Copper-Mediated C–H Activation/C–S Cross-Coupling of Heterocycles with Thiols
作者:Sadananda Ranjit、Richmond Lee、Dodi Heryadi、Chao Shen、Ji’En Wu、Pengfei Zhang、Kuo-Wei Huang、Xiaogang Liu
DOI:10.1021/jo2017444
日期:2011.11.4
oles by directthiolation of benzothiazoles with aryl or alkyl thiols via copper-mediated aerobic C–H bond activation in the presence of stoichiometric CuI, 2,2′-bipyridine and Na2CO3. We also show that the approach can be extended to thiazole, benzimidazole, and indole substrates. In addition, we present detailed mechanistic investigations on the Cu(I)-mediated directthiolationreactions. Both computational
我们报告了在化学计量的CuI,2,2'-联吡啶存在下,通过铜介导的需氧C–H键活化,通过苯并噻唑与芳基或烷基硫醇的直接硫醇化反应,合成了一系列芳基或烷基取代的2-巯基苯并噻唑和Na 2 CO 3。我们还表明该方法可以扩展到噻唑,苯并咪唑和吲哚底物。此外,我们目前对Cu(I)介导的直接硫醇化反应的详细机理研究。计算研究和实验结果均表明,铜-硫醇盐络合物[(L)Cu(SR)](L:基于氮的双齿配体,例如2,2'-联吡啶; R:芳基或烷基)是第一反应性负责观察到的有机转化的中间体。此外,我们的计算研究表明,基于氢原子提取途径的逐步反应机理,比包括β-氢化物消除,单电子转移,氢原子转移,氧化加/还原消除和σ在内的许多其他可能途径在能量上更可行。键易位。
C3 Sulfenylation of N-Heteroarenes in Water under Catalyst-Free Conditions
We describe herein a catalyst-free selective C−H sulfenylation of imidazo[1,2-a]pyridines using sulfonothioates as odorless source of thioarylated reagent in an aqueous medium. The method works for a variety of substitutedimidazo[1,2-a]pyridines with broad functional group tolerance. The methodology has been extends to selective sulfernylation of indoles and imidazothiazoles. The sulfonothioates are
The copper-catalyzed sulfenylation of indoles with aryl iodide and sulfur powder has been investigated both experimentally and theoretically. This protocol provides a direct and facile approach to prepare 3-sulfenylindoles with moderate to excellent yields and good functional-group tolerance. The in-situ IR analysis provided evidence for that NaOAc could promote the synthesis of diphenyl disulfide by
NH4I/1,10-phenanthroline catalyzed direct sulfenylation of N-heteroarenes with ethyl arylsulfinates
作者:Lingjuan Chen、Jun Zhang、Yueting Wei、Zhen Yang、Ping Liu、Jie Zhang、Bin Dai
DOI:10.1016/j.tet.2019.130664
日期:2019.11
10-phenanthroline-catalyzed direct sulfenylation reactions was reported. In this reaction, heteroarenes such as indoles, and pyrroles serve as nucleophiles by installing a arylthio group at the C3 and C2 position of heterocycles, respectively. With readily accessible and free of unpleasant odor ethyl arylsulfinates as sulfur reagents, the metal-free-catalyzed direct sulfenylation of N-heteroarenes has been
据报道,通过NH 4 I / 1,10-菲咯啉催化的直接亚磺酰基化反应可有效合成N-杂环芳基硫化物。在该反应中,通过在杂环的C 3和C 2位置分别安装芳硫基,使杂芳烃如吲哚和吡咯成为亲核试剂。随着容易获得并且没有令人不愉快的气味的芳基亚磺酸乙酯作为硫试剂,已经开发了无金属催化的N-杂芳烃的直接亚磺酰基化。即使在克规模上,也以中等至优异的产率获得了3-芳硫基吲哚和2-芳硫基吡咯的衍生物。该反应对于广泛的底物是通用的,并且显示出对多种官能团的良好耐受性。
Combined experimental/theoretical study on <scp>d</scp>-glucosamine promoted regioselective sulfenylation of indoles catalyzed by copper
A combined experimental/theoretical investigation on the D-Glucosamine promoted sulfenylation of indoles at the C3 position with sodium sulfinates catalyzed by copper is presented. The C3-sulfenylation of indoles shows good functional-group tolerance and yield. The 3-I-indole was identified as a crucial intermediate in the catalytic cycle. The catalytic role of [Cu(DMSO)2]2+ was addressed using quantum