A sustainable water-tolerant catalyst with enhanced Lewis acidity: Dual activation of Cp2TiCl2 via ligand and solvent
作者:Mingming Yang、Yanyan Wang、Yajun Jian、Deying Leng、Weiqiang Zhang、Guofang Zhang、Huaming Sun、Ziwei Gao
DOI:10.1016/j.mcat.2020.111247
日期:2020.12
A new strategy was developed to enhance the activity of titanocene dichloride for the synthesis of 2,4-disubstituted-3H-benzo[b]-[1,4]diazepine derivatives by using Cp2TiCl2 as a pre-catalyst. The titanocene was activated in situ in the catalytic system via the coordination with m-phthalic acid and alcohol solvent accompanied with the secession of a cyclopentadienyl ring, leading to the formation of
开发了一种新的策略,以Cp 2 TiCl 2为预催化剂,增强二氯化钛茂金属合成2,4-二取代的3H-苯并[b]-[1,4]二氮杂derivatives衍生物的活性。作为二茂钛被激活原位在催化体系通过与协调米-邻苯二甲酸和醇溶剂伴随有环戊二烯基环的分裂,导致活化的物质的形成,[CPTI(OET)2(η 1 -C 8高5 O 4)]。尤其是,新型开发的半茂钛催化剂显示出比代表性的半茂钛化合物更优异的稳定性,这不仅体现在使用30%乙醇水溶液时具有水相容性,而且还具有可回收性,即可以生成产物而不会明显降低收率。 5次运行后。总的来说,我们提出了钛茂的可持续分子催化的范例。