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Communication | Regular issue | Vol 20, No. 9, 1983, pp.1721-1725
Published online, 1st January, 1970
DOI: 10.3987/R-1983-09-1721
A Synthesis of Pyrido[1,2-a]quinoxalines and Pyrido[1,2-a]pyrazines

Norio Kawahara, Takako Nakajima, Tsuneo Itoh, and Haruo Ogura

*Hokkaido College of Pharmacy, 7-1 Katsuraoka-cho, Otaru 047-02, Japan


o-Phenylenediamines and 1,2-diamines reacted with dimethyl acetylenedicarboxylate (DMAD) to afford trimethyl 3-oxo-1,2,3,4-tetrahydroquinoxaline-Δ2,γ-aconitates and trimethyl 3-oxo-piperazine-Δ2,γ-aconitates which were converted to pyrido-[1,2-a]quinoxalines and pyrido[1,2-a]pyrazines, respectively, by thermal or photochemical reactions.