Combined Experimental and Computational Mechanistic Investigation of the Palladium-Catalyzed Decarboxylative Cross-Coupling of Sodium Benzoates with Chloroarenes
作者:Jenna N. Humke、Ryan A. Daley、Aaron S. Morrenzin、Sharon R. Neufeldt、Joseph J. Topczewski
DOI:10.1021/acs.joc.1c00910
日期:2021.9.3
is a mechanistic investigation into the palladium-catalyzed decarboxylative cross-coupling of sodium benzoates and chloroarenes. The reaction was found to be first-order in Pd. A minimal substituent effect was observed with respect to chloroarene, and the reaction was zero-order with respect to chloroarene. Palladium-mediated decarboxylation was assigned as the turnover-limiting step based on an Eyring
本文报道了对钯催化的苯甲酸钠和氯芳烃的脱羧交叉偶联的机理研究。发现反应在 Pd 中是一级反应。观察到对氯芳烃的取代作用最小,对氯芳烃反应为零级。基于艾林图和密度泛函理论计算,钯介导的脱羧被指定为转换限制步骤。发现催化剂性能因亲电试剂而异,这最好通过催化剂在 Pd(0) 处分解来解释。的1,5-环辛二烯(COD)的配体包含在前段催化剂CODPd(CH 2 TMS)2(PD1)被证明是有益的添加剂。长凳稳定的 Buchwald 复合体XPhosPdG2可以与外源COD和2-二环己基膦基-2',4',6'-三异丙基联苯(XPhos)代替复杂的使用PD1。添加外源 XPhos 显着增加了催化剂周转数并增强了重现性。