AbstractA selective and operationally simple iron‐catalyzed cross‐coupling of aryl chlorides with alkylmagnesium halides has been developed. The reaction tolerates various functional groups and exhibits high chemoselectivity even in the presence of aryl bromides. Mechanistic studies indicate the essential role of the olefin substituent for substrate activation. Competing polymerization and reduction are effectively suppressed.magnified image
PPh3 and zinc metal conjugated alkenes (CH2CHCOOR, CH2CHCN, CH2CHSO2Ph and CH2CHCONEt2) undergo reductive tail-to-tail dimerization to yield the corresponding saturated linear products. Under similar reaction conditions, vinylarenes (ArCHCH2) give stereoselective head-to-tail dimerization products, trans-1,3-diarylbut-1-ene, in good to excellent yields.
Investigation of the behavior of arenediazonium salts with olefins in BmimPF6
作者:George W. Kabalka、Gang Dong、Bollu Venkataiah
DOI:10.1016/j.tetlet.2004.02.023
日期:2004.3
The palladium-catalyzedreactions of olefins with arenediazonium salts in ionic liquids were investigated. For methylacrylate and methyl acrylonitrile, normal Heck cross-coupling products are obtained in good yields. However, highly selective dimerization products are formed in excellent yields for styrenes. The catalyst system can be recycled.
Olefin-Assisted Iron-Catalyzed Alkylation of Aryl Chlorides
作者:Samet Gülak、Tim N. Gieshoff、Axel Jacobi von Wangelin
DOI:10.1002/adsc.201300095
日期:2013.8.12
AbstractA selective and operationally simple iron‐catalyzed cross‐coupling of aryl chlorides with alkylmagnesium halides has been developed. The reaction tolerates various functional groups and exhibits high chemoselectivity even in the presence of aryl bromides. Mechanistic studies indicate the essential role of the olefin substituent for substrate activation. Competing polymerization and reduction are effectively suppressed.magnified image
Iodine-Promoted Metal-Free Head-to-Tail Dimerization of Styrenes Affording 1,3-Diarylbut-1-enes
作者:Sen Lin、Shengmei Guo、Dingyi Wang、Yanjiao Fang、Qihuang Xie、Zhaohua Yan
DOI:10.1055/s-0036-1589214
日期:——
A convenient and efficient iodine-mediated head-to-tail dimerization of styrenes to produce the corresponding dimers in the presence of triethyl phosphite is reported. The advantages of the present protocol are metal-free conditions, short reaction time, simplicity, and high efficiency.