(3R,4S)-3-aminomethyl-4-methoxy-pyrrolidine-1-carboxylic acid tert-butyl ester acetate 、
2-氯噻吩-5-甲酸 以to give (3R,4S)-3-{[(5-chloro-thiophene-2-carbonyl)-amino]-methyl}-4-methoxy-pyrrolidine-1-carboxylic acid tert-butyl ester的产率得到(3R,4S)-3-{[(5-chloro-thiophene-2-carbonyl)-amino]-methyl}-4-methoxy-pyrrolidine-1-carboxylic acid tert-butyl ester