Pyrazoles and Tetrahydroindazoles may be prepared by condensation of 1,3-diones and hydrazines under layered zirconium sulfophenyl phosphonate catalysis, in solvent free conditions.The important features of this method are: mild reaction condition, good regioselectivity, simple work-up and recyclable nature of the catalyst employed.
Layered Zirconium Sulfophenyl Phosphonate as Heterogeneous Catalyst in the Synthesis of Pyrazoles and 4,5,6,7-tetrahydro-1(2)H-indazoles.
CURINI, Massimo;ROSATI, Ornelio;
2005
Abstract
Pyrazoles and Tetrahydroindazoles may be prepared by condensation of 1,3-diones and hydrazines under layered zirconium sulfophenyl phosphonate catalysis, in solvent free conditions.The important features of this method are: mild reaction condition, good regioselectivity, simple work-up and recyclable nature of the catalyst employed.File in questo prodotto:
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