Pd(II)-Catalyzed Direct <i>ortho</i>-C–H Acylation of Aromatic Ketones by Oxidative Decarboxylation of α-Oxocarboxylic Acids
作者:Pui-Yiu Lee、Peiwen Liang、Wing-Yiu Yu
DOI:10.1021/acs.orglett.7b00677
日期:2017.4.21
A Pd-catalyzed decarboxylative acylation of aromatic ketones with α-oxocarboxylic acids was developed, and 1,2-diacylbenzenes were formed in up to 90% yield with excellent ortho-selectivity. This work demonstrates the first successful attempt to direct C–H acylation of aromatic ketones without the need for prederivatization to imines. The acylation reaction was inhibited by radical scavengers such
开发了α-氧代羧酸钯催化芳族酮的脱羧酰化反应,并以高达90%的产率形成了1,2-二酰基苯,并具有优异的邻位选择性。这项工作证明了直接进行芳族酮的C–H酰化反应而无需对亚胺进行去衍生化的首次成功尝试。酰化反应被自由基清除剂如TEMPO抑制,并且已分离并表征了2,2,6,6-四甲基哌啶-1-基苯甲酸酯,TEMPO和苯甲酰基的加合物。该发现与酰基自由基的中间性相容。提出了涉及芳基酮的四环配合物与酰基反应的机理。