Journal
TETRAHEDRON LETTERS
Volume 48, Issue 38, Pages 6763-6766Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.07.103
Keywords
solvent-free; 1,4-addition of thiols; microwave irradiation; citronellal; citral
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A general, clean and easy method for the conjugated addition of thiols to citral promoted by KF/Al2O3 under solvent-free conditions at room temperature or under MW irradiation is described. It was found that the same protocol is applicable to the direct reaction of thiophenol with essential oil of lemon grass (Cymbopogon citratus) to afford directly 3-thiophenylcitronellal, a potential bactericide agent. The method was extended to others electron-poor alkenes with excellent results. The catalytic system can be reused up to three times without previous treatment with comparable activity. (c) 2007 Elsevier Ltd. All rights reserved.
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