重氮甲烷 、
[5-Carboxymethyl-4-(1-furan-3-yl-5,8a-dimethyl-3-oxo-3,4,6,7,8,8a-hexahydro-1H-isochromen-6-yl)-4-hydroxymethyl-2,2-dimethyl-tetrahydro-furan-3-yl]-acetic acid 以
二氯甲烷 、
乙酸乙酯 为溶剂,
生成 [4-(1-Furan-3-yl-5,8a-dimethyl-3-oxo-3,4,6,7,8,8a-hexahydro-1H-isochromen-6-yl)-4-hydroxymethyl-5-methoxycarbonylmethyl-2,2-dimethyl-tetrahydro-furan-3-yl]-acetic acid methyl ester