(1R,4aS,4bR,6aS,8S,10aS,10bS,12aR)-8-(tert-Butyl-dimethyl-silanyloxy)-1-((R)-1,5-dimethyl-4-oxo-hexyl)-10a,12a-dimethyl-hexadecahydro-4-oxa-chrysen-3-one 在
亚甲基三苯基膦烷 作用下,
以
四氢呋喃 为溶剂,
以66%的产率得到(1R,6aS,6bR,8aS,10S,12aS,12bS,14aR,14bR)-10-(tert-Butyl-dimethyl-silanyloxy)-4-isopropyl-1,12a,14a-trimethyl-1,2,3,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14,14a,14b-octadecahydro-6-oxa-picen-5-one