ZnO: An Ecofriendly, Green Nano-catalyst for the Synthesis of Pyrazole Derivatives under Aqueous Media
作者:Yarabally R. Girish、Kothanahally S. Sharath Kumar、Heggadihalli S. Manasa、Sheena Shashikanth
DOI:10.1002/jccs.201400170
日期:2014.11
An efficient nano ZnO catalyzed green protocol for the synthesis of pyrazol derivatives by condensation of different substituted phenyl hydrazines/semicarbazide/thiosemicarbazide with 1,3‐diketone/ketoester at ambient temperature has been achieved. ZnO nanocatalyst was prepared by low temperature solution combustion method. From the Scherrer method the crystallite size of ZnO was estimated and found
Novel application of the palladium-catalyzed N-arylation of hydrazones to a versatile new synthesis of pyrazoles
作者:Nizar Haddad、James Baron
DOI:10.1016/s0040-4039(02)00245-9
日期:2002.3
A versatile synthesis of pyrazoles from aryl benzophenone hydrazones was demonstrated with a variety of 1,3-bifunctional substrates under acidic conditions. The obtained regioselectivity is consistent with transhydrazonation followed by subsequent cyclization. (C) 2002 Elsevier Science Ltd. All rights reserved.