Experimental and Computational Mechanistic Studies of the β‐Diketiminatoiron(II)‐Catalysed Hydroamination of Primary Aminoalkenes
作者:Clément Lepori、Elise Bernoud、Régis Guillot、Sven Tobisch、Jérôme Hannedouche
DOI:10.1002/chem.201804681
日期:2019.1.14
A comprehensive mechanistic study by means of complementary experimental and computational approaches of the exo‐cyclohydroamination of primary aminoalkenes mediated by the recently reported β‐diketiminatoiron(II) complex B is presented. Kinetic analysis of the cyclisation of 2,2‐diphenylpent‐4‐en‐1‐amine (1 a) catalysed by B revealed a first‐order dependence of the rate on both aminoalkene and catalyst
通过互补试验和的计算方法的装置的综合机理研究外由最近报道β-diketiminatoiron介导的初级aminoalkenes的-cyclohydroamination(II)络合物乙呈现。由B催化的2,2-二苯基五-4-烯-1-胺(1 a)环化的动力学分析表明,速率对氨基烯烃和催化剂浓度的一级依赖性以及一次动力学同位素效应(KIE) (k H / k D)为2.7(90°C)。得到的Eyring分析Δ ħ ≠ = 22.2千卡摩尔-1,Δ小号≠ = -13.4 CAL摩尔-1 K -1。直接分子内加氢胺化和氧化胺化的竞争途径的合理的机械途径已通过计算进行了仔细研究。在存在明显较快的σ插入途径的情况下,动力学上质子辅助的协调一致的N / C / H键形成非插入途径被认为是不可及的。此手术途径涉及1)快速和可逆的顺式烯烃进入Fe-N系列的-migratory 1,2-插入酰氨σ键在单体N