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One-pot synthesis of new 3-substituted coumarins by tandem reactions

✍ Scribed by Khadidja Bourahla; Mustapha Rahmouni; Joan Fraga-Dubreuil; Jean Pierre Bazureau; Jack Hamelin

Publisher
Journal of Heterocyclic Chemistry
Year
2007
Tongue
English
Weight
406 KB
Volume
44
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

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The synthesis of new 3‐substituted coumarins appended to imidazolium, pyridinium, 3‐dimethylamino pyridinium, 3‐chloro pyridinium and 3‐bromo pyridinium salts is reported. These salts were prepared by tandem reactions, followed by quantitative anionic metathesis. The structure of these new 3‐substituted coumarins was established by NMR (^1^H, ^13^C) and high‐resolution mass spectrometry.

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One pot synthesis of diarylpyrido[3,2-c]
One pot synthesis of diarylpyrido[3,2-c]coumarins
✍ Shashi U. Pandya; Urvish R. Pandya; Bhanu R. Hirani; Dinker I. Brahmbhatt 📂 Article 📅 2006 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 230 KB 👁 1 views

## Abstract magnified image Various diarylpyrido[3,2‐__c__]coumarins **3a‐l** have been synthesized in one step by reacting 4‐hydroxy coumarins **1a‐d** with α,β‐unsaturated ketones **2a‐c** in the presence of ammonium acetate and acetic acid under Kroehnke's reaction conditions.