乙酸酐 、
affinogenin D-III 以
吡啶 为溶剂,
反应 0.67h,
以20 mg的产率得到Acetic acid (2S,3S,5R,8R,9S,10S,13R,14S)-2,14-dihydroxy-10,13-dimethyl-11-oxo-17-(5-oxo-2,5-dihydro-furan-3-yl)-2,3,4,5,6,7,8,9,10,11,12,13,14,15-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester