A HIGHLY STEREOSELECTIVE SYNTHESIS OF SERTRALINE

FIELD OF THE INVENTION

The present invention relates to a process for highly stereoselective synthesis of sertraline and sertraline intermediate.

BACKGROUND OF THE INVENTION

U.S. Patent No. 4,536,518, which is herein incorporated by reference, disclosed cis-isomeric derivatives , of 4-phenyl-1 ,2,3, ^r 4-tetrahydro-1- naphthalenamine and their pharmaceutically acceptable salts. These compounds act to block the synaptosomal uptake of serotonin (5-hydroxy- tryptamine), thereby alleviating serotonin abnormalities at central receptor sites. Among them sertraline, chemically (1 S,4S)-4-(3,4-dichlorophenyl)-1 ,2,3,4- tetrahydro-λ/-methyl-1-naphthalenamine is a selective serotonin reuptake inhibitor (SSRI). Sertraline is represented by the following structure:

Processes for the preparations of sertraline, it's pharmaceutically acceptable salts and related compounds were described in U.S. Patent No. 4,536,518, U.S. Patent No. 6,552,227, PCT publication No. WO 99/57093 A1 , U.S. Patent No. 6,232,501 , U.S. Patent No. 6,034,274 and PCT publication No. WO 01/16089.

The key step in the preparation of sertraline or a salt thereof is the hydrogenation of the racemic 4-(3,4-dichlorophenyI)-3,4-dihydro-N-methyl- 1 (2H)-naphthalenimine of formula A:

to obtain the isomers of formulae:

1S-cis-Sertraline 1R-cis-Sertraline 1S-trans-Sβrtraline 1 R-trans-Sertraline

Cis-(+)-Sertraline Trans-(+)-Sertraline

Of the four isomers formed, 1S-cis isomer is desired sertraline and so, all the other three isomers has to be separated from the mixture to obtain the desired isomer. Thus, the preparation of sertraline from racemic sertraline may be represented schematically as below:

(+)-4-(3,4-Dichlorophenyl)-3,4-dihydro- N-methyl-1 (2H)-naphthalenimine

Hydrogenation

Cis-(+)-Sertraline + Trans-(+)-Sertraline

Conversion to hydrochloride salts

Cis-(+)-Sertraline hydrochloride + Trans-(+)-Sertraline hydrochloride

Fractional crystallization

Cis-(+)-Sertraline hydrochloride Neutralization

Cis-(+)-Sertraline

Resolution

1S-cis-Sertraliπe (Sertraline)

Sertraline hydrochloride may also be prepared from 4(S)-(3,4- dichlorophenyl)-3,4-dihydro-N-methyl-1 (2H)-naphthalenimine of formula B:

The preparation of sertraline from 4(S)-(3,4-dichlorophenyl)-3,4-dihydro- N-methyl-1 (2H)-naphthalenimine may be represented schematically as below:

4S-(3,4-Dichlorophenyl)-3,4-dihydro- N-methyl-1(2H)-naphthalenimine

Hydrogenation

1 S-cis-Sertraline + 1 R-trans-Sertraline

Conversion to hydrochloride salt

1S-cis-Sertraline hydrochloride + 1 R-trans-Sertraline hydrochloride

Fractional crystallization

1S-cis-Sertraline hydrochloride

In the above processes, the key step is the hydrogenation step.

U.S. Patent No. 4,536,518 described hydrogenation of imine compound of formula A using Pd/C at room temperature. In this step cis-(+), trans-(+)- sertralines are obtained in about 3 : 1 ratio.

U.S. Patent No. 6,552,227 described hydrogenation of imine compound of formula A using Pd/C or PtO ₂ at a temperature above 40 ⁰ C to obtain cis-(+) and trans-(+) sertralines in higher ratio of cis-(+)-sertraline over the trans-(+) sertraline compound than that obtained in U.S. Patent No. 4,536,518. According to the processes described in the published patent application, the hydrogenation resulted in the formation of cis-(+) and trans-(+) sertralines in the ratio at the maximum of 12:1.

PCT publication No. WO 99/57093 A1 described hydrogenation of imine compound of formula A using Pd applied on a carrier pre-treated with an alkyl halide to obtain cis-(+) and trans-(+) isomers in the ratio of at the maximum of 19 : 1. U.S. Patent No. 6,232,501 describes hydrogenation of 4-(3,4- dichlorophenyl)-3,4-dihydro-N-methyl-1 (2H)-naphthalenimine or 4-(3,4-dichloro phenyl)-3,4-dihydro-N-methyl-1(2H)-naphthalenimine-N-oxide to obtain cis - trans sertraline using copper containing catalyst. The hydrogenation is required to carried out at very high pressure (10 - 15 bars) and/or at high temperatures (100 ⁰ C - 150 ⁰ C).

U.S. Patent No. 6,034,274 describes hydrogenation of 4-(3,4-dichloro phenyl)-3,4-dihydro-N-methyl-1(2H)-naphthalenimine-N-oxide to obtain cis - trans sertraline, followed by conversion into hydrochloride salts and fractional crystallization of cis (±)-sertraline hydrochloride. WO 01/16089 describes reductive amination of 4-(3,4-dichIorophenyl)-

3,4-dihydro-1-(2H)-naphthalenone to obtain cis - trans sertraline, followed by conversion into hydrochloride salts and fractional crystallization of cis (+)- sertraline hydrochloride.

U.S. Patent No. 6,506,940 described the conversion of one stereoisomer of sertraline into another stereoisomers via 4-(3,4-dichlorophenyl)-3,4-dihydro-N- methyl-1 (2H)-naphthalenimine.

U.S. Patent No. 6,723,878 described a method of hydrogenation of 4- (3,4-dichlorophenyl)-3,4-dihydro-N-methyl-1 (2H)-naphthalenimine in the presence of a dehalogenating agent to obtain cis - trans sertraline. The process requires high pressures.

Deschloro impurities of Sertraline, namely cis-(+)-4-(3 or 4-chlorophenyl)-

1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine and cis-(+)-4-phenyl-1 ,2,3,4- tetrahydro-N-methyl-naphthalenamine are common impurities of sertraline and formed when hydrogenation is carried out at high temperature and / or high pressures.

WO 03/099761 describes reductive amination of 4-(3,4-dichlorophenyl)- 3,4-dihydro-1-(2H)-naphthalenone with methylamine to obtain cis - trans sertraline, followed by conversion into hydrochloride salts and fractional crystallization of cis (+)-sertraline hydrochloride.

According to the present invention, it has been found that the imine compounds of above mentioned compounds can be hydrogenated in a highly stereoselective manner in a simple procedure to obtain the cis-isomers of sertraline.

DETAILED DESCRIPTION OF THE INVENTION

According to one aspect of the present invention, there is provided a process for preparing cis-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine of formula I:

which comprises hydrogenating 4-(3,4-dichlorophenyl)-3,4-dihydro-N-methyl- 1 (2H)-naphthalenimine of formula II:

with palladium supported on an alkaline earth metal carbonate to obtain substantially pure cis-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine of formula I.

The preferable alkaline earth metal carbonate is CaCO ₃ or BaCO ₃ and more preferable being CaCO ₃ .

The hydrogenation reaction is preferably carried out at the pressure below about 2 Kg, more preferably at below about 1 Kg and still more preferably at about 0.1 - 1 kg.

Preferably the hydrogenation reaction is carried out at about 10 - 40 ⁰ C, more preferably at about 15 - 40 ⁰ C and still more preferably at about 15 - 35 ⁰ C.

Preferably the hydrogenation reaction is carried out in a solvent selected from alcohols, ketones, hydrocarbon solvents, ester solvents, tetrahydrofuran, water and a mixture thereof, more preferable solvent is selected from alcoholic solvent, water and a mixture thereof. Preferable alcoholic solvent is selected from methanol, ethanol, isopropyl alcohol, tert-butyl alcohol and n-butyl alcohol, more preferable alcoholic solvent is methanol or ethanol. Preferable ketonic solvent is selected from acetone, methyl isobutyl ketone and methyl ethyl ketone, more preferable ketonic solvent is acetone. Preferable hydrocarbon solvent is toluene. Preferable ester solvent is ethyl acetate. The words "substantially pure cis" refers to cis-isomer having its trans- isomer content in about 4% or less of the contents of the cis and trans isomers put together.

Preferably "substantially pure cis" refers to cis-isomer having its trans- isomer content in less than about 2%, more preferably to cis-isomer having its trans-isomer content in less than about 1%, and still more preferably to cis- isomer having its trans-isomer content in less than about 0.5% of the contents of the cis and trans isomers put together.

The hydrogenation of 4-(3,4-dichlorophenyl)-3,4-dihydro-N-methyl-1 (2H)- naphthalenimine if carried out according to prior art resulted in the formation of the mixture of cis-(+)-4-(3,4-dichIorophenyl)-1,2,3,4-tetrahydro-N-methyl- naphthalenamine and trans-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N- methyl-naphthalenamine with trans-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro -N-methyl-naphthalenamine in substantial content. In such a case, there is required to separate the undesired trans-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4- tetrahydro-N-methyl-naphthalenamine from the desired cis-(+)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine and then subject to resolution step to obtain sertraline or a salt thereof. The separation of trans- (+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine from the desired cis-(+)-4-(3,4-dichlorophenyl)^1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine requires the additional steps of a) conversion of the mixture of cis-(+)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-n aphthalenamine and trans-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine isomers into their salts such as hydrochloride salts, b) fractional crystallization of the desired salt (HCI) of cis-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-

methyl-naphthalenamine, and c) neutralization of the separated salt to convert to free base of cis-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine. The separated cis-(+)-4-(3,4-dichlorophenyl)-1 ,2,3,4- tetrahydro-N-methyl-naphthalenamine is then subjected to resolution. By following the highly stereoselective hydrogenation, it is now possible, as a preferred process, to avoid the aforesaid additional steps and the hydrogenated product can directly be subjected to resolution step.

Thus, the novel process makes the process highly productive, commercially viable. Because of the highly stereoselective nature of the process of the invention, sertraline or a salt thereof is obtained in high yield in good purity.

According to the present invention hydrogenation can be carried preferably at low pressures and at ambient temperatures.

According to another aspect of the present invention, there is provided a process for preparing (1S-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N- methyl-naphthalenamine of formula Ia:

which comprises hydrogenating 4(S)-(3,4-dichlorophenyl)-3,4-dihydro-N-methyl- 1(2H)-naphthalenimine of formula Ha:

Ha

with palladium supported on an alkaline earth metal carbonate to obtain substantially pure (1S-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine of formula Ia.

The preferable alkaline earth metal carbonate is CaCO ₃ or BaCO ₃ and more preferable being CaCO ₃ .

The hydrogenation reaction is preferably carried out at the pressure below about 2 Kg, more preferably at below about 1 Kg and still more preferably at about 0.1 - 1 kg.

Preferably the hydrogenation reaction is carried out at about 10 - 4O ⁰ C, more preferably at about 15 - 4O ⁰ C and still more preferably at about 15 - 35 ⁰ C.

Preferably the hydrogenation reaction is carried out in a solvent selected from alcohols, ketones, hydrocarbon solvents, ester solvents, tetrahydrofuran, water and a mixture thereof, more preferable solvent is selected from alcoholic solvent, water and a mixture thereof. Preferable alcoholic solvent is selected from methanol, ethanol, isopropyl alcohol, tert-butyl alcohol and n-butyl alcohol, more preferable alcoholic solvent is methanol or ethanol. Preferable ketonic solvent is selected from acetone, methyl isobutyl ketone and methyl ethyl ketone, more preferable ketonic solvent is acetone. Preferable hydrocarbon solvent is toluene. Preferable ester solvent is ethyl acetate. The hydrogenation of 4(S)-(3,4-dichlorophenyI)-3,4-dihydro-N-methyl-

1(2H)-naphthalenimine if carried out according to prior art resulted in the formation of the mixture of (1S-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N- methyl-naphthalenamine and (1 R-trans)-4-(3,4-dichlorophenyl)-1 ,2,3,4- tetrahydro-N-methyl-naphthalenamine with (1S-trans)-4-(3,4-dichlorophenyl)- 1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine in substantial content. In such a case, there is required to separate the undesired (1 R-trans)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine from the desired (IS-cisM-β^-dichlorophenyO-I ^.S^-tetrahydro-N-methyl-naphthalenamine to obtain sertraline or a salt thereof. The separation of (1 R-trans)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine from the desired (IS-cisH-β^-dichlorophenyO-I ^S^-tetrahydro-N-methyl-naphthalenamine requires the additional steps of a) conversion of the mixture of (1S-cis)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine and (1 R-trans)-4- (3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine isomers into

their salts such as hydrochloride salts, and b) fractional crystallization of the desired isomer (1S-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine as salt.

By following the highly stereoselective hydrogenation, it is now possible, as a preferred process, to avoid the aforesaid additional steps.

Thus, the novel process makes the process highly productive, commercially viable. Because of the highly stereoselective nature of the process of the invention, sertraline or a salt thereof is obtained in high yield in good purity. According to another aspect of the present invention, there is provided a process for preparing (1R-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N- methyl-naphthalenamine of formula Ib:

which comprises hydrogenating 4(R)-(3,4-dichlorophenyl)-3,4-dihydro-N-methyl- 1 (2H)-naphthalenimine of formula Hb:

with palladium supported on an alkaline earth metal carbonate to obtain substantially pure (1 R-cis)-4-(3,4-dichlorophenyI)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine of formula Ib.

(1 R-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine obtained can be subjected to isomerisation by known methods to obtain desired isomer of sertraline.

The preferable alkaline earth metal carbonate is CaCO ₃ or BaCO ₃ and more preferable being CaCO ₃ .

The hydrogenation reaction is preferably carried out at the pressure below about 2 Kg, more preferably at below about 1 Kg and still more preferably at about 0.1 - 1 kg.

Preferably the hydrogenation reaction is carried out at about 10 - 40 ⁰ C, more preferably at about 15 - 40 ⁰ C and still more preferably at about 15 - 35 ⁰ C.

Preferably the hydrogenation reaction is carried out in a solvent selected from alcohols, ketones, hydrocarbon solvents, ester solvents, tetrahydrofuran, water and a mixture thereof, more preferable solvent is selected from alcoholic solvent, water and a mixture thereof. Preferable alcoholic solvent is selected from methanol, ethanol, isopropyl alcohol, tert-butyl alcohol and n-butyl alcohol, more preferable alcoholic solvent is methanol or ethanol. Preferable ketonic solvent is selected from acetone, methyl isobutyl ketone and methyl ethyl ketone, more preferable ketonic solvent is acetone. Preferable hydrocarbon solvent is toluene. Preferable ester solvent is ethyl acetate. The invention will now be further described by the following examples, which are illustrative rather than limiting.

Example 1 Step-I: The mixture of 4-(3,4-Dichlorophenyl)-3,4-dihydro-N-methyl-1 (2H)- naphthalenimine (10 gm), 5% Pd/CaCO ₃ (grade-21 , 0.6 gm), water (2 ml) and methanol (150 ml) is taken in a hydrogenation flask and then subjected to hydrogenation under a hydrogen pressure of 0.5 Kg at 20 - 35 ⁰ C for 3 hours 30 minutes. The catalyst is removed by filtration and the solvent is evaporated completely under vacuum to obtain cis-(+)-4-(3,4-dichlorophenyI)-1 ,2,3,4- tetrahydro-N-methyl-naphthalenamine. (cis-(+) : trans-(+): 99.8 : 0.2).

To the above reaction mass ethyl acetate (65 ml) and water (20 ml) are added and the pH is adjusted to 9.5 - 11.0 with aqueous sodium hydroxide (50%). The organic layer is washed with 10% sodium chloride solution (20 ml)

and then subjected to carbon treatment. Then the reaction mass is heated to 45 - 50 ⁰ C, D-(-)-mandelic acid (2.9 gm) is added at 45 - 50 ⁰ C and stirred for 2 hours at the same temperature. The mass is cooled to 25 - 35 ⁰ C, stirred for 12 hours at 25 - 35 ⁰ C, then cooled to 0 - 5 ⁰ C and stirred for 1 hour at the same temperature. Filtered the mass and washed with ethyl acetate, methanol (15 ml) is added and then heated to reflux. The contents are stirred for 1 hour at reflux and cooled to 25 - 35 ⁰ C. Then the reaction mass is cooled to 0 - 5 ⁰ C and stirred for 1 hour at 0 - 5 ⁰ C. Filtered the solid, washed with methanol and dried to give 4.6 gm of (1S-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl- naphthalenamine mandelate (trans-(+): not detected). Step-ll:

Water (30 ml) and ethyl acetate (35 ml) are added to (1S-cis)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine mandelate

(obtained in step-l), cooled to 10 - 18 ⁰ C and aqueous sodium hydroxide (50%) is slowly added for 1 hour 30 minutes at 10 - 18 ⁰ C (to adjust the pH to 9.5 - 11.0). The contents are stirred for 30 - 45 minutes, separated the aqueous layer and discarded it. Activated carbon (0.25 gm) is added to the reaction mass, stirred for 15 - 30 minutes, filtered and washed with ethyl acetate (5 ml). Distilled off ethyl acetate under reduced pressure until the mass temperature reaches to 50 - 55 ⁰ C, n-bύtanol (30 ml) is added, stirred for 30 minutes, cooled to 5 - 15 ⁰ C and then cone, hydrochloric acid is slowly added during 20 minutes at 5 - 15 ⁰ C (to adjust the pH to below 2). The contents are stirred for 3 hours at 5 - 15 ⁰ C, filtered the mass and washed with diisopropyl ether (5 ml). Diisopropyl ether (30 ml) is added to the solid, cooled to 5 - 15 ⁰ C and stirred for 1 hour at 5 - 15 ⁰ C. Filtered the solid and dried at 45 - 50 ⁰ C to give 2.5 gm of sertraline hydrochloride (HPLC purity: 99.9%).

Example 2

The mixture of 4(S)-(3,4-Dichlorophenyl)-3,4-dihydro-N-methyl-1(2H)- naphthalenimine (10 gm), 5% Pd/CaCO ₃ (grade-21, 0.6 gm), water (2 ml) and methanol (150 ml) is taken in a hydrogenation flask and then subjected to hydrogenation under a hydrogen pressure of 0.5 Kg at 20 - 35 ⁰ C for 3 hours 30 minutes. Then filtered the mass and washed with methanol to obtain (1S-cis)-4- (3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine (1S-cis : 1S- trans : 99.8 : 0.2). The resulting mass is distilled under vacuum and then

subjected to carbon treatment. Cone, hydrochloric acid is added to the reaction mass at 10 ⁰ C to adjust the pH below 2 and stirred for 2 hours at 10 ⁰ C. The resulting mass is centrifuged, washed with methanol, the wet cake is slurried in methanol (40 ml) and dried to give 8 gm of (1S-cis)-4-(3,4-dichlorophenyI)- 1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine hydrochloride (1 R-trans: not detected).

Example 3

Example 1 is repeated by using the solvent ethanol in step-l instead of methanol to give 2.4 gm of sertraline hydrochloride (HPLC purity: 99.8%).

Example 4

Example 1 is repeated by using the solvent acetone in step-l instead of methanol to give 2.3 gm of sertraline hydrochloride (HPLC purity: 99.7%). Example 5

Step-l:

The mixture of 4-(3,4-Dichlorophenyl)-3,4-dihydro-N-methyl-1 (2H)- naphthalenimine (10 gm), 5% Pd/CaCO ₃ (grade-21 , 0.6 gm), water (2 ml) and methanol (100 ml) is taken in a hydrogenation flask and then subjected to hydrogenation under a hydrogen pressure of 0.5 Kg at 20 - 35 ⁰ C for 3 hours 30 minutes. Then filtered the mass and washed with methanol to obtain cis-(+)-4- (3,4-dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine (cis-(+) : trans-(+): 99.7 : 0.3). The resulting mass is distilled under vacuum and then subjected to carbon treatment. Cone, hydrochloric acid is added to the reaction mass at 10 ⁰ C to adjust the pH below 2 and stirred for 2 hours at 10 ⁰ C. The resulting mass is centrifuged, washed with methanol, the wet cake is slurried in methanol (40 ml) and dried to give 8 gm of cis-(+)-4-(3,4-dichlorophenyl)-1 , 2,3,4- tetrahydro-N-methyl-naphthalenamine hydrochloride (trans-(+): not detected). Step-ll: Ethyl acetate (60 ml) and water (40 ml) are added to cis-(+)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyI-naphthalenamine hydrochloride (obtained in step-l) and the contents are cooled to 10 - 20 ⁰ C. Then 50% aqueous sodium hydroxide (7.8 ml) is added at 10 - 20 ⁰ C during 1 hour 30 minutes (pH: 9.5 - 11.0), stirred for 1 hour, the aqueous layer is separated and

discarded it. The ethyl acetate layer is washed with distilled water (14 ml) and discarded the aqueous layer. The contents are heated to 40 - 50 ⁰ C, D-(-)- mandelic acid (2.8 gm) is added, stirred for 2 hours at 40 - 50 ⁰ C and then stirred at 25 - 30 ⁰ C for 12 hours. The reaction mass is cooled to 0 - 5 ⁰ C, filtered the mass and washed with ethyl acetate (6.3 ml). Methanol (20 ml) is added to the wet cake, heated to reflux temperature and refluxed for 30 - 45 minutes. Then the reaction mass is cooled to 0 - 5 ⁰ C and stirred for 2 hours at the same temperature. The resulting solid is filtered, washed with 7 ml of methanol and dried at 60 - 65 ⁰ C to give 4.2 gm of (1S-cis)-4-(3,4-dichlorophenyl)-1 ,2,3,4- tetrahydro-N-methyl-naphthalenamine mandelate. Step-Ill:

Water (25 ml) and ethyl acetate (30 ml) are added to (1S-cis)-4-(3,4- dichlorophenyl)-1 ,2,3,4-tetrahydro-N-methyl-naphthalenamine mandelate

(obtained in step-ll), cooled to 10 - 18 ⁰ C and 50% aqueous sodium hydroxide (2.6 ml) is slowly added for 1 hour 30 minutes at 10 - 18 ⁰ C (pH: 9.5 - 11.0). The contents are stirred for 30 - 45 minutes, separated the aqueous layer and discarded it. Activated carbon (0.3 gm) is added to the reaction mass, stirred for 15 - 30 minutes, filtered and washed with ethyl acetate (5 ml). Distilled off ethyl acetate under reduced pressure until the mass temperature reaches to 50 - 55 ⁰ C, n-butanol (30 ml) is added, stirred for 30 minutes, cooled to 5 - 15 ⁰ C and then cone, hydrochloric acid (1.5 ml) is slowly added during 45 minutes at 5 - 15 ⁰ C (pH: 1.0). The contents are stirred for 3 hours at 5 - 15 ⁰ C, filtered the material, washed with diisopropyl ether (40 ml) and dried at 45 - 50 ⁰ C to give 2.1 gm of sertraline hydrochloride (HPLC purity: 99.8%).