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DOI: 10.1055/s-0031-1289571
An Efficient Procedure for the Synthesis of α,β-Unsaturated Ketones and Its Application to Heterocyclic Systems
Publication History
Publication Date:
20 October 2011 (online)
Abstract
An efficient and room-temperature procedure is developed for high yield synthesis of novel α,β-unsaturated derivatives of thiopyran 3 directly from ketone 1 and various aldehydes in the presence of catalytic quantities of TMSNMe2 and MgBr2˙OEt2 under solvent-free conditions. The main advantage of the procedure is that the formation of the undesired bis by-products is minimized. In addition, the procedure is applicable to other enolizable carbocyclic and acyclic ketones.
Key words
α,β-unsaturated ketones - thiopyran-4-one - magnesium bromide etherate - aldol condensation
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- Supporting Information
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References
Crystallographic data for 3i have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no. CCDC-846075. Copies of these data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK [Fax: +44(1223)336033; E-mail: deposit@ccdc.cam.ac.uk or via www.ccdc.cam.ac.uk/conts/retrieving.html].