(3S,3aS,7S,10aS,12bS)-7-(tert-butyldiphenylsilyloxy)-10a-hydroxy-3-(methoxymethoxy)-3a-methyl-1,2,3,3a,4,8,9,10,10a,11,12,12b-dodecahydrobenzo[4,5]cyclohepta[1,2-e]inden-5(7H)-one 在
camphor-10-sulfonic acid 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以60%的产率得到(3S,3aS,5aS,7S,10aS,12aS,12bR)-7-(tert-butyldiphenylsilyloxy)-3-(methoxymethoxy)-3a-methyl-1,2,3,3a,4,7,8,9,10,11,12,12b-dodecahydro-10a,12a-epoxybenzo[4,5]cyclohepta[1,2-e]inden-5(5aH)-one