(3S,4S)-3-amino-4-methoxy-cyclopentanecarboxylic acid methyl ester 、
2-氯噻吩-5-甲酸 在
silica gel 、
环己烷 作用下,
以to give (1R,3S,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-methoxy-cyclopentanecarboxylic acid methyl ester and (1S,3S,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-methoxy-cyclopentanecarboxylic acid methyl ester的产率得到(1R,3S,4S)-3-[(5-chloro-thiophene-2-carbonyl)-amino]-4-methoxy-cyclopentanecarboxylic acid methyl ester