ethyl 5-[(diethylamino)methylene]-2-(p-methoxybenzyl)-3-methyl-4-oxo-4,5,6,7-tetrahydro-2H-isoindole-1-carboxylate 、
丙二酸二甲酯 在
哌啶 作用下,
反应 24.0h,
以42%的产率得到7-ethyl 3-methyl 8-(p-methoxylbenzyl)-9-methyl-2-oxo-2,5,6,8-tetrahydropyrano[2,3-e]isoindole-3,7-dicarboxylate