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New synthesis of diazepino[3,2,1-ij]quinoline and pyrido[1,2,3-de] quinoxalines via addition-elimination followed by cycloacylation
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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Reference：
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N154 | ChemSpider