Microwave Synthesis of Arylmethyl Substituted Pyrazoles

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Microwave Synthesis of Arylmethyl Substituted Pyrazoles

The synthesis under MW irradiation without solvent of 19 pyrazoles, of which only 8 were known, is described. They bear C-methyl groups and trityl, diphenylmethyl and benzyl groups at positions 1 and 4 of the pyrazole ring. In the reaction between pyrazole and trityl bromide an unexpected reaction occurred and 4-(9-phenyl-9H-fluoren-9-yl)-1Hpyrazole (7) was isolated.

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Synthesis of 1,3,5-tri-substituted pyrazoles promoted by P2O5.SiO2

Silica supported phosphorus pentoxide (P2O5·SiO2) is an efficient catalyst for synthesis of 1,3,5-substituted pyrazoles via the condensation of 1,3-diketones and hydrazines. Simplicity of procedure, mild condition, being solvent-free, high yields, and easy workup are some advantages of this protocol.

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Synthesis of 1,3,5-tri-substituted pyrazoles promoted by P2O5.SiO2

Silica supported phosphorus pentoxide (P2O5·SiO2) is an efficient catalyst for synthesis of 1,3,5-substituted pyrazoles via the condensation of 1,3-diketones and hydrazines. Simplicity of procedure, mild condition, being solvent-free, high yields, and easy workup are some advantages of this protocol.

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synthesis of 1,3,5-tri-substituted pyrazoles promoted by p2o5.sio2

silica supported phosphorus pentoxide (p2o5·sio2) is an efficient catalyst for synthesis of 1,3,5-substituted pyrazoles via the condensation of 1,3-diketones and hydrazines. simplicity of procedure, mild condition, being solvent-free, high yields, and easy workup are some advantages of this protocol.

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Microwave-assisted multi-component synthesis of indol-3-yl substituted pyrano[2,3-c]pyrazoles and their antimicrobial activity

A series of pyrano[2,3-c]pyrazole derivatives of indole was synthesized by multi-component reactions using the conventional and microwave irradiation approach. Particularly valuable features of this method include high yield, broad substrate scope, shorter reaction times and straightforward procedure. Antimicrobial screening of the synthesized derivatives against eight human pathogens, namely B...

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ژورنال

عنوان ژورنال: The Open Organic Chemistry Journal

سال: 2008

ISSN: 1874-0952

DOI: 10.2174/1874095200801020010