The Stabilized Cation Pool Method: Metal- and Oxidant-Free Benzylic C–H/Aromatic C–H Cross-Coupling
摘要:
Electrochemical oxidation of toluene derivatives in the presence of a sulfilimine gave benzylaminosulfonium ions as stabilized benzyl cation pools, which reacted with subsequently added aromatic nucleophiles to give the corresponding cross-coupling products. The transformation serves as a powerful metal- and chemical-oxidant-free method for benzylic C-H/aromatic C-H cross-coupling. The method has been successfully applied to synthesis of TP27, an inhibitor of PTPase.
Trialkylsilyl triflimides as easily tunable organocatalysts for allylation and benzylation of silyl carbon nucleophiles with non-genotoxic reagents
作者:Oscar Mendoza、Guy Rossey、Léon Ghosez
DOI:10.1016/j.tetlet.2010.03.030
日期:2010.5
Trialkylsilyl triflimides generated in situ are unique catalysts for the electrophilic benzylation or allylation of trialkylsilylenol ethers or allyl trialkylsilanes with non-genotoxic alkylating reagents such as benzyl and allyl acetates. In most cases the reactions are fast at room temperature and yields are high. The reaction works particularly well with electron-rich benzyl donors including derivatives
The present invention relates to cycloalkenyl aryl derivatives, isomers thereof, pharmaceutically acceptable salts thereof, hydrates thereof, or solvates thereof; a method for preparing the derivatives; and pharmaceutical compositions containing the same. The compounds of the present invention show the effect of CETP activity inhibition. It means that the compounds can increase HDL-cholesterol and decrease LDL-cholesterol.
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。
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.
In the presence of silver triflate, benzylic chloroformates react with silylenolethers to afford benzylated ketones by the decarboxylative coupling in good yields, whereas in the presence of various Lewis acids, yields of the product were poor under the same reaction conditions.