Triethylamine → 3-(2-Chlorophenyl)-5-methylisoxazole-4-carboxylic acid [4-dimethylamino-4-(3-fluorophenyl)cyclohexyl]amide

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反応手順

The non-polar diastereoisomer of 1-(3-fluorophenyl)-N,N-dimethylcyclohexane-1,4-diamine (350 mg) was placed with 220 μI triethylamine (1.05 molar equivalents) and catalytic amounts of DMAP (about 5 mg) in 3.5 ml dichloromethane, 400 mg 3-(2-chlorophenyl)-5-methylisoxazole-4-carbonylchloride (1.05 molar equivalents), dissolved in 2 ml dichloromethane, were added dropwise at −10° C. to and the mixture was stirred overnight while being heated to room temperature. For working up, the mixture was made alkaline (pH>10) with 2-molar sodium hydroxide solution, with ice cooling, the organic phase was separated, the aqueous phase extracted with dichloromethane (20 ml) and the combined organic phases dried over sodium sulphate, filtered and evaporated to dryness. The resultant crude product (690 mg) was chromatographed on silica gel (4.0×15 cm) with methanol/ethyl acetate (V:V=1:1). 530 mg of the non-polar diastereoisomer of 3-(2-chlorophenyl)-5-methylisoxazole-4-carboxylic acid [4-dimethylamino-4-(3-fluorophenyl)cyclohexyl]amide were obtained, which, dissolved in 50 ml 2-butanone were converted overnight into the corresponding hydrochloride by adding 21 μl water and 150 μl chlorotrimethylsilane, then evaporating to dryness, and stirring with 10 ml ethyl acetate (380 mg, Mp. 231-232° C.).

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