Synlett

Synthesis of pyrazoles by a one-pot tandem cyclization-dehydrogenation approach on Pd/C/K-10 catalyst

SM Landge, A Schmidt, V Outerbridge, B Toeroek

Index: Landge, Shainaz M.; Schmidt, Allison; Outerbridge, Verona; Toeroek, Bela Synlett, 2007 , # 10 p. 1600 - 1604

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Citation Number: 36

Abstract

Abstract A novel one-pot synthesis of substituted pyrazoles from chalcones and hydrazines via a tandem cyclization-dehydrogenation approach is described. This process is based on the use of a bifunctional noble-metal/solid-acid catalyst, Pd/C/K-10 montmorillonite and microwave irradiation under solvent-free conditions. The cyclization of chalcones with hydrazines readily takes place on the strong solid acid while the presence of the metal ...