利用空气中的氧气作为末端氧化剂,从醇和仲胺中Cu催化合成酰胺已得到发展。该方法操作简单,不需要高压设备或纯氧气的处理。可商购的非贵金属催化剂Cu(phen)Cl 2与二叔丁基肼二羧酸酯和无机碱一起以中等到极好的收率提供了多种苯甲酰胺。胺共轭酸的p K a和醇的电子学被证明会影响碱的选择,以实现最佳反应性。提出了一种与观察到的反应性趋势,KIE和Hammett研究相一致的机制。
Silver-Catalyzed Decarboxylative Trifluoromethylation of Aliphatic Carboxylic Acids
作者:Xinqiang Tan、Zhonglin Liu、Haigen Shen、Pei Zhang、Zhenzhen Zhang、Chaozhong Li
DOI:10.1021/jacs.7b07944
日期:2017.9.13
The silver-catalyzed decarboxylativetrifluoromethylation of aliphatic carboxylicacids is described. With AgNO3 as the catalyst and K2S2O8 as the oxidant, the reactions of aliphatic carboxylicacids with (bpy)Cu(CF3)3 (bpy = 2,2'-bipyridine) and ZnMe2 in aqueous acetonitrile at 40 °C afford the corresponding decarboxylativetrifluoromethylation products in good yield. The protocol is applicable to