Reductive coupling of benzyl oxalates with highly functionalized alkyl bromides by nickel catalysis
作者:Xiao-Biao Yan、Chun-Ling Li、Wen-Jie Jin、Peng Guo、Xing-Zhong Shu
DOI:10.1039/c8sc00609a
日期:——
Coupling reactions involving non-sulfonated C–O electrophiles provide a promising method for forming C–C bonds, but the incorporation of functionalized or secondary alkyl groups remains a challenge due to the requirement for well-defined alkylmetal species. In this study, we report a reductive nickel-catalyzed cross-coupling of benzyl oxalates with alkyl bromides, using oxalate as a new leaving group
Remote carboxylation of halogenated aliphatic hydrocarbons with carbon dioxide
作者:Francisco Juliá-Hernández、Toni Moragas、Josep Cornella、Ruben Martin
DOI:10.1038/nature22316
日期:2017.5
along the hydrocarbon side-chain with excellent regio- and chemoselectivity, representing a remarkable reactivity relay when compared with classical cross-coupling reactions. Our results demonstrate that site-selectivity can be switched and controlled, enabling the functionalization of less-reactive positions in the presence of a priori more reactive ones. Furthermore, we show that raw materials obtained
Photoinduced Radical Borylation of Alkyl Bromides Catalyzed by 4‐Phenylpyridine
作者:Li Zhang、Zhong‐Qian Wu、Lei Jiao
DOI:10.1002/anie.201912564
日期:2020.1.27
Utilizing pyridine catalysis, we developed a visible-light-induced transition-metal-free radical borylation reaction of unactivated alkyl bromides that features a broad substrate scope and mild reaction conditions. Mechanistic studies revealed a novel nucleophilic substitution/photoinduced radical formation pathway, which could be utilized to trigger a variety of radical processes.
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。