乙酸酐 、 (1S,4RS,4aR,4bR,7R,8aS,10aR)-7-tert-butyldimethylsilyloxy-1,4,4a,4b,5,6,7,8,8a,9,10,10a-dodecahydro-1,4b,8,8-tetramethyl-2-vinylphenanthren-4-ol 在
4-二甲氨基吡啶 作用下,
以
吡啶 为溶剂,
反应 7.0h,
以100%的产率得到(1S,4R,4aR,4bR,7R,8aS,10aR)-4-acetoxy-7-tert-butyldimethylsilyloxy-1,4,4a,4b,5,6,7,8,8a,9,10,10a-dodecahydro-1,4b,8,8-tetramethyl-2-vinylphenanthrene