重氮甲烷 、
乙酸酐 、
(+)-ent-Epicatechin-(4α,4)-resorcinol 在
吡啶 作用下,
生成
(2R,3S,4R)-2,3-trans-3,4-trans-3-acetoxy-3',4',5,7-tetramethoxy-4-(2,4-dimethoxyphenyl)flavan 、 Acetic acid (2S,3S,4S)-4-(2,4-dimethoxy-phenyl)-2-(3,4-dimethoxy-phenyl)-5,7-dimethoxy-chroman-3-yl ester 、
Acetic acid (2R,3S,4R)-4-(3,4-dimethoxy-phenyl)-2-(2,4-dimethoxy-phenyl)-5,7-dimethoxy-chroman-3-yl ester 、 (2S,3S,4R)-3-acetoxy-3',4',7-trimethoxy-4β-(2,4,6-trimethoxyphenyl)flavan