Trifluoro-methanesulfonic acid (4aR,4bS,6aS,8R,10aS,10bR)-8-hydroxy-4a,6a,8-trimethyl-7-oxo-3,4,4a,4b,5,6,6a,7,8,9,10,10a,10b,11-tetradecahydro-chrysen-2-yl ester 在
甲酸 、 bis(triphenylphosphine) palladium (Il) acetate 、
三正丁胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以93%的产率得到(2R,4aS,4bR,10aR,10bS,12aS)-2-Hydroxy-2,10a,12a-trimethyl-3,4,4a,4b,5,9,10,10a,10b,11,12,12a-dodecahydro-2H-chrysen-1-one