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This paper describes a convenient and efficient synthesis of new fused tricyclic diazepino[3,2,1-ij]
quinolines and substituted pyrido[1,2,3-de]quinoxalines. o-Phenylenediamines are transformed in the
tricycle nucleus in only a few-step synthetic sequence to produce ethyl 2,8-dioxo-1,2,3,4-tetrahydro-8H
[1,4]diazepino[3,2,1-ij]quinoline-7-carboxylate, ethyl 8-oxo-1,2,3,4-tetrahydro-8H-[1,4]diazepino[3,2,1-ij]
quinoline-7-carboxylate and ethyl 2,7-dioxo-2,3-dihydro-1H,7H-pyrido[1,2,3-de]quinoxaline-6-carboxylate.
The method is economical and simple to perform
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