8-(tert-Butyl-dimethyl-silanyloxy)-4-[4-(tert-butyl-dimethyl-silanyloxy)-phenyl]-2-difluoromethylene-1,2,3,3a,4,9b-hexahydro-cyclopenta[c]chromene 在
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
反应 0.08h,
以89%的产率得到(3aS,4R,9bR)-2-difluoromethylene-4-(4-hydroxy-phenyl)-1,2,3,3a,4,9b-hexahydro-cyclopenta[c]chromen-8-ol