5-chloro-thiophene-2-carboxylic acid ((3S,4S)-4-hydroxy-pyrrolidin-3-yl)-amide hydrochloride 、
溴乙酸乙酯 以to give {(3S,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-hydroxy-pyrrolidin-1-yl}-acetic acid ethyl ester的产率得到{(3S,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-hydroxy-pyrrolidin-1-yl}-acetic acid ethyl ester