草酰氯 、
methyl (1S,2R,3aS,5R,6aR)-2-{[(2S)-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-3-(4-hydroxyphenyl)propanoyl]amino}-5-hydroxyoctahydropentalene-1-carboxylate 在
NNM 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以38%的产率得到methyl (6R,8S,9R,10S,11R,14S)-14-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-3,4,13-trioxo-2,5-dioxa-12-azatetracyclo[14.2.2.1
6,9.1
8,11]docosa-1(18),16,19-triene-10-carboxylate