Tetrahedron letters

A mild and efficient method for halogenation of 3, 5-dimethyl pyrazoles by ultrasound irradiation using N-halosuccinimides

HA Stefani, CMP Pereira, RB Almeida, RC Braga…

Index: Stefani, Helio A.; Pereira, Claudio M. P.; Almeida, Roberta B.; Braga, Rodolpho C.; Guzen, Karla P.; Cella, Rodrigo Tetrahedron Letters, 2005 , vol. 46, # 40 p. 6833 - 6837

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Citation Number: 74

Abstract

The 4-halo-3, 5-dimethyl pyrazoles have been synthetisized in good yields in short reaction times in the absence of a catalyst by reaction of 3, 5-dimethyl pyrazoles with N- halosuccinimides (NBS, NCS and NIS) under ultrasound irradiation. Finally, the halogenation of pyrazoles with Br2, ICl and I2 was showed in similar conditions.