(6E,10Z)-10-Cyano-2,6-dimethyl-3-oxo-hexadeca-6,10,15-trienoic acid ethyl ester 在
copper diacetate 、 manganese triacetate 、
溶剂黄146 作用下,
以60%的产率得到(1S,4aS,4bS,8aR,10aS)-8a-Cyano-1,4a-dimethyl-8-methylene-2-oxo-tetradecahydro-phenanthrene-1-carboxylic acid ethyl ester