Studies on Heterocyclic Enamines: New Synthesis of Pyrano[2,3-b]pyndine, Pyrano[2,3-d]pyrimidine and Pyrano[2,3-c]pyrazole Derivatives

Abstract

A variety of novel pyrano[2,3-d]pyrimidines could be obtained via reaction of ethyl 2-amino- 3-cyano-6-methylpyran-4-carboxylate with a variety of reagents. Evidence for the existance of this pyran derivative as a ring chain tautom er is presented.