乙酸酐 、
[(2R)-3-[tert-butyl(dimethyl)silyl]oxy-2-hydroxypropyl] (1S,4aS,4bR,8aR,10aS)-2,4b,8,8,10a-pentamethyl-4,4a,5,6,7,8a,9,10-octahydro-1H-phenanthrene-1-carboxylate 在
吡啶 作用下,
反应 12.0h,
以91%的产率得到[(2R)-2-acetyloxy-3-[tert-butyl(dimethyl)silyl]oxypropyl] (1S,4aS,4bR,8aR,10aS)-2,4b,8,8,10a-pentamethyl-4,4a,5,6,7,8a,9,10-octahydro-1H-phenanthrene-1-carboxylate