乙酸酐 、 (2S,3R,4R,2'R,3'R)-2,2'-Bis-(3,4-dimethoxy-phenyl)-7,5',7'-trimethoxy-3,4,3',4'-tetrahydro-2H,2'H-[4,8']bichromenyl-3,3'-diol 在
吡啶 作用下,
以45 mg的产率得到(2S,3R,4R)-2,3-trans-3,4-trans-3-acetoxy-4-<(2R,3R)-2,3-cis-3-acetoxy-3',4',5,7-tetramethoxyflavan-8-yl>-3',4',7-trimethoxyflavan