反应详情

A stirred solution of (S)-2-(t-butoxycarbonylamino)-3-(biphenyl-4-yl)-propionic acid benzyl ester (3.95 g, 9.15 mmol) in ethyl acetate (40 mL) under nitrogen is cooled to 0° and treated with hydrochloric acid gas (4 g). A precipitate appears and the mixture is warmed to room temperature and stirred for 1 hour. Ether (25 mL) is added and the solid is filtered off and briefly dried under high vacuum for 1 hour. (S)-2-amino-3-(biphenyl-4-yl)-propionic acid benzyl ester hydrochloride is obtained as white solid, [α]D =-21.14 (c 0.92, MeOH).

1. filtrationthe solid is filtered off
2. custombriefly dried under high vacuum for 1 hour