(3β,5α,11β,12β,25R)-3-(t-butyldimethylsilyloxy)-11-(trimethylsilyloxy)spirostan-12-ol 、
吡啶 在
chromium (VI) trioxide 作用下,
以
二氯甲烷 为溶剂,
以, 1976, 55, 84 to give the title compound的产率得到(3β,5α,11β,25R)-3-(t-butyldimethylsilyloxy)-11-(trimethylsilyloxy)spirostan-12-one