Desulfurative Chlorination of Alkyl Phenyl Sulfides
作者:Daniele Canestrari、Stefano Lancianesi、Eider Badiola、Chiara Strinna、Hasim Ibrahim、Mauro F. A. Adamo
DOI:10.1021/acs.orglett.7b00077
日期:2017.2.17
The chlorination of readily available secondary and tertiary alkyl phenyl sulfides using (dichloroiodo)benzene (PhICl2) is reported. This mild and rapid nucleophilic chlorination is extended to sulfa-Michael derived sulfides, affording elimination-sensitive β-chloro carbonyl and nitro compounds in good yields. The chlorination of enantioenriched benzylic sulfides to the corresponding inverted chlorides
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。
Preparation and Reactions of Titanium(III) Chloride Solubilized in Inert Organic Solvents
Titanium(IV) chloride reacts with dialkyl telluride in inert solvents such as dichloromethane or benzene to form a stable homogeneous solution of titanium(III) species. Reduction of several organic functionalities has been carried out using the low valent titanium solution thus obtained.
Indium-Catalyzed Direct Chlorination of Alcohols Using Chlorodimethylsilane−Benzil as a Selective and Mild System
作者:Makoto Yasuda、Satoshi Yamasaki、Yoshiyuki Onishi、Akio Baba
DOI:10.1021/ja048688t
日期:2004.6.1
The InCl3-catalyzed reaction of alcohols with chlorodimethylsilane (HSiMe2Cl) in the presence of benzil gave the corresponding organic chlorides under mild conditions. Benzil significantly changes the reaction course because the reducing product through dehydroxyhydration was obtained in the absence of benzil. The secondary or tertiary alcohols were effectively chlorinated. The substrates bearing acid-sensitive functional groups were also applied to this system. The highly selective chlorination of the tertiary site was observed in the competitive reaction between tertiary and primary alcohols. The highly coordinated hydrosilane generated from benzil and HSiMe2Cl is an important intermediate.
Direct Reduction of Alcohols: Highly Chemoselective Reducing System for Secondary or Tertiary Alcohols Using Chlorodiphenylsilane with a Catalytic Amount of Indium Trichloride
作者:Makoto Yasuda、Yoshiyuki Onishi、Masako Ueba、Takashi Miyai、Akio Baba
DOI:10.1021/jo0158534
日期:2001.11.1
The direct reduction of alcohols using chlorodiphenylsilane as a hydride source in the presence of a catalytic amount of indium trichloride is described. Benzylic alcohols, secondary alcohols, and tertiary alcohols were effectively reduced to give the corresponding alkanes in high yields. A compound bearing both primary and secondary hydroxyl groups was reduced only at the secondary site to afford the primary alcohol after workup with Bu4NF. This system showed high chemoselectivity only for the hydroxyl group while not reducing other functional groups that are readily reduced by standard reducing systems. Thus alcohols bearing ester, chloro, bromo, or nitro groups, which are sensitive to LiAlH4 or Zn/H+, were selectively reduced only at the hydroxyl sites by the chlorodiphenylsilane/InCl3 system. NMR studies revealed the reaction course. The hydrodiphenylsilyl ether is initially formed and then, with InCl3 acting as a Lewis acid, forms an oxonium. complex, which accelerates the desiloxylation with donation of the hydrogen to the carbon.