Studies on 1-Alkyl-2(1H)-pyridone Derivatives. XXXI. : Syntheses of Isoquinoline Derivatives Using Diels-Alder Reactions of 4-Acetyl-, 4-Cyano-, and 4-Methoxycarbonyl-1-methyl-2(1H)-pyridones with 1, 3-Butadiene Derivatives

Abstract

The Diels-Alder reactions of 4-cyano, 4-methoxycarbonyl-, and 4-acetyl-2(1H)-pyridones (I, II, and IV) with 1, 3-butadiene derivatives (III and V) were carried out to give 4a-substituted tetrahydro-1(2H)-isoquinolone derivatives (VI-IX, XV, XIX, and XX).