Mild Palladium-Catalyzed C–H Alkylation Using Potassium Alkyltrifluoroborates in Combination with MnF3
摘要:
A Pd-catalyzed method for ligand-directed C-H alkylation with organoboron reagents is described. The combination of potassium organo-trifluoroborates, MnF3, and a Pd-II catalyst effects pyridine and amide-directed C-H alkylation. These reactions proceed under mild conditions (25-40 degrees C in weakly acidic media), are effective for installing methyl and 1 degrees alkyl groups, and do not require promoters such as benzoquinone.
Branch-Selective and Enantioselective Iridium-Catalyzed Alkene Hydroarylation via Anilide-Directed C–H Oxidative Addition
作者:Simon Grélaud、Phillippa Cooper、Lyman J. Feron、John F. Bower
DOI:10.1021/jacs.8b04627
日期:2018.8.1
Tertiary benzylic stereocenters are accessed in high enantioselectivity by Ir-catalyzed branch selective addition of anilide ortho-C-H bonds across styrenes and α-olefins. Mechanistic studies indicate that the stereocenter generating step is reversible.
通过 Ir 催化的苯胺邻位-CH 键在苯乙烯和 α-烯烃上的分支选择性加成,可以高对映选择性地获得叔苄基立构中心。机理研究表明,立体中心生成步骤是可逆的。