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Paper | Regular issue | Vol 45, No. 12, 1997, pp.2349-2356
Published online, 1st January, 1970
DOI: 10.3987/COM-97-7937
The Synthesis and Transformations of Methyl 2-[2,2-Bis(ethoxycarbonyl)-ethenyl]amino-3-dimethylaminobut-2-enoate. The Synthesis of 3-Amino-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-ones

Lovro Selic, Simona Golic Grdadolnik, and Branko Stanovnik*

*Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva 5, P.O. Box 537, SLO-1000 Ljubljana, Slovenia

Abstract

Methyl 2-[2,2-bis(ethoxycarbonyl)ethenyl]amino-3-dimethylaminobut-2-enoate (3) was prepared from methyl N-2,2-bis(ethoxycarbonyl)vinylglycinate (2) and DMADMA, and used as a reagent for the preparation of substituted 3-amino-2-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidines (13-17), 4H-benzothiazolo[3,2-a]pyrimidin-4-one (18), 5H-thiazolo[3,2-a]pyrimidin-5-one (19), and 4-methyl-tetrahydro-2H-1-benzopyran-2-ones (20) and (21).