(5aS,5bR,7aS,11aS,11bR,13R,13aS)-3,5b,8,8,11a,13a-Hexamethyl-5a,5b,6,7,7a,8,9,10,11,11a,11b,12,13,13a-tetradecahydro-2-oxa-cyclopenta[a]chrysen-13-ol 在
chromium trioxide-pyridine complex 作用下,
以
吡啶 、
二氯甲烷 为溶剂,
反应 6.0h,
以53 mg的产率得到(5aS,5bR,7aS,11aS,11bR,13aS)-3,5b,8,8,11a,13a-Hexamethyl-5a,6,7,7a,8,9,10,11,11a,11b,12,13a-dodecahydro-5bH-2-oxa-cyclopenta[a]chrysen-13-one