Nickel-Catalyzed CH Alkylations: Direct Secondary Alkylations and Trifluoroethylations of Arenes
作者:Weifeng Song、Sebastian Lackner、Lutz Ackermann
DOI:10.1002/anie.201309584
日期:2014.2.24
A versatile nickel catalyst allowed for CHalkylations of unactivated arenes with challenging secondary alkyl bromides and chlorides. The high catalytic efficacy also set the stage for direct secondary alkylations of indoles as well as CH trifluoroethylations with ample substrate scope.
Pd-Catalyzed Monoselective<i>ortho</i>-C–H Alkylation of<i>N</i>-Quinolyl Benzamides: Evidence for Stereoretentive Coupling of Secondary Alkyl Iodides
作者:Shu-Yu Zhang、Qiong Li、Gang He、William A. Nack、Gong Chen
DOI:10.1021/ja511557h
日期:2015.1.14
phosphate notably improves the alkylation yield, although it may not be directly involved in C-H palladation or the subsequent functionalization step. Kinetic isotope effect studies indicate that C-H palladation is not the rate-limiting step. Examination of the reactions of an isolated palladacycle intermediate with both cis- and trans-4-methylcyclohexyl iodides revealed surprising stereoretentive couplings