Direct Alkylation of Glycine Derivatives via Photoinduced Palladium Catalysis, Utilizing Intermolecular Hydrogen Atom Transfer Mediated by Alkyl Radicals
作者:Sen Yang、Hao Hu、Jun-hua Li、Ming Chen
DOI:10.1021/acscatal.3c04075
日期:2023.12.15
while showcasing remarkable tolerance toward diverse functional groups. To shed light on the underlying mechanism, extensive investigations involving control experiments, deuterium labeling, radical clocking, and kinetic studies have been conducted. The collected data consistently support a reaction pathway involving the formation of Pd(I)/alkyl hybrid species followed by intermolecular HAT and elimination
烷基/Pd杂化物种是一种独特的以sp3-C为中心的自由基,可在甘氨酸衍生物直接烷基化的开发中促进分子间氢原子转移(HAT)。这种转化反应在简单温和的条件下顺利进行,在涵盖甘氨酸衍生物和烷基溴的底物范围方面表现出令人印象深刻的多功能性,同时表现出对不同官能团的显着耐受性。为了阐明潜在的机制,已经进行了涉及控制实验、氘标记、自由基时钟和动力学研究的广泛研究。收集到的数据一致支持反应途径,包括形成 Pd(I)/烷基杂化物,然后进行分子间 HAT 和消除步骤,从而导致亚胺中间体的原位形成,最终通过自由基加成在最后阶段达到顶峰。