(1R,4aR,4bS,8aS,9R,10aR)-9-Ethoxycarbonylmethyl-9-hydroxy-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,6,8a,9,10,10a-dodecahydro-phenanthrene-1-carboxylic acid methyl ester 在
三氯氧磷 作用下,
以
吡啶 为溶剂,
反应 18.0h,
以67%的产率得到(1R,4aR,4bS,8aS,10aR)-9-[1-Ethoxycarbonyl-meth-(E)-ylidene]-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,6,8a,9,10,10a-dodecahydro-phenanthrene-1-carboxylic acid methyl ester