(1R,2S)-1-氨基-2-乙烯基-环丙羧酸乙酯盐酸盐(1:1) 、 1-(2(S)-tert-butoxycarbonylamino-non-8-enoyl)-4(R)-benzyloxy-pyrrolidine-2(S)-carboxylic acid methyl ester 以90%的产率得到1-{[1-(2(S)-tert-butoxycarbonylamino-non-8-enoyl)-4(R)-benzyloxypyrrolidine-2(S)carbonyl]-(1R)-amino}-2(S)-vinyl-cyclopropanecarboxylic acid ethyl ester