Nucleophilic Attack of α-Aminoalkyl Radicals on CarbonNitrogen Triple Bonds to Construct α-Amino Nitriles: An Experimental and Computational Study
作者:Chao Zhang、Chunmei Liu、Ying Shao、Xiaoguang Bao、Xiaobing Wan
DOI:10.1002/chem.201303296
日期:2013.12.23
A new reactivity pattern of α‐aminoalkyl radicals, involving nucleophilic attack on CN triple bonds under thermal conditions, has been developed to construct α‐amino nitriles. In contrast to previous CH functionalization of tertiary amines involving α‐aminoalkyl radicals, this methodology does not require the use of photocatalytic conditions or a transition‐metal catalyst. Inexpensive and nontoxic
已经开发出一种新的α-氨基烷基自由基反应性模式,涉及在热条件下对C onN三键的亲核攻击,以构建α-氨基腈。相较于以前的C H涉及α-氨基烷基自由基的叔胺的H官能化,该方法不需要使用光催化条件或过渡金属催化剂。选择廉价且无毒的苯乙腈作为该α-氨基腈形成反应的氰基来源。根据实验和计算结果,提出了一种合理的机制。在这种绿色温和的自由基过程中,α-氨基烷基自由基中间体和苯甲酰氰被证明是关键中间体。α-氨基烷基自由基对PhCOCN的CN键的亲核攻击,然后进行消除步骤,形成了所需的α-氨基腈和酰基基团。