Synthesis of New Furo[2,3-b]pyridine and Furo[3,2-d]pyrimidine Derivatives

Abstract

New furo[2,3-b]pyridine and pyrido[3′,2′:4,5]furo[3,2-d]pyrimidine derivatives were synthesized from ethyl 5-alkyl-1-amino-6,7,8,9-tetrahydrofuro[2,3-c]isoquinoline-2-carboxylates. Reactions of ethyl 5-alkyl-1-[(aminoacetyl)amino]-6,7,8,9-tetrahydrofuro[2,3-c]isoquinoline-2-carboxylates with hydrazine hydrate in¬volved not only cyclization but also hydrazinolysis and elimination of the acyl group.