一系列不对称取代的ñ -杂环卡宾(NHC)的前体(1A,1B,1C,1D,1E)从反应合成Ñ -phenylbenzimidazole与各种烷基卤。这些化合物用于合成NHC-silver(I)配合物(2a,2b,2c,2d,2e)。五种新的1-苯基-3-烷基苯并咪唑鎓盐(1a,1b,1c,1d,1e)及其NHC-银络合物(2a,2b,2c,2d,2e)通过1 H NMR,13 C NMR和FT-IR光谱法以及元素分析技术表征。同样,两个NHC-银配合物2b和2c的特征在于单晶X射线晶体学,证实了C-Ag-Cl的线性排列。测试了NHC前体和NHC-银复合物对三种革兰氏阳性细菌菌株(枯草芽孢杆菌,单核细胞增生李斯特菌和金黄色葡萄球菌)和三种革兰氏阴性细菌菌株(大肠杆菌,肺炎克雷伯菌)的抗菌活性。和铜绿假单胞菌(Pseudomonas aeruginosa))。NHC-银复合物显示出比NHC前体
Dichlorido(3-chloropyridine-N)[1,3-dialkylbenzimidazol-2-ylidene]palladium(II) complexes: Synthesis, characterization and catalytic activity in the arylation reaction
作者:Senem Akkoç、Yetkin Gök
DOI:10.1016/j.ica.2015.01.019
日期:2015.4
Six novel Pyridine Enhanced Precatalyst Preparation, Stabilization and Initiation (PEPPSI) themed palladium N-heterocyclic carbene (Pd-NHC) complexes (2a-f) were synthesized in good yields from the reaction of 1,3-dialkylbenzimidazolium salts with PdCl2 in the presence of K2CO3 as base in 3-chloropyridine. These synthesized complexes were characterized by means of elemental analysis, FT-IR, H-1 and C-13 NMR spectroscopic methods. The fully characterized novel complexes (2a-f) were tested as catalysts in the direct arylation of 2-n-propylthiazole, 2-n-butylthiophene and 2-n-butylfuran with different aryl bromides at 130 degrees C for 1 h. The complexes exhibited fairly high catalytic activities under the given conditions. The highest conversions were achieved when complexes 2a, 2e and 2f were used as catalysts in direct arylation. (C) 2015 Elsevier B.V. All rights reserved.