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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

By Pier Giovanni Baraldi, Emanuela Ruggiero and Mojgan Aghazadeh Tabrizi

Abstract

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

Topics: Organic Chemistry
Year: 2014
DOI identifier: 10.1002/jhet.1594
OAI identifier: oai:iris.unife.it:11392/2339444
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