rac-methyl (4aR,5S,12aS)-4a-hydroxy-6,11-dimethoxy-5-(phenylsulfonyl)-4,4a,5,12-tetrahydro-1H-spiro[tetracene-2,2'-[1,3]dioxolane]-12a(3H)-carboxylate 在
盐酸 作用下,
以
四氢呋喃 为溶剂,
反应 5.0h,
以95%的产率得到6,11-dimethoxy-4a-hydroxy-12a-(methoxycarbonyl)-2-oxo-5-(phenylsulfonyl)-1,2,3,4,4a,5,12,12a-octahydronaphthacene