Iron-Catalyzed Enantioselective Radical Carboazidation and Diazidation of α,β-Unsaturated Carbonyl Compounds
作者:Wen Liu、Maoping Pu、Jun He、Tinghui Zhang、Shunxi Dong、Xiaohua Liu、Yun-Dong Wu、Xiaoming Feng
DOI:10.1021/jacs.1c05881
日期:2021.8.4
Azidation of alkenes is an efficient protocol to synthesize organic azides which are important structural motifs in organic synthesis. Enantioselective radical azidation, as a useful strategy to install a C–N3 bond, remains challenging due to the inherently instability and unique structure of radicals. Here, we disclose an efficient enantioselective radical carboazidation and diazidation of α,β-unsaturated
烯烃的叠氮化是合成有机叠氮化物的有效方法,有机叠氮化物是有机合成中的重要结构基序。由于自由基固有的不稳定性和独特的结构,对映选择性自由基叠氮化作为安装 C-N 3键的有用策略仍然具有挑战性。在这里,我们公开了由手性N , N '-二氧化物 / Fe(OTf) 2催化的α,β-不饱和酮和酰胺的有效对映选择性自由基碳叠氮化和重氮化复合体。一系列取代的烯烃被转化为相应的α-叠氮羰基衍生物,具有良好到优异的对映选择性,有利于手性α-氨基酮、邻氨基醇和邻二胺的制备。对照实验和机理研究证明了反应过程中的自由基途径。DFT 计算表明叠氮基通过分子内五元过渡态与 Fe-N 3物种的内部氮转移到自由基中间体。