S. Yamaguchi et al., ISOPROPENYLIDHYDROFURAN DERIVATIVES - PREPARATION AND REACTIONS OF SOME ISOPROPENYLIDHYDROFURANDICARBOXYLATES, Journal of heterocyclic chemistry, 34(4), 1997, pp. 1329-1334
Diethyl 5-isopropenyl-4,5-dihydrofuran-2,3-dicarboxylate 1a and methyl
5-isopropenyl-3 -methoxy-carbonyl-4,5-dihydrofuran-2-acetate 2a were
prepared by cylization of diethyl 2-oxosuccinate or dimethyl 3-oxoglut
arate with (E)-1,4-dibromo-2-methyl-2-butene. Their chemical propertie
s were studied.