Intermolecular Oxidative C–N Bond Formation under Metal-Free Conditions: Control of Chemoselectivity between Aryl sp2 and Benzylic sp3 C–H Bond Imidation
摘要:
A new synthetic approach toward intermolecular oxidative C-N bond formation of arenes has been developed under transition-metal-free conditions. Complete control of chemoselectivity between aryl sp(2) and benzylic sp(3) C-H bond imidation was achieved by the choice of nitrogen sources, representatively being phthalimide and dibenzenesulfonimide, respectively.
Highly Regioselective Copper-Catalyzed Benzylic CH Amination by N-Fluorobenzenesulfonimide
作者:Zhikun Ni、Qian Zhang、Tao Xiong、Yiying Zheng、Yan Li、Hongwei Zhang、Jingping Zhang、Qun Liu
DOI:10.1002/anie.201107427
日期:2012.1.27
Primary target: A practical and effective copper‐catalyzed amination strategy for synthesizing various benzylic amines from benzylic hydrocarbons is described (see scheme; DCE=1,2‐dichloroethane). Xylene substrates can undergo diamination reactions using this method. The remarkable preference for primary over secondary benzylic CHbonds has been observed for the first time.
Ligand-free iron-catalyzed benzylic C (sp<sup>3</sup>)–H amination of methylarenes with <i>N</i>-fluorobenzenesulfonimide
作者:Fengyu Bao、Yuanbo Cao、Wenbo Liu、Junhao Zhu
DOI:10.1039/c9ra05294a
日期:——
Direct conversion of cheap methylarenes to benzylic amines, which are essential structural units of important drugs, is of great significance. However, the known methodologies suffer from the requirement of noble metal catalysts, heavy metal residues or strong oxidants. Herein, the first biocompatible iron-catalyzed benzylic C (sp3)–H amination of methylarenes with N-fluorobenzenesulfonimide is described
molecules. Because arylacetic acids are regarded as key structures in bioactive compounds, new transformations of these structures could contribute to drug/agrochemical discovery and chemical biology. This work reports carbon–nitrogen and carbon–oxygen bond formation through the photoredox‐catalyzed decarboxylation of arylacetic acids. The reaction shows good functional group compatibility without pre‐activation