REACTION OF METHYL 2-BENZOYLAMINO-3-DIMETHYLAMINOPROPENOATE WITH HETEROCYCLIC HYDROXY COMPOUNDS - THE SYNTHESIS OF FUSED PYRANOAZINES

Methyl 2-benzoylamino-3-dimethylaminopropenoate (1) reacts in acetic acid with monocyclic or bicyclic heterocyclic compounds with two hydroxy or potential hydroxy groups in 1,3-position to give fused pyranones. Accordingly, derivatives of 2H-pyrano[3,2-c]pyridine(3), 2H-pyrano[3,2-c]quinoline (9,10, and 11), 2H-pyrano[2,3-d]-pyridazine (13), 8H-pyrano[3,2-d]tetrazolo[1,5-b]pyridazine (16), pyrano[4,3-b]pyran (18), and 2H-pyrano[2,3-c]-pyridine (22) were obtained.