Pd(II)-Catalyzed C–H Functionalizations Directed by Distal Weakly Coordinating Functional Groups
作者:Gang Li、Li Wan、Guofu Zhang、Dasheng Leow、Jillian Spangler、Jin-Quan Yu
DOI:10.1021/ja5126897
日期:2015.4.8
functionalizations of more distal C-H bonds in hydrocinnamoyl ketones, Weinreb amides, and biphenyl Weinreb amides. Mechanistically, the coordination of these carbonyl groups and the bisdentate amino acid ligand with Pd(II) centers provides further evidence for our early hypothesis that the carbonyl groups of the potassium carboxylate are responsible for the directed C-H activation of carboxylic acids.
开发了广泛使用的合成结构单元苯乙酰基 Weinreb 酰胺、酯和酮的邻-C(sp(2))-H 烯化和乙酰氧基化,无需安装额外的导向基团。远端弱配位和配体加速之间的相互作用对于这些反应在温和条件下进行至关重要。目标CH键和定向官能团之间的较长距离的耐受性还允许在氢化肉桂酰酮、Weinreb酰胺和联苯Weinreb酰胺中对更远端的CH键进行官能化。从机制上讲,这些羰基和双齿氨基酸配体与 Pd(II) 中心的配位为我们早期的假设提供了进一步的证据,即羧酸钾的羰基负责羧酸的定向 CH 活化。