乙酸酐 、 (2S,3R,4S,2'R,3'S)-2,2'-Bis-(3,4-dimethoxy-phenyl)-7,5',7'-trimethoxy-3,4,3',4'-tetrahydro-2H,2'H-[4,6']bichromenyl-3,3'-diol 在
吡啶 作用下,
生成
(2S,3R,4S)-2,3-trans-3,4-cis-3-acetoxy-4-<(2R,3S)-2,3-trans-3-acetoxy-3',4',5,7-tetramethoxyflavan-6-yl>-3',4',7-trimethoxyflavan