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Note | Regular issue | Vol 65, No. 4, 2005, pp.865-870
Published online, 8th February, 2005
DOI: 10.3987/COM-04-10276
Microwave-assisted Aromatization of 1,3,5-Trisubstituted 2-Pyrazolines by Silica-supported N-Bromosuccinimide as a Useful Reagent under Solvent Free ‘Dry’ Condition

Davood Azarifar* and Behrooz Maleki

*Department of Chemistry, School of Science, Bu-Ali Sina University, Hamadan 65174, Iran

Abstract

An efficient aromatization of 1,3,5-trisubstituted 2-pyrazolines to their corresponding pyrazoles by NBS was carried out under microwave irradiation and solvent-free conditions in moderate yields. It has also been observed that, by activating the NBS reagent on silica gel as a support the reaction times can be dramatically reduced and good yields are obtained.