TFA*ProIleAsp(OBzl)2 、
methyl (3S,11S)-11-[(1R,9R,10S,11R,12R,19R)-11-acetyloxy-12-ethyl-10-hydroxy-5-methoxy-10-methoxycarbonyl-8-methyl-8,16-diazapentacyclo[10.6.1.01,9.02,7.016,19]nonadeca-2,4,6,13-tetraen-4-yl]-4,6-dioxo-5-oxa-7,13-diazatetracyclo[10.7.0.03,7.014,19]nonadeca-1(12),14,16,18-tetraene-11-carboxylate 在
N-甲基吗啉 作用下,
以
乙腈 为溶剂,
以40%的产率得到dibenzyl (2S)-2-[[(2S,3S)-2-[[(2S)-1-[(2S,7S)-7-[(1R,9R,10S,11R,12R,19R)-11-acetyloxy-12-ethyl-10-hydroxy-5-methoxy-10-methoxycarbonyl-8-methyl-8,16-diazapentacyclo[10.6.1.01,9.02,7.016,19]nonadeca-2,4,6,13-tetraen-4-yl]-7-methoxycarbonyl-2,3,4,5,6,8-hexahydro-1H-azonino[5,4-b]indole-2-carbonyl]pyrrolidine-2-carbonyl]amino]-3-methylpentanoyl]amino]butanedioate