期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 350, 期 11-12, 页码 1823-1829出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200800194
关键词
alkenes; esters; Julia-Kocienski olefination; sulfones; Weinreb amides
资金
- Ministerio de Educacion y Ciencia [CTQ2004-00808/BQU, CTQ2007-62771/BQU]
- Consolider INGENIO 2010 [CSD2007-00006]
- Generalitat Valenciana [GRUPOS05/11, GV05/144, GV/2007/142]
- University of Alicante
alpha-Fluoroacetates 3 and Weinreb amide 4, bearing a alpha-[3,5-bis(trifluoromethyl)phenyl]sulfonyl (BTFP-sulfonyl) group at the alpha-position, are employed in the highly stereoselective synthesis of alpha-fluoro-alpha,beta-unsaturated alkenoates and Weinreb amides, respectively. Aromatic and aliphatic aldehydes are condensed under extremely mild and simple reaction conditions using potassium carbonate in dimethylformamide. at room temperature under solid-liquid phase-transfer catalysis conditions in good yields and high Z-diastereoselectivities, specially in the case of the fluorinated Weinreb amides. A detailed computational mechanistic study suggests a final non-concerted elimination of sulfur dioxide and 3,5-bis(trifluoromethyl)phenoxide and explains the observed high stereoselectivities for the reaction on the basis of thermodynamic and kinetic considerations.
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