1-((3S,5R,6R,10S,13R,14R,17S)-3,6-Dihydroxy-4,4,10,13,14-pentamethyl-2,3,4,5,6,7,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-ethanone 在
吡啶 、
三氯氧磷 作用下,
生成
1-((1S,3aR,8aR,10aR)-6-Isopropylidene-3a,8a,10a-trimethyl-1,2,3,3a,4,6,7,8,8a,9,10,10a-dodecahydro-dicyclopenta[a,f]naphthalen-1-yl)-ethanone