Addition of dimethyl acetylenedicarboxylate to 4-(pyrrolidin-1-yl)coumarin and to 1-methyl-4-(pyrrolidin-1-yl)quinolin-2(1H)-one
Abstract
Addition of dimethyl acetylenedicarboxylate to 4-(pyrrolidin-1-yl)coumarin and to 1-methyl-4-(pyrrolidin-1-yl)-quinolin-2(1H)-one affords dimethyl 2-oxo-6-(pyrrolidin-1-yl)-1-benzoxocin-4,5-dicarboxylate and dimethyl 1,2-dihydro-1-methyl-2-oxo-6-(pyrrolidin-1-yl)-1-benzazocine-4,5-dicarboxylate, respectively, in moderate yield.