(S)-2-[(3S,8R,9S,10R,13S,14S,17S)-3-(tert-Butyl-dimethyl-silanyloxy)-17-hydroxy-10,13-dimethyl-16-oxo-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-propionic acid dodecyl ester 在
sodium tetrahydroborate 、 cerium(III) chloride 作用下,
以
四氢呋喃 为溶剂,
以87%的产率得到(S)-2-[(3S,8R,9S,10R,13S,14S,16S,17S)-3-(tert-Butyl-dimethyl-silanyloxy)-16,17-dihydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-propionic acid dodecyl ester