Air-stable Ruthenium(II)-NNN Pincer Complexes for the Efficient Coupling of Aromatic Diamines and Alcohols to 1<i>H</i>
-benzo[<i>d</i>
]imidazoles with the Liberation of H<sub>2</sub>
作者:Lin Li、Qi Luo、Huahua Cui、Renjie Li、Jing Zhang、Tianyou Peng
DOI:10.1002/cctc.201800017
日期:2018.4.9
Two new phosphine‐free RuII‐NNN pincer complexes ([RuCl(L1)(CH3CN)2]Cl (1) and [RuCl(L2)(CH3CN)2]Cl (2) [L1=2,6‐bis(1H‐imidazole‐2‐yl)pyridine, L2=2,6‐bis(1‐hexyl‐1H‐imidazole‐2‐yl)pyridine] were synthesized to catalyze the condensation of benzyl alcohol and benzene‐1,2‐diamine homogeneously to 2‐pheny‐1H‐benzo[d]imidazole and H2. The reactivity in the order of 1>2 is lower than that of the phosphine‐containing
两个新的无膦Ru II - NNN钳形配合物([RuCl(L1)(CH 3 CN)2 ] Cl(1)和[RuCl(L2)(CH 3 CN)2 ] Cl(2)[ L1 = 2,合成6-二(1 H-咪唑-2-基)吡啶,L2 = 2,6-二(1-己基-1 H-咪唑-2-基)吡啶]以催化苄醇与苯的缩合反应。 1,2-二胺与2-苯基-1 H-苯并[ d ]咪唑和H 2均相,反应性顺序为1 > 2比含膦钌的下部II -NNN钳形络合物将[RuCl 2(L1)(PPH 3)3 ](3),因此均匀的含有系统1(i,1当量的1,2-双二苯基膦乙烷)和10当量的NaBPh 4被开发出来,以提高伯醇和苯1,2-二胺(或其衍生物)到2-取代的1 H-苯并[ d ]咪唑的缩合催化效率,且收率很高。 (最高97%)和营业额(388)。该系统可用于实现1 H苯并[ d]的简便一步合成。来自醇的对咪唑衍生物,而无需使用氧