Correlations between Substituent Effects and Catalytic Activities: A Quantitative Approach for the Development of Halogen‐Bonding‐Driven Anion‐Binding Catalysts
作者:Norie Momiyama、Atsuto Izumiseki、Naoya Ohtsuka、Toshiyasu Suzuki
DOI:10.1002/cplu.202100147
日期:2021.6
correlated, and that they were dependent on the Hammett substituent parameter, σmeta (r2=0.99). This linear correlation provided a quantitative predictive model for both the binding constant and the reaction yield. Concomitantly, this efficiently permitted the development of a highly active anion-binding catalyst, namely 4-CNC6F4I (K=489±5 M−1). Additionally, the catalytic activity of 4-CNC6F4I was established
使用 4-取代的全氟化碘苯研究了一种开发卤素键驱动的阴离子结合催化剂的定量方法。19 F NMR 滴定用于确定氯化物的结合常数K,并在N-活化吡啶的烯丙基化反应中评估它们的催化活性。我们发现 log K和产品收率呈线性相关,并且它们取决于 Hammett 取代基参数σ meta ( r 2=0.99)。这种线性相关性为结合常数和反应产率提供了定量预测模型。同时,这有效地允许开发高活性阴离子结合催化剂,即4-CNC 6 F 4 I ( K =489±5 M -1 )。此外,4-CNC 6 F 4 I的催化活性建立在N活化异喹啉的烯丙基化和巴豆化中(7 个实例)。总体而言,这种方法通过探索卤键供体催化剂开发过程中的实验相关性,突出了定量分析的价值。