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RESEARCH ARTICLE
Contents Vol 70(10)

Friedel–Crafts Chemistry. Part 48. Concise Synthesis of Condensed Azaheterocyclic [1,8]naphthyridinones, Azepino-, Azocino-, and Azoninoquinoline Systems via Friedel–Crafts Ring Closures

Hassan A. K. Abd El-Aal
+ Author Affiliations
- Author Affiliations

A Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt. Email: hassankotb33@yahoo.com

Australian Journal of Chemistry 70(10) 1082-1092 https://doi.org/10.1071/CH17108
Submitted: 20 February 2017  Accepted: 5 May 2017   Published: 6 June 2017

Abstract

Unprecedented construction of a novel series of quinoline heteropolycycles (tetracyclic keto-analogues of [1,8]naphthyridinones, azepino-, azocino- and azonino[2,3-b]quinolinones systems) 10a–i by Friedel–Crafts cycliacylation reactions is described. Starting heterocyclic acids precursors 3a–i were prepared from easily accessible 2-chloroquinoline-3-carbaldehyde 1 via a three different synthetic pathways. Acid-catalyzed ring closures of the resulting tosylated acids were achieved under the influence of both Brønsted and Lewis acid catalysts. The present strategy enables a straightforward synthesis to fused tetracyclic quinolinone skeletons as demonstrated by concise and atom-economical syntheses.


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