The Catalytic Mannich Reaction of 1,1-Difluoro-2-trialkyl(aryl)silyl-2-trimethyl-silyloxyethenes: Preparation of β-Amino Acid Derivatives
作者:Woo Jin Chung、Masaaki Omote、John T. Welch
DOI:10.1021/jo050953l
日期:2005.9.1
Catalytic Mannich reactions of 1,1-difluoro-2-trialkyl(aryl)silyl-2-trimethylsilyloxyethenes (3) with a variety of sulfonylimines were utilized for the preparation of α,α-difluoro-β-amino acidderivatives (7). The influence of the Lewis acid on the reaction was examined. Methods for the conversion of α,α-difluoroacylsilanes to α,α-difluorocarboxylic acids were also explored.
Lewis acid promoted aldol reaction of fluorinated silyl enol ethers from new fluoroacetylsilane derivatives
作者:Woo Jin Chung、Silvana C. Ngo、Seiichiro Higashiya、John T. Welch
DOI:10.1016/j.tetlet.2004.05.055
日期:2004.7
Newfluorinated silyl enol ethers with various trialkylsilyl groups were synthesized. Various fluorinated β-hydroxy ketones were synthesized by Lewisacid promoted aldol reaction of silyl enol ethers with diverse aldehydes. Reactivity of various trialkylsilyloxy groups toward Lewisacid was also studied.