3-(氯磺酰基)丙酸甲酯 、
(3β,18β,20β)-3-amino-11-oxo-olean-12-en-29-oic acid diphenylmethyl ester 在
三乙胺 作用下,
以
二氯甲烷 为溶剂,
以77.1%的产率得到benzhydryl (2S,4aS,6aS,6bR,8aR,10S,12aS,12bR,14bR)-10-((3-methoxy-3-oxopropyl)sulfonamido)-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydropicene-2-carboxylate