Sodium Phenoxide−Phosphine Oxides as Extremely Active Lewis Base Catalysts for the Mukaiyama Aldol Reaction with Ketones
作者:Manabu Hatano、Eri Takagi、Kazuaki Ishihara
DOI:10.1021/ol702052r
日期:2007.10.1
A highly efficient Mukaiyama aldolreaction between ketones and trimethylsilyl enolates catalyzed by sodium phenoxide-phosphine oxides as simple homogeneous Lewis base catalysts (0.5-10 mol %) was developed, which minimized competing retro-aldolreaction. For a variety of aromatic ketones and aldimines, aldol and Mannich-type products with an alpha-quaternary carbon center were obtained in good to
Indium-catalyzed coupling reaction between silyl enolates and alkyl chlorides or alkyl ethers
作者:Yoshihiro Nishimoto、Takahiro Saito、Makoto Yasuda、Akio Baba
DOI:10.1016/j.tet.2009.03.106
日期:2009.7
The coupling reactions of alkyl chlorides with silyl enolates catalyzed by InBr3, and the coupling reactions of alkylethers with silyl enolates catalyzed by the combined Lewis acid of InBr3/Me3SiBr are described. In both reaction systems, various types of silyl enolates were used to give corresponding α-alkylated esters, ketones, carboxylic acids, amides, thioesters, and aldehydes.
描述了烷基氯化物与InBr 3催化的烯醇硅酸酯的偶联反应,以及烷基醚与InBr 3 / Me 3 SiBr的路易斯酸催化的烯醇硅酸酯的偶联反应。在两个反应系统中,都使用了各种类型的甲硅烷基烯酸酯,以生成相应的α-烷基化的酯,酮,羧酸,酰胺,硫代酯和醛。
Borane-Catalyzed C–F Bond Functionalization of <i>gem</i>-Difluorocyclopropenes Enables the Synthesis of Orphaned Cyclopropanes
作者:Joseph P. Mancinelli、Wang-Yeuk Kong、Wentao Guo、Dean J. Tantillo、Sidney M. Wilkerson-Hill
DOI:10.1021/jacs.3c05278
日期:2023.8.9
steric and electronic properties and enables access to 3,3-bis(difluoromethyl)cyclopropenes in short order. The resulting cyclopropene products are readily reduced to the corresponding orphaned cyclopropanes under hydrogenation conditions. Quantum chemical calculations reveal the nature of the C–F bond cleavage steps and provide evidence for catalysis by boron and not silylated oxonium ions, though
Coupling Reaction of Alkyl Chlorides with Silyl Enolates Catalyzed by Indium Trihalide
作者:Yoshihiro Nishimoto、Makoto Yasuda、Akio Baba
DOI:10.1021/ol701684n
日期:2007.11.1
Indium(III) halide catalyzed not only the coupling of alkyl chlorides with silyl enolates derived from esters, ketones, and aldehydes to give a variety of alpha-alkylated carbonylcompounds but also one-pot, three-component reactions of aldehyde enolate, alkyl chloride, and allylsilane or alkynylsilane.