ETHYL 2-(2-ACETYL-2-ETHOXYCARBONYL-1-ETHENYL)AMINO-3-DIMETHYLAMINOPROPENOATE IN THE SYNTHESIS OF HETEROCYCLIC SYSTEMS.THE SYNTHESIS OF SUBSTITUTED 3-AMINOAZOLO-AND-AZLNOPYRIMIDINONES,PYRIDOPYRIDINOES AND PYRANONES

摘要

Abstract-Ethyl 2-(2-acetyl-2-ethoxycarbonyl-1-ethenyl)amino-3-dimethylamino-propenoate (2) was prepared from ethyl N-(2-acetyl-2-ethoxycarbonyl-1-ethenyl)-glycynate (1)and N,N-dimethylformamide dimethyl acetal ,and used as a reagent for preparation of substituted amino azolo-and azinopyrimidin-4-ones (16-20),quinolizin-4-ones (31 and 32),2H-1-benzopyran-2-ones(33),and isomeric naph-thopyranones (34-37),2H-pyrano[2,1-b]pyridine-2,5-dione (38) ,pyrano[4,5-b]-pyran-2,5-dione (39) pyrano[3,2-c]bezopyran-2,5-dione (40).