Journal
TETRAHEDRON LETTERS
Volume 52, Issue 18, Pages 2312-2315Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2011.02.063
Keywords
Redox reaction; Umpolung; Acyl cyanide; Triethylamine
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Funding
- Ministry of Education, Science and Technology [2009-0069496]
- Korean Government (MOEHRD) [KRF-2008-331-1-C00158]
- National Research Foundation of Korea [2009-0069496] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Stereoselective redox cyanation of alkynyl aldehydes was explored, furnishing (E)-alpha,beta-unsaturated acyl cyanides. This reaction was catalyzed by mild TEA base, as a dual role of Lewis base and Bronsted base. TMSCN treated with TEA was an effective reagent for generating umpolung intermediates from alkynyl aldehydes, and this nucleophilic intermediate can be protonated by equimolar amount of EtOH, promoting the efficient conversion into alpha,beta-unsaturated acyl cyanides. The synthesized acyl cyanides were successfully applied as the synthetic precursors in the iron-catalyzed arylation reactions. (C) 2011 Elsevier Ltd. All rights reserved.
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