异戊酰氯 、
4'R-O-(-)-camphanoyl-3'R-hydroxy-2',2'-dimethyl-2-ethoxymethyldihydropyrano[2,3-f]chromone 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
生成 4'S-O-(-)-camphanoyl-3'S-O-isovaleryl-2',2'-dimethyl-2-ethoxymethyldihydropyrano[2,3-f]chromone 、 4'R-O-(-)-camphanoyl-3'R-O-isovaleryl-2',2'-dimethyl-2-ethoxymethyldihydropyrano[2,3-f]chromone