✦ LIBER ✦

One-pot synthesis of 2-amino-3-cyano-4-arylsubstituted tetrahydrobenzo[b]pyrans catalysed by silica gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and reusable catalyst

✍ Scribed by Abolghasem Davoodnia; Sadegh Allameh; Samineh Fazli; Niloofar Tavakoli-Hoseini

Book ID: 111491500
Publisher: Versita
Year: 2011
Tongue: English
Weight: 255 KB
Volume: 65
Category: Article
ISSN: 0366-6352
DOI: 10.2478/s11696-011-0064-8

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✦ Synopsis

Abstract

A convenient method for the synthesis of tetrahydrobenzo[b]pyrans by a one-pot three-component cyclocondensation of dimedone, aryl aldehydes, and malononitrile in water using silica gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and reusable catalyst is described. The present methodology offers several advantages, such as a simple procedure with ease of handling, short reaction time, high yields, and the absence of any volatile and hazardous organic solvents.

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