Journal
ULTRASONICS SONOCHEMISTRY
Volume 27, Issue -, Pages 423-429Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2015.06.005
Keywords
Ultrasound; Multicomponent reaction (MCR); One-pot synthesis; Pyrazole derivatives; Water as solvent
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Funding
- National Research Foundation, Pretoria, South Africa
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A simple, catalyst-free, green synthetic protocol is described for the one-pot synthesis of pyrazoles via multicomponent reaction of aromatic aldehydes, hydrazine monohydrate and ethyl acetoacetate and malononitrile/ammonium acetate in water under ultrasound irradiation. This protocol avoids traditional chromatography and purification steps and it affords highly selective conversion with no by products. (C) 2015 Elsevier B.V. All rights reserved.
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