Citric Acid → 2-[4-[((3S)-1-tert-butoxycarbonyl-3-pyrrolidinyl)oxy]phenyl]-3-(6-cyano-2-indolyl)propanol

Participants

Reaction Steps

2.7 g of methyl 2-[4-[((3S)-1-tert-butoxycarbonyl-3-pyrrolidinyl)oxy]phenyl]-3-(6-cyano-2-indolyl)propionate was dissolved in 30 ml of tetrahydrofuran, followed by the addition of 660 mg of sodium borohydride. 12 ml of methanol was added dropwise to the thus prepared solution while stirring under ice cooling, and the resulting mixture was stirred at room temperature for 3 hours. The resulting reaction solution was mixed with 10% citric acid aqueous solution, extracted with dichloromethane, and then dried. After distilling off the solvent, the resulting residue was purified by subjecting it to silica gel column chromatography using a dichloromethane/methanol mixture as an elution solvent. In this way, 2.2 g of the title compound was obtained in an oily form.

Provenance & Evidence