Ruthenium-Based Catalytic Systems Incorporating a Labile Cyclooctadiene Ligand with N-Heterocyclic Carbene Precursors for the Atom-Economic Alcohol Amidation Using Amines
作者:Cheng Chen、Yang Miao、Kimmy De Winter、Hua-Jing Wang、Patrick Demeyere、Ye Yuan、Francis Verpoort
DOI:10.3390/molecules23102413
日期:——
Herein, we identified a highly active in situ N-heterocyclic carbene (NHC)/ruthenium (Ru) catalytic system for this amide synthesis. Various substrates, including sterically hindered ones, could be directly transformed into the corresponding amides with the catalyst loading as low as 0.25 mol.%. In this system, we replaced the p-cymene ligand of the Ru source with a relatively labile cyclooctadiene
由醇和胺形成过渡金属催化的酰胺键是一种原子经济和环境友好的途径。在此,我们确定了一种用于该酰胺合成的高活性原位 N-杂环卡宾 (NHC)/钌 (Ru) 催化系统。各种底物,包括空间位阻底物,可以直接转化为相应的酰胺,催化剂负载量低至 0.25 mol.%。在该系统中,我们用相对不稳定的环辛二烯 (cod) 配体替换了 Ru 源的 p-cymene 配体,以便更有效地获得相应的聚卡宾 Ru 物种。可以预期,较弱的 cod 配体可以更容易地被多个单 NHC 配体取代。