difluoromethyl-diphenyl-phosphine oxide 、 (3aR,5aS,10R)-10-Methoxy-3a,5a-dimethyl-tetradecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-one 在
lithium diisopropyl amide 作用下,
生成
(3aR,5aS,10R)-6-Difluoromethylene-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalene