methyl 8-hydroxy-3-(4-hydroxy-3,5-dimethoxyphenyl)-2-hydroxymethyl-2,3-dihydrobenzo[1,4]dioxane-6-carboxylic acid 在
吡啶 、 aluminum (III) chloride 作用下,
反应 1.0h,
以97.5%的产率得到methyl 3-(3,4-dihydroxy-5-methoxyphenyl)-8-hydroxy-2-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxine-6-carboxylate