Overcoming Scope Limitations in Cross-Coupling of Diazo Nucleophiles by Manipulating Catalyst Speciation and Using Flow Diazo Generation
作者:Ryan J. Sullivan、Garrett P. R. Freure、Stephen G. Newman
DOI:10.1021/acscatal.9b01180
日期:2019.6.7
palladium-catalyzed diazo cross-coupling reactions has been expanded to include aryl chlorides by controlled diazo slow addition. The success of this strategy is based on manipulating speciation within the catalytic cycle through starvation of the diazo reagent to make the Pd(II) oxidative intermediate the resting state. The strategy is also applicable to cross-coupling reactions with aryl bromides and, in combination
通过控制重氮缓慢添加,钯催化的重氮交叉偶联反应的可应用范围已扩大到包括芳基氯化物。该策略的成功是基于通过重氮试剂的饥饿来控制催化周期内的物种形成,以使Pd(II)氧化中间体处于静止状态。该策略也适用于与芳基溴化物的交叉偶联反应,并且与安全,按需生成不稳定的重氮试剂相结合,也已被用于大大扩展该化学方法中适用的重氮化合物的范围。最后,DFT计算提供了对机制的深入了解,并为慢速添加策略成功的建议解释提供了支持。