(2Z,6E)-3,7-Dimethyl-9-((1S,4aS,8aS)-5,5,8a-trimethyl-2-methylene-decahydro-naphthalen-1-yl)-nona-2,6-dienoic acid methyl ester 在
四氯化锡 作用下,
以
苯 为溶剂,
反应 1.0h,
以18%的产率得到(1R,4aS,4bR,6aS,10aS,10bR,12aS)-2,4b,7,7,10a,12a-Hexamethyl-1,4,4a,4b,5,6,6a,7,8,9,10,10a,10b,11,12,12a-hexadecahydro-chrysene-1-carboxylic acid methyl ester