碘甲烷 、 (4aR,4bR,10bR,12R,12aS)-12-(tert-Butyl-dimethyl-silanyloxy)-7-methoxymethoxy-4a,9,10b-trimethyl-1,4a,4b,6,10b,11,12,12a-octahydro-4H-chrysen-5-one 在
lithium diisopropyl amide 、
六甲基磷酰三胺 作用下,
以
四氢呋喃 为溶剂,
以91%的产率得到(4aR,4bR,6R,10bR,12R,12aS)-12-(tert-Butyl-dimethyl-silanyloxy)-7-methoxymethoxy-4a,6,9,10b-tetramethyl-1,4a,4b,6,10b,11,12,12a-octahydro-4H-chrysen-5-one