Organometallic titanocene complex as highly efficient bifunctional catalyst for intramolecular Mannich reaction
作者:Yunyun Wang、Yajun Jian、Ya Wu、Huaming Sun、Guofang Zhang、Weiqiang Zhang、Ziwei Gao
DOI:10.1002/aoc.4925
日期:2019.7
Bifunctional catalysts bearing two catalytic sites, Lewis acidic organometallic titanocene and Brønsted acidic COOH, have been assembled in situ from Cp2TiCl2 with carboxylic acid ligands, showing high catalytic activity over an intramolecular Mannich reaction towards synthesis of 2‐aryl‐2,3‐dihydroquinolin‐4(1H)‐ones. The determination of the bifunctional catalyst Cp2Ti(C8H4NO6)2 was elucidated by
具有羧酸催化配体的Cp 2 TiCl 2原位组装了带有两个催化位点的Lewis酸性有机金属钛茂和Brønsted酸性COOH双功能催化剂,在分子内曼尼希反应中对2-芳基-2,3的合成显示出高催化活性。 -dihydroquinolin-4(1H)-1。双功能催化剂Cp 2 Ti(C 8 H 4 NO 6)2的测定单个X射线HRMS和催化行为的研究阐明了这一点。特别是,用休眠的COOMe掩盖布朗斯台德酸性COOH催化位点会大大降低反应产率,这表明两个催化位点共同作用以保持高催化效率。