Divergent Construction of Heterocycles by SOMOphilic Isocyanide Insertion under N-Heterocyclic Carbene Catalysis
作者:Qianrong Li、Cong-Ying Zhou、Chengming Wang
DOI:10.1021/acs.orglett.2c03148
日期:2022.10.21
substitution-type radical cyclization in the absence of any light, transition metals, and external oxidants. The aldehyde-free, scalable, and operationally simple protocol tolerates diverse functionalized biaryl isonitriles and activated α-halides. Moreover, it can be further applied to the divergent construction of other N-heterocycles. Preliminary mechanistic studies disclose that an NHC-derived radical cation
在没有任何光、过渡金属和外部氧化剂的情况下,由 N-杂环卡宾 (NHC) 催化的亲 SOMophilic 异氰化物插入引发的均裂芳族取代型自由基环化快速构建了各种菲啶。无醛、可扩展且操作简单的协议可耐受各种功能化的联芳基异腈和活化的 α-卤化物。此外,它还可以进一步应用于其他 N-杂环的不同构造。初步机理研究表明,可能涉及 NHC 衍生的自由基阳离子中间体。