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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 43, 2013 - Issue 3
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Original Articles

Catalytic Synthesis of Pyrazoles and Diazepines Under Green Conditions at Room Temperature Using Heteropolyacids Catalysts

, &
Pages 309-325 | Received 24 Mar 2011, Published online: 02 Nov 2012
 

Abstract

The catalytic performance of Preyssler, H14[NaP5W30O110]: Wells–Dawson, H6[P2W18O62]; and Keggin, H3[PW12O40] and H4[PMo11VO40], heteropolyacids as pure compounds have been studied in the synthesis of pyrazoles and diazepines in the condensation of hydrazines, hydrazides, and diamines with various 1,3-diketones. In all cases the best yields were obtained using H14[NaP5W30O110].

GRAPHICAL ABSTRACT

ACKNOWLEDGMENTS

The authors are thankful to the Agricultural Researches and Services Center, Mashhad, Feyzabad, Iran; Mashhad Islamic Azad University and Chemistry Department, University of Oslo, Norway and National Research Council Canada for support of this work.

Notes

a Yields are analyzed by GC.

b The reactions are carried out in water as solvent and at room temperature.

a Yields are analyzed by GC.

b The reactions are carried out in water as solvent and at room temperature.

a Yields are analyzed by GC.

b The reactions are carried out in water as solvent and at room temperature.

a Yields are analyzed by GC.

b The reactions are carried out in water as solvent and at room temperature.

a Isolated yields.

a Isolated yields.

a Isolated yields.

a Isolated yields.

a , b Isolated yields and yields obtained in the first, second, third, fourth and fifth reuse of the catalyst.

a Yield of 3,5-dimethyl-1-phenyl-1H-pyrazole.

b Yield of 2,4-dimethyl-3H-1,5-benzodiazepine.

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