(1S,2S,4aS,8aR)-5,5,8a-Trimethyl-1-(2-naphthalen-1-yl-ethyl)-decahydro-naphthalene-2-carboxylic acid 在
甲烷磺酸 、 phosphorus pentoxide 作用下,
反应 5.0h,
以42%的产率得到(4aS,6aS,15aS,15bR)-4,4,15b-Trimethyl-1,2,3,4,4a,5,6,6a,14,15,15a,15b-dodecahydro-cyclohepta[1,2-a;5,4-a']dinaphthalen-7-one