methyl (20E)-3β-hydroxy-5α-pregn-20-ene-21-carboxylate 在
吡啶 、 molecular sieve 、 silver silicate 、
sodium methylate 作用下,
反应 23.0h,
生成 (E)-3-[(3S,5S,8R,9S,10S,13R,14S,17R)-10,13-Dimethyl-3-((2R,3R,4S,5S,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-hexadecahydro-cyclopenta[a]phenanthren-17-yl]-acrylic acid methyl ester