Cobalt-Catalyzed Stereoselective Synthesis of 2,5-<i>trans</i>-THF Nitrile Derivatives as a Platform for Diversification: Development and Mechanistic Studies
作者:Sajjad Ali、Henrique Milanezi、Tânia M. F. Alves、Cláudio Francisco Tormena、Marco A. B. Ferreira
DOI:10.1021/acs.joc.8b00575
日期:2018.8.3
straightforward protocol integrating a sustainable approach for the synthesis of new 2,5-trans-THF nitrile derivatives enabling an easy diversification of its side chain scaffolds is described. The reaction tolerated different aromatic and alkyl substituents, affording the corresponding 2,5-trans-THFs in high diastereoselectivity. A detailed mechanistic study using DFT calculation reveals details of the ligand-exchange
描述了一个简单的协议,该协议集成了一种可持续方法,用于合成新的2,5-反-THF腈衍生物,可轻松实现其侧链支架的多样化。该反应容许不同的芳族和烷基取代基,以高非对映选择性提供相应的2,5-反-THF。使用DFT计算进行的详细机理研究揭示了配体交换步骤的详细信息,表明内球体syn进攻形成2,5-反式立体化学是最可能的途径,而排除了先前的阳离子自由基中间体。建议在均相裂解的基础上形成Co-C中间体,以得到先前提出的游离碳自由基中间体。