1-[(2'R,3S,3'S,4'R,6aS,6bS,9R,10aR,11aS,11bR)-3'-azido-4',11b-dimethyl-10-methylidene-3-phenylmethoxyspiro[1,2,3,4,6,6a,6b,7,8,10a,11,11a-dodecahydrobenzo[a]fluorene-9,5'-oxolane]-2'-yl]-3-[(4-methoxyphenyl)methoxy]propan-2-one 、
trimethylsilylmethyllithium 在
cerium(III) chloride 、
四甲基乙二胺 作用下,
以
四氢呋喃 、
正戊烷 为溶剂,
反应 0.25h,
以95%的产率得到(3S,3'R,4'S,5'R,6aS,6bS,9R,10aR,11aS,11bR)-4'-azido-3-(benzyloxy)-5'-(2-(((4-methoxybenzyl)oxy)methyl)allyl)-3',11b-dimethyl-10-methylene-1,2,3,4,4',5',6,6a,6b,7,8,10,10a,11,11a,11b-hexadecahydro-3'H-spiro[benzo[a]fluorene-9,2'-furan]