Lewis Acid Mediated Selective Chalcogenalkylation of Silyl Enol Ethers with [O,S]-Acetals
作者:Antonio L. Braga、Luciano Dornelles、Claudio C. Silveira、Ludger A. Wessjohann
DOI:10.1055/s-1999-3429
日期:1999.4
Silyl enol ethers of ketones were selectively alkylated with [O,S]-acetals mediated by Lewis acid in a Mukaiyama type Aldol reaction. The products were β-alkoxy- and /or β-sulfanyl carbonyl compounds depending on the catalyst employed.
The reactions of enamines with sulfoxides bearing α-hydrogens in the presence of a magnesium amide, generated in situ from the reaction of ethylmagnesium bromide with diisopropylamine, afforded the corresponding α-sulfenylalkylated ketones and aldehydes in isolated yields ranging from 39 to 76%. This procedure was successfully extended to the bis(methylthio)methylation with methyl (methylthio)methyl
Ketene bis(phenylthio)acetals. Easily prepared intermediates for the conversion of acids and esters to .alpha.-alkylidene ketones and sulfur-substituted dienes
作者:Theodore Cohen、Richard E. Gapinski、Robert R. Hutchins
DOI:10.1021/jo01334a040
日期:1979.9
PATERSON I.; FLEMING I., TETRAHEDRON LETT., 1979, NO 23, 2179-2182
作者:PATERSON I.、 FLEMING I.
DOI:——
日期:——
COHEN T.; GAPINSKI R. E.; HUTCHINS R. R., J. ORG. CHEM., 1979, 44, NO 20, 3599-3601