(R)-4-((3R,5R,8R,9S,10S,12S,13R,14S,17R)-3-tert-Butoxycarbonylamino-12-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-pentanoic acid 在
五氟苯酚 、
N,N'-二环己基碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 12.0h,
以32%的产率得到(1R,4R,5S,7S,8R,9S,12R,13R,18R,21S,22R,25R,26S,28S,29R,30S,33R,34R,39R,42S)-7,28-dihydroxy-8,13,21,29,34,42-hexamethyl-17,38-diazanonacyclo[37.3.1.118,22.04,9.05,42.08,12.021,26.025,30.029,33]tetratetracontane-16,37-dione