Diastereoselective Pd(II)-Catalyzed sp<sup>3</sup>C–H Arylation Followed by Ring Opening of Cyclopropanecarboxamides: Construction of<i>anti</i>β-Acyloxy Carboxamide Derivatives
作者:Bojan Gopalakrishnan、Sruthi Mohan、Ramarao Parella、Srinivasarao Arulananda Babu
DOI:10.1021/acs.joc.6b01635
日期:2016.10.7
diastereoselective Pd(OAc)2-catalyzed, bidentate ligand-directed sp3 C–H activation/arylation followed by ring opening of cyclopropanecarboxamides, which were assembled from cyclopropanecarbonyl chlorides and bidentate ligands (e.g., 8-aminoquinoline and 2-(methylthio)aniline), has been investigated. The treatment of various cyclopropanecarboxamides with excess amounts of aryl iodides in the presence of the Pd(OAc)2
非对映选择性的Pd(OAc)2催化的,双齿配体导向的sp 3 C–H活化/芳基化反应,然后环丙烷甲酰胺的开环,环丙烷甲酰胺由环丙烷羰基氯化物和双齿配体(例如8-氨基喹啉和2-(甲硫基)组装而成)苯胺),已被调查。在Pd(OAc)2催化剂,AgOAc和AcOH存在下,用过量的芳基碘化物处理各种环丙烷甲酰胺可直接提供相应的多个β-CHH芳基化开链羧酰胺(抗β-酰氧基酰胺)。这种方法导致了几种反构造具有邻位立体中心且高度立体控制的β-酰氧基酰胺,形成一个新的C-O键和三个新的C-C键。基于一些控制实验,提出了由Pd催化,双齿配体定向的β-C-H芳基化和环丙烷甲酰胺的开环形成多种β-CHH芳基化开链羧酰胺的合理机制。基于代表性的β-酰氧基酰胺的X射线结构分析,确定了观察到的β-酰氧基酰胺的非对映选择性和抗立体化学。