(3S,10R,13S,17S)-17-(1-Hydroxy-2-methoxy-ethyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene-3,17-diol 、
丙酮 在
对甲苯磺酸 作用下,
反应 10.0h,
生成 (1R,2S,3'S,10'R,13'R)-3',4,4,10',13'-pentamethyl-2-propyl-1',2',3',4',7',8',9',10',11',12',13',16'-dodecahydrospiro[cyclopentane-1,17'-cyclopenta[a]phenanthrene]