To a suspension of 176 mg of (S)-3-[(R)-1-(3-methoxyphenyl)ethylamino]pyrrolidine dihydrochloride, 110 mg of (3-trifluoromethyl)benzaldehyde and 636 mg of sodium triacetoxyborohydride in 10 ml of methylene chloride was added several drops of acetic acid, and the mixture was stirred at room temperature for 16 hours. To the reaction mixture were added a saturated aqueous sodium bicarbonate solution and chloroform, the mixture was stirred and the liquids were separated. The organic layer was dried, the solvent was removed, and then, the residue was purified by NH silica gel column chromatography (hexane:ethyl acetate=10:1) to obtain 91.2 mg of (R)-1-(3-methoxyphenyl)ethyl-[(S)-1-(3-trifluoromethylbenzyl)pyrrolidin-3-yl]amine. (2) In 10 ml of ethyl acetate was dissolved 91.2 mg of (R)-1-(3-methoxyphenyl)ethyl-[(S)-1-(3-trifluoromethylbenzyl)pyrrolidin-3-yl]amine, and 1 ml of a solution of 4M hydrochloric acid in ethyl acetate was added, and the mixture was stirred. The reaction mixture was evaporated, diethyl ether was added to the residue, and after collecting the precipitates by filtration, it was washed with diethyl ether and dried to obtain 70.4 mg of (R)-1-(3-methoxyphenyl)ethyl-[(S)-1-(3-trifluoromethylbenzyl)pyrrolidin-3-yl]amine dihydrochloride (Example 4.001 in the following Table B).
