(5R,10S)-14-Hydroxy-13-methyl-1,7,17-trioxo-1,2,3,4,5,6,7,11,12,13,14,15,16,17-tetradecahydro-cyclopenta[a]phenanthrene-10-carboxylic acid methyl ester 、
叔丁基二甲基氯硅烷 在
咪唑 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 52.0h,
以25.0 mg的产率得到(5R,10S,13S,14S)-7-(tert-Butyl-dimethyl-silanyloxy)-14-hydroxy-13-methyl-1,17-dioxo-1,2,3,4,5,6,12,13,14,15,16,17-dodecahydro-cyclopenta[a]phenanthrene-10-carboxylic acid methyl ester