Simple and one-pot synthesis of new heterocyclic compounds in three-component reactions between isoquinoline or phenanthridine and acetylenic esters in the presence of N-heterocycles or 1,3-dicarbonyl compounds

Abstract

A new class of enamino esters has been isolated in excellent yields from the 1:1:1 addition reaction between phenanthridine or isoquinoline and acetylenic esters such as ethyl propiolate or dialkyl acetylenedicaboxylates in the presence of heterocyclic NH compounds (succinimide, indole, 2-methylindole, 2-benzoxazolinone, 6-chlorobenzoxazolinone, carbazole and 3,6-dibromocarbazole) or 1,3-dicarbonyl compounds like 1,3-dimethylbarbituric acid, acetylacetone and dibenzoylmethane.