Influence of the N→Ru Coordinate Bond Length on the Activity of New Types of Hoveyda–Grubbs Olefin Metathesis Catalysts Containing a Six-Membered Chelate Ring Possessing a Ruthenium–Nitrogen Bond
作者:Pavel A. Kumandin、Alexandra S. Antonova、Kseniia A. Alekseeva、Eugeniya V. Nikitina、Roman A. Novikov、Kirill A. Vasilyev、Anna A. Sinelshchikova、Mikhail S. Grigoriev、Kirill B. Polyanskii、Fedor I. Zubkov
DOI:10.1021/acs.organomet.0c00647
日期:2020.12.28
efficient approach to the synthesis of new types of Hoveyda–Grubbs catalysts containing an N→Ru bond in a six-membered chelate ring is proposed. The synthesis of the organometallic compounds is based on the interaction of ready accessible 2-vinylbenzylamines and 1,3-bis(2,4,6-trimethylphenyl)-2-trichloromethylimidazolidine ligands with dichloro(3-phenyl-1H-inden-1-ylidene)bis(tricyclohexylphosphane)ruthenate
提出了一种高效的新型Hoveyda-Grubbs催化剂合成方法,该催化剂在六元螯合环中包含N→Ru键。有机金属化合物的合成基于容易获得的2-乙烯基苄胺和1,3-双(2,4,6-三甲基苯基)-2-三氯甲基咪唑烷配体与二氯(3-苯基-1 H -inden-1 )的相互作用-亚烷基)双(三环己基膦)钌酸盐,它以70-80%的收率提供了目标钌络合物。通过在不同的烯烃交叉复分解(CM)和闭环复分解(RCM)反应中测试催化剂,突出了所获得的螯合物的实用性和潜在应用领域。这些实验显示出很高的催化性能(高达10 –2mol%)在较宽的温度范围内合成的所有结构。通过X射线晶体学对所得钌催化剂的结构特性进行了彻底研究,这使得金属配合物的结构与其催化性能之间具有可靠的关联。结果表明,六元螯合环中钌与氮的键长对催化剂的稳定性和效率影响最大。通常,N→Ru键越短越强,该配合物的稳定性越高,其催化特性越差。反过来,可