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Synthesis 2008(21): 3478-3486
DOI: 10.1055/s-0028-1083169
DOI: 10.1055/s-0028-1083169
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis of Pyrazoles, Diazepines, Enaminones, and Enamino Esters Using 12-Tungstophosphoric Acid as a Reusable Catalyst in Water
Further Information
Publication History
Received
4 June 2008
Publication Date:
16 October 2008 (online)


Abstract
12-Tungstophosphoric acid (H3PW12O40) is found to be an efficient and recyclable catalyst in promoting a chemo- and regioselective condensation of hydrazines/hydrazides, diamines, and primary amines with various 1,3-dicarbonyl compounds in pure water at room temperature to afford pyrazoles, diazepines, and enaminones/enamino esters, respectively, in high yields.
Key words
12-tungstophosphoric acid - recyclable catalyst - condensation - 1,3-dicarbonyl compounds - aqueous medium