E-resources
Peer reviewed
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de Aquino, Thalita F.B.; Seidel, Jessica P.; de Oliveira, Daniela H.; do Nascimento, José Edmilson R.; Alves, Diego; Perin, Gelson; Lenardão, Eder J.; Schumacher, Ricardo F.; Jacob, Raquel G.
Tetrahedron letters, 11/2018, Volume: 59, Issue: 46Journal Article
Display omitted •A direct and selective multicomponent strategy is described.•The reaction is catalysed by CuBr as a cheap, nontoxic and easy to handle salt.•The 1,3,5-triaryl-4-(organylselanyl)-1H-pyrazoles were obtained in good yields. We describe herein our results for the multicomponent synthesis of 1,3,5-triaryl-4-(organylselanyl)pyrazoles by copper-catalyzed cyclocondensation and a direct CH bond selenation reaction of arylhydrazines, chalcones and diorganyl diselenides using catalytic amount of CuBr in acetic acid as solvent at reflux temperature. This methodology proved to be simple and efficient to furnish a range of 4-(organylselanyl)-1H-pyrazoles in moderate to good yields.
