the isopropanol solution thereof by introducing gaseous hydrochloric acid into or adding hydrochloric acid in ethanol to the solution. Mp. 137°C (from isopropanol) .

Analysis based on C -5H ₂₃ ClN-a0 ₂ : Mw. 298,81 Calculated: C 60,29, H 7,76, N 9,37, Cl 11,86; Found: C 60,35, H 8,00, N 9,25, Cl 11,90%. 2,98 g of 0-(3-piperidino-2—hydroxy-1—propyl)-benzaldoxim were boiled in 20 ml of thionyl chloride for 3 hours. The 0- (3-piperidino-2—chloro—1— ropyl)—benzhydroxi ic acid chloride was separated by adding about 100 ml of 20 % aqueous base until pH = 11 followed by extraction with chloroform. The chloroform extract was dried over sodium sulfate and evapo- rated. The-oil-like product can be transformed into the compound of the general formula by different ways.- a) 3,4 g of oily product were hydrolized with 20 ml of 2*2%

NaOH at 55 to 60°C for 2 hours under stirring, extracted with benzene, the benzene solution was dried with solid drying agent and subsequently evaporated. To the residue 50 ml of hydrochloric acid in ethyl acetate was added. Under stirring the hydrochloride of the 0-(3-piperidino-2-hydroxy-l-propyl)- benzhydroximic acid chloride precipitated. Yield: 2,1 g. NMR (base, CDC1 ₃ ) : 7,4-8,0 m (5H) ; 3,9-4,4 m (3H) ; 2,2-2,8 (6H) ; 1,3-1,8 m (6H) ; 3,5 s (OH).

Mp. 140-142°C ( from isopropanol)

Analysis: based on C_L-5H _2Z C1 _{2 2} 0 ₂ :

Calculated: C 54,22, H 6,37, N 8,43, Cl 21,14; Found: C 53,12, H 6,26, N 8,19, Cl 20,84%. b) 0,81 g (4,74 moles) of AgN0 ₃ were dissolved in 4 ml of water and under stirring 0,19 g of NaOH (4,74 mmoles) in 3 ml of water was added thereto dropwise. The aqueous suspension of the AgOH precipitate was stirred with 1,5 g (4,74 mmoles) of 0-(3-piperidino-2-chloro-l-propyl )-benzhydroximic acid chloride at 50°C for 3 hours. Then the suspension was ex¬ tracted with benzene, the benzene layer was dried with sodium sulfate, filtered, evaporated and subjected to the salt forming step described in process a) . Yield 95%. The physical data of the end product are identical with those in process a) . c) 3,0 g (9,49 mmoles) of 0-(3-piperidino-2-chloro-l-propyl)-benzhydroximic acid chlo¬ ride were dissolved in 10 ml of ethanol, under stirring 0,86 g (1,05.10 ^-2 moles) of sodium acetate in 15 ml of water were added and the mixture was stirred for 3 hours at 50°C. The reaction mixture was evaporated in vacuo and the residue was extracted with benzene. The benzene extract was dried over sodium sulfate and evaporated, thus providing 2,12 g of oily 0-(3-piperidino-2-acetoxy-l-propyl)-benzhydroximic acid chloride. The ester thus obtained was dissolved in 20 ml of ethanol followed by the addition of 20 ml of water. 0,25 g of NaOH in 20 ml of water were added to the mixture and stirred at 40°C for one hour, extracted with benzene, the benzene extract was dried with sodium sulfate and evaporated. From

the residue salt was formed according to the method in proc¬ ess a) . Yield 90%. The quality of the product was identical with that of process a) .

Exam le 2. Following the process as described in Example 1 but starting from 3-piridyl-aldoxim and 3—piperidino-2—hydroxy—1-chloro- propane the 0—(3-piperidino-2-hydroxy-l-propyl)-3-piridyl- aldoxim was prepared, which was reacted with thionyl chloride according to Example 1. After removing the thionyl chloride by evaporation, isopropanol was added to the residue thus crystallising the 0-(3-piperidino-2-chloro-l-propyl)-3-piri- dyl-hydroximic acid chloride in the form of the dihydrochlo- ride. Mp. 142°C ( from isopropanol) . Yield 85 %. Analysis based on Cι ₄ H ₂ ιCl ₄ N ₃ 0: Mw = 389,15 Calculated: C 43,21, H 5,44, N 10,79, Cl 36,44; Found: C 42,97, H 5,62, N 10,59, Cl 36,80%.

According to another mode of preparation the 0-(—3- piperidino—2-chloro-l-propyl)—3-piridyl-hydroximic acid chloride dihydrochloride obtained as above was not isolated, instead, to the evaporation residue 10 % NaOH was added until a pH of 11 in accordance with Example 1 and the mixture thus obtained was extracted with chloroform. The chloroform layer was dried, evaporated and subsequently hydrolized by using any of the processes a), b) and c) of Example 1. The hydroly- sis mixture was extracted with benzene, dried with sodium sulfate and evaporated. The residue was dissolved in aceton

followed by the addition of maleic acid and isolating the 0- (3-piperidino-2-hydroxy-l-propyl)-3-piridyl-hydroximic acid chloride maleate thus obtained by filtering. NMR (base, CDC1 ₃ ) : 9,03, 8,59, 8,00, 7,1-7,4, 3,84 s (3H) , 1,1-1,8 (6H), 5,28 s (OH) .

Mp. 125°C (from aceton) . Yield 65 %. Analysis based on C_. _β H ₂ _ιClN ₃ 06: Mw. = 413,79 Calculated: C 52,24, H 5,84, N 10,15, Cl 8,55; Found: C 52,26, H 5,99, N 9,87, Cl 8,46%.

Example 3

To 3,5 g (10 mmoles) of 0-(3-piperidino-2-hydroxy-l-propyl)- -benzamidoxim dihydrochloride 40 mmoles of hydrogen chloride (in 37 % form) was added at 5°C under vigorous stirring. After the addition of 5 ml of dioxane the mixture was cooled to 0°C by using salt-ice. At the same temperature a solution of 1,38 g (20 mmoles) of NaN0 ₂ in 6 ml water was added drop- wise during a period of 1,5 hours followed by intensive stirring for 4 hours at ambient temperature. The acidic reaction mixture was made alkaline by the addition of 10 % sodium hydroxide until a pH of 11 and then extracted with 80 to 100 ml of benzene. The benzene layer was dried over sodium sulfate and evaporated. From the residue the hydrochloride of the 0-(3-piperidino-2-hydroxy-l-propyl)-benzhydroximic acid chloride was formed by the addition of a saturated solution of hydrochloric acid in ethyl acetate and isolated by filter¬ ing. Mp. 139-141°C.

Analysis based on CisHazClaNaOa: Mw = 333,25 Calculated: C 54,22, H 6,37, N 8,43, Cl 21,14; Found: C 54,62, H 6,16, N 8,09, Cl 20,71%.

Example 4 The process described in Example 3 was followed but instead of hydrochloric acid, hydrogen bromide was used as hydrogen halide, thus obtaining the 0-(3-piperidino-2-hydroxy-l-pro- pyl)-benzhydroximic acid bromide hydrochloride. Yield 27 %. M . 138°C (from isopropanol) Analysis based on dsHssB ClNaOz: Mw = 377,71 Calculated: C 47,63, H 5,87, N 7,41; Found: C 47,60, H 6,19, N 7,50%.

Exam 1e 5

Following the process as described in Example 3 0—(3- piperidino—2-hydroxy—l-propyl)-nicotinic acid amidoxim dihy- drochloride was diazotized, by using hydrochloric acid as hydrogen halide. Following the diazotizing and "boiling away" reaction from the 0-(3-piperidino-2-hγdroxy-propyl)-3-piri- dyl-hydroximic acid chloride the maleate was formed in dry organic solvent by adding molar equivalent of maleic acid, and then separated. Mp. 125 ^C, C ( from aceton) . Yield 58 %. Analysis based on C_LβH ₂ 4ClN ₃ 0 _β : Mw = 413,79 Calculated: C 52,24, H 5,84, N 10,15, Cl 8,55; Found: C 52,26, H 5,99, N 9,87, Cl 8,46%.

LDsβ: 110 mg/kg iv. on Wistar rats.

Example 6

Following the process as described in Example 5 but using hydrogen bromide instead of the hydrochloric acid as hydrogen halide, the 0-(3-piperidino-2-chloro-l-propyl)-3-piridyl- hydroximic acid bromide maleate was obtained. Yield: 58 %. Mp. 117°C (from aceton)

Analysis based on CieH ₂ -aBrN ₃ O _e : Mw = 457,25 Calculated: C 47,36, H 5,21, N 9,16, Br 17,13; Found: C 47,67, H 5,31, N 8,80, Br 16,78%.

Example 7

Following the process as described in Example 3 but using

0-(3-piperidino-2-hydroxy-l-propyl)-3, 3-diphenyl-propionic acid hydroximic acid dihydrochloride as amidoxim component in the diazotizing reaction, the 0-(3-piperidino-2-hydroxy-l-

-propyl )-3,3-diphenyl-propionic acid hydroximic acid dihydrochloride was obtained.

Yield: 30 %. Mp . 149-152°C (from isopropanol) .

NMR (base, DMS0d ₆ ) : 7,1-7,6 m (10H), 4,5 t (14), 3,34 d (2H) , J = 7,5 Hz, 3,9 br s (3H) , 2,3-3,0 m (6H), 1,3-1,9 m (6H) , OH shaded.

Analysis based on C ₂₃ H _3<3 C1 ₂ N ₂ 0 ₂ 2: Mw = 437,40

Calculated: C 63,15, H 6,51, N 6,40, Cl 16,21;

Found: C 63,50, H 6,79, N 6,31, Cl 16,47%.

Examp le 8

Following the process as described in Example 3 but using 0—(3-diethyl mino-2-hydroxy-l-propyl)-3,3-diphenyl-propionic acid amidoxim dihydrochloride as starting amidoxim component, the 0-(3-diethylamino-2-hydroxy-l-propyl)-3,3-diphenγl-propi- onic acid hydroximic acid chloride dihydrochloride was ob¬ tained. Yield: 32 %. M . 155°C (from isopropanol). Analysis based on C ₂₂ H _3β Cl ₂ N ₂ 0 ₂ : Mw = 425,40 Calculated: C 62,11, H 7,10, N 7,52, Cl 16,66; Found: C 62,10, H 6,98, N 7,45, Cl 17,00%.

Example 9

Following the process as described in Example 3 but using 0—(3—isopropylamino-2-hydroxy-l— ropyl)-benzamidoxim dihydro¬ chloride as starting amidoxim component, the 0-(3- isopropylamino-2-hydroxy-l-propyl)-benzhydroximic acid hydro¬ chloride was prepared. Yield 12 %. Mp. 122°C (from isopropa¬ nol) .

Analysis based on C _i3 H _2β Cl ₂ N ₂ 0 ₂ : Mw = 307,22 Calculated: C 50,82, H 6,56, N 9,11, Cl 23,08; Found: C 51,12, H 6,58, N 9,05, Cl 22,89%.