4,8-二氧杂螺[2,5]辛-1-烯 、
methyl 9-bromo-5,6-dihydro-7,10-dimethoxy-2-oxo-2H-naphtho<1,2-b>pyran-3-carboxylate 以
苯 为溶剂,
反应 3.0h,
以70%的产率得到Methyl 4'-bromo-3',6'-dimethoxy-16'-oxospiro[1,3-dioxane-2,14'-17-oxatetracyclo[8.7.0.02,7.011,15]heptadeca-1(10),2(7),3,5,12-pentaene]-15'-carboxylate