C−H Functionalization—Prediction of Selectivity in Iridium(I)‐Catalyzed Hydrogen Isotope Exchange Competition Reactions
作者:Mégane Valero、Thomas Kruissink、Jennifer Blass、Remo Weck、Stefan Güssregen、Alleyn T. Plowright、Volker Derdau
DOI:10.1002/anie.201914220
日期:2020.3.27
of the C-H activation catalyst [(COD)Ir(IMes)(PPh3 )]PF6 (COD=1,5-cyclooctadiene, IMes=1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene) in the deuteration of phenyl rings containing different functional directing groups is divulged. Competition experiments have revealed a clear order of the directing groups in the hydrogen isotope exchange (HIE) with an iridium (I) catalyst. Through DFT calculations
CH 活化催化剂 [(COD)Ir(IMes)(PPh3 )]PF6 的评估 (COD=1,5-环辛二烯, IMes=1,3-双(2,4,6-三甲基苯基)咪唑-2-亚基)在含有不同功能导向基团的苯环的氘化中被揭示。竞争实验揭示了在铱 (I) 催化剂的氢同位素交换 (HIE) 中导向基团的清晰顺序。通过DFT计算,铱-基质配位络合物已被确定为在与两个或多个导向基团竞争的情况下反应性和选择性的主要触发因素。我们假设,只要涉及 CH 激活机制,该 HIE 反应中发现的竞争概念就可以用于解释复杂药物类型分子的其他过渡金属催化功能化反应中的区域选择性。