在
钯 作用下,
反应 2.5h,
以89%的产率得到Carbonic acid (1S,3R,9S,10R,13R,14R,17R)-17-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-1-methoxycarbonyloxy-10,13-dimethyl-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl ester methyl ester