tert-Butyl-[(3S,8R,9S,10R,13S,14S)-17-((S)-1-[1,3]dioxolan-2-yl-ethyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-3-yloxy]-dimethyl-silane 在
吡啶 、
四氧化锇 作用下,
以
乙醚 为溶剂,
以83%的产率得到(3S,8R,9S,10R,13S,14S,16R,17S)-3-[tert-butyl(dimethyl)silyl]oxy-17-[(1S)-1-(1,3-dioxolan-2-yl)ethyl]-10,13-dimethyl-1,2,3,4,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthrene-16,17-diol