(2S,4aR,4bS,6aS,6bS,10aS,11aS,11bR,13S,13aS)-4a,6a-Dimethyl-2-(tetrahydro-pyran-2-yloxy)-icosahydro-10-oxa-indeno[2,1-a]phenanthrene-7,13-diol 在
chromium trioxide-pyridine complex 作用下,
以
吡啶 为溶剂,
以100 mg的产率得到(2S,4aR,4bS,6aS,6bR,10aS,11aS,11bR,13aS)-4a,6a-Dimethyl-2-(tetrahydro-pyran-2-yloxy)-octadecahydro-10-oxa-indeno[2,1-a]phenanthrene-7,13-dione