(4S,5S,8R,9S,10R,13S,14S)-4-Benzoyl-17-(tert-butyl-dimethyl-silanyloxy)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-one 在
lithium tetrafluoroborate 作用下,
以
二氯甲烷 、
乙腈 为溶剂,
以78%的产率得到(4S,5S,8R,9S,10R,13S,14S,17S)-4-Benzoyl-17-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-one