compounds were fully characterized by 1H, 13C1H} NMR and FT-IR spectra. The structures of 2c, 2d, and 2e were determined by X-ray crystallography and the prepared complexes (2a-e) were investigated as catalysts for the direct arylation of 2-n-propylthiazole, 4,5-dimethylthiazole and 2-acetylthiophene with various aryl bromides. High catalytic activity for arylation was seen reaction using only 0.5 mol%
在富含电子的杂芳烃的情况下,可以使用芳基卤化物活化特定的C H键进行芳基化,而无需指导该基团。容易产生卤素取代的芳基化杂芳烃的能力在有机化学中很重要,因为这些物种是生物化学家的重要组成部分。在此手稿中,我们报告了PEPPSI型新型苯并咪唑基N-杂环卡宾-钯(II)配合物(2a-e)的合成。所有这些新化合物均通过1 H,13 C 1 H} NMR和FT-IR光谱进行了全面表征。通过X射线晶体学确定2c,2d和2e的结构,并制备配合物(研究了2a-e)作为2-正丙基噻唑,4,5-二甲基噻唑和2-乙酰基噻吩与各种芳基溴直接芳基化的催化剂。仅使用0.5mol%的催化剂反应1小时,观察到高的芳基化催化活性。
Palladium(II)- N -heterocyclic carbene-catalyzed direct C2- or C5-arylation of thiazoles with aryl bromides
作者:Murat Kaloğlu、İsmail Özdemir
DOI:10.1016/j.tet.2018.03.026
日期:2018.6
their corresponding palladium(II)-NHC complexes with the general formula [PdCl2(NHC)2] were synthesized. All new compounds were characterized by 1H NMR, 13C NMR, IR spectroscopy and elemental analysis techniques. The catalytic activity of palladium(II)-NHC complexes was investigated in the direct C2- or C5-arylation of thiazoles with aryl bromides in presence of palladium(II)-NHC at 150 °C for 1 h. These
在此我们报道,合成了一系列新的苯并咪唑氯化物作为N-杂环卡宾(NHC)配体及其相应的通式为[PdCl 2(NHC)2 ]的钯(II)-NHC配合物。所有新化合物均通过1 H NMR,13 C NMR,IR光谱和元素分析技术进行表征。在钯(II)-NHC的存在下于150°C进行1 h的噻唑与芳基溴的直接C2-或C5-芳基化反应中,研究了钯(II)-NHC配合物的催化活性。这些配合物对噻唑直接芳基化表现出良好的催化性能。噻唑的芳基化以中等至高产率选择性地产生C 2或C 5芳基化的噻唑。
Synthesis of novel palladium(II) N-heterocyclic carbene complexes and their catalytic activities in the direct C5 arylation reactions
作者:Murat Yiğit、Beyhan Yiğit、Yetkin Gök
DOI:10.1016/j.ica.2016.07.055
日期:2016.11
Abstract New palladium(II) N-heterocyclic carbenecomplexes have been easily obtained in good yields from the carbene transfer reaction of silver-NHC complexes with PdCl 2 (PhCN) 2 and characterized by elemental analysis, 1 H NMR and 13 C NMR spectroscopy. These complexes were used as catalysts in the direct C5 arylation of 2- n -butylfuran, 2- n -butylthiophene and 2- n -propylthiazole with various
摘要银-NHC配合物与PdCl 2(PhCN)2的卡宾转移反应可容易地以高收率获得新型钯(II)N-杂环卡宾配合物,并通过元素分析,1 H NMR和13 C NMR光谱进行了表征。这些配合物在N,N-二甲基乙酰胺(DMAc)中在130°C下于2-正丁基呋喃,2-正丁基噻吩和2-正丙基噻唑与各种芳基溴化物的直接C5芳基化反应中用作催化剂。芳基化反应是区域选择性的,并且在所有情况下,仅形成C5芳基化的产物。通过使用0.5mol%的钯-NHC络合物,以中等至良好的产率获得了相应的芳基化产物。
Synthesis of silver(I) and palladium(II) N-heterocyclic carbene complexes and their use as catalysts for the direct C5 arylation of heteroaromatic compounds
complexes were tested as catalysts in the direct C5 arylation of 2-n-butylfuran, 2-n-butylthiophene and 2-n-propylthiazole with aryl bromides at 130 °C in N,N-dimethylacetamide. The arylation reactions proceeded selectively at the C5 position of the heteroaromatic compounds, and the corresponding coupling products were obtained in moderate to good yields by using 0.5 mol% of the palladium complex.
Abstract New palladium N -heterocyclic carbene (NHC) complexes ( 1a–e ) were synthesized in very good yields by the reaction of 1-phenyl-3-alkylbenzimidazolium salts with Pd(OAc) 2 in dimethyl sulfoxide. These synthesized complexes were fully characterized using elemental analyses, FT-IR, 1 H NMR, 13 C NMR and LC–MS (for 1a , 1c and 1e ) spectroscopy data. Also, the molecularstructure of the bis[1-phenyl-3-(2-methyl-1
摘要通过1-苯基-3-烷基苯并咪唑鎓盐与Pd(OAc)2在二甲亚砜中的反应,以非常高的收率合成了新型钯N-杂环卡宾(NHC)配合物(1a–e)。这些合成的复合物使用元素分析,FT-IR,1 H NMR,13 C NMR和LC-MS(对于1a,1c和1e)光谱数据进行了充分表征。另外,通过单晶X射线衍射对结构的双[1-苯基-3-(2-甲基-1,4-苯并二恶烷)苯并咪唑-2-亚丙基]二溴钯(II)的分子结构进行了表征。学习。新的Pd II配合物(1a–e)在130°C的条件下,在2-正丁基呋喃,2-正丁基噻吩和2-正丙基噻唑与各种芳基溴的直接C5芳基化反应中用作催化剂进行了测试。还,为了进行比较,使用芳基氯化物进行了一些实验。结果报告在本文中。在给定条件下,这些配合物表现出相当高的催化活性。