Heterodiene Synthesis. I. Reaction of 5-Arylidenerhodanine Derivatives with 1-Morpholinocyclohexene Enamine

Abstract

Cycloaddition of 5-arylidenerhodanine derivatives l_a-d as α, β unsaturated carbonyl system attached to a heterocyclic nucleus with enamine E as an electron rich dienophile lead to 3,4-dihydro-2H-pyrans 2_a-d. The results differed depending on the nature of the substituent of the arylidene group. The introduction of an electron-withdrawing group in the p-position of arylidene moiety should increase the facility of the reaction.