Bidentate Lewis Acids for the Activation of 1,2-Diazines - A New Mode of Catalysis
作者:Simon N. Kessler、Markus Neuburger、Hermann A. Wegner
DOI:10.1002/ejoc.201100335
日期:2011.6
Bidentate Lewis acids were applied as catalysts for the inverse-electron-demand Diels–Alder (IEDDA) reaction of 1,2-diazines. The concept of catalysis is based on the coordination of the bidentate Lewis acid to both nitrogen atoms of the 1,2-diazine moiety, thereby reducing the electron density and lowering the energy of the LUMO. This should, according to frontier molecular orbital (FMO) theory, facilitate
双齿路易斯酸被用作 1,2-二嗪逆电子需求 Diels-Alder (IEDDA) 反应的催化剂。催化的概念基于双齿路易斯酸与 1,2-二嗪部分的两个氮原子的配位,从而降低电子密度并降低 LUMO 的能量。根据前沿分子轨道 (FMO) 理论,这应该有利于环加成步骤。这一新概念已成功应用于各种亲双烯体和取代的酞嗪底物。对该机制的仔细研究导致了关键中间体的分离和表征;所有这些都支持所提出的催化循环。