First Catalytic and Green Synthesis of Aryl-(<i>Z</i>)-vinyl Chlorides and Its Plausible Addition−Elimination Mechanism
作者:Weike Su、Can Jin
DOI:10.1021/ol062991c
日期:2007.3.1
mol %)/benzoyl chloride (5 mol %), aromatic ketones were treated with bis(trichloromethyl) carbonate (BTC) to afford aryl-(Z)-vinyl chlorides. All metal triflates tested in the reaction showed highly catalytic activity. A plausible addition-elimination mechanism was proposed. The present work describes the first catalytic and green route to the synthesis of aryl-(Z)-vinyl chlorides. [reaction: see
Vinyl chlorides and bromides are obtained in good yield from the corresponding ketones and acetylhalides in the presence of trifluoroacetic or trifluoromethanesulfonic acid. The Z isomer is selectively formed.
A remarkable steric effect in palladium-catalyzed Grignard coupling: regio- and stereoselective monoalkylation and -arylation of 1,1-dichloro-1-alkenes
作者:Akio Minato、Keizo Suzuki、Kohei Tamao
DOI:10.1021/ja00238a052
日期:1987.2
concern in transition-metalcomplex catalyzed carbon-carbon bond-forming reactions. As part of their continued studies on the palladium-phosphine complex catalyzed selective monoalkylation of organic polyhalides, they report here the first success in the regio- and stereoselective monoalkylation and -arylation of 1,1-dichloro-1-alkenes by Grignard or organozinc reagents in the presence of (PdCl/sub2/(dppb))
Metal-free transfer hydrochlorination of internal C–C triple bonds with a bicyclo[3.1.0]hexane-based surrogate releasing two molecules of hydrogen chloride
作者:Andreas J. Weidkamp、Martin Oestreich
DOI:10.1039/d1cc06591b
日期:——
The development and application of a transfer hydrochlorination reagent based on a trichlorinated bicyclo[3.1.0]hexane core that transfers two molecules of HCl per molecule of surrogate to a π-basic substrate under B(C6F5)3 catalysis is reported. Lewis acid-assisted chloride abstraction followed by thermal electrocyclic cyclopropyl-to-allyl cation ring opening releases ring strain as a previously unexploited
报道了基于三氯化双环[3.1.0]己烷核心的转移氢氯化试剂的开发和应用,该试剂在B(C 6 F 5 ) 3催化下将每个替代物分子中的两个HCl分子转移到π-碱性底物上。路易斯酸辅助氯化物提取,然后是热电环丙基到烯丙基阳离子开环释放环应变作为以前未开发的驱动力。
Bromochlorination of Alkenes with Dichlorobromate(1–) Ion. II. Regio- and Stereochemistry for the Bromochlorination of 1-Phenylpropenes with Dichlorobromate(1–) Ion
作者:Takeshi Negoro、Yoshitsugu Ikeda
DOI:10.1246/bcsj.57.2116
日期:1984.8
(dielectric constants 5–36) were found to be completely anti stereospecific and nonregiospecific, although Markownikoff adduct was mainly formed. In marked contrast, addition of molecular bromine chloride to the same alkenes was found to give nonstereospecific and regiospecific adducts. These results suggest that the addition of bromine chloride in the form of (n-C4H9)4NBrCl2 involves a rate- and product-determining