Acetic acid (5R,8R,9S,10S,13S,14S)-10,13-dimethyl-17-(11-methyl-7-oxa-1,5-dithia-spiro[5.5]undec-8-en-9-yl)-12-oxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester 在
copper(II) oxide 、 copper dichloride 作用下,
以
水 、
丙酮 为溶剂,
反应 22.0h,
以78%的产率得到Acetic acid (5R,8R,9S,10S,13S,14S)-10,13-dimethyl-17-(5-methyl-6-oxo-5,6-dihydro-4H-pyran-3-yl)-12-oxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester