Rhodium-Catalyzed Reductive Coupling of Disulfides and Diselenides with Alkyl Halides, Using Hydrogen as a Reducing Agent
作者:Kaori Ajiki、Masao Hirano、Ken Tanaka
DOI:10.1021/ol051588n
日期:2005.9.1
[reaction: see text] We have established that RhCl(PPh3)3 catalyzes a reductive coupling of disulfides and diselenides with alkyl halides in the presence of triethylamine using hydrogen as a reducing agent. This reaction serves as a convenient new method to produce unsymmetrical sulfides and selenides from disulfides and diselenides instead of unstable and odoriferous thiols and selenols.
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。
Copper-catalyzed direct thiolation of azoles with aliphatic thiols
Cu(II)-catalyzed direct thiolation of azoles with thiols is described via intermolecular C–S bond formation/C–H functionalization under oxidative conditions. Both aryl thiols and aliphatic thiols are used as coupling partners, and furnished the thiolation products in moderate to good yields. The reaction is compatible with a wide range of heterocycles including oxazole, thiazole, imidazole and oxadiazole.
Ni-Catalyzed Reductive Liebeskind–Srogl Alkylation of Heterocycles
作者:Yuanhong Ma、Jose Cammarata、Josep Cornella
DOI:10.1021/jacs.8b13534
日期:2019.2.6
Herein we present a Ni-catalyzed alkylation of C–SMe with alkyl bromides for the decoration of heterocyclic frameworks. The protocol, reminiscent to the Liebeskind–Srogl coupling, makes use of simple C(sp2)–SMe to be engaged in a reductive coupling. The reaction is suitable for a preponderance of highly valuable heterocyclic motifs. In addition to cyclic bromides, noncyclic alkyl bromides are well
在此,我们提出了用烷基溴对 C-SMe 进行 Ni 催化烷基化,用于装饰杂环骨架。该协议让人想起 Liebeskind-Srogl 耦合,利用简单的 C(sp2)-SMe 进行还原耦合。该反应适用于占优势的高价值杂环基序。除了环溴化物外,非环烷基溴化物也能很好地适应异构化的保留水平。该协议是可扩展的,并允许在存在其他功能化句柄的情况下进行正交耦合。
Palladium-Catalyzed Coupling of N-Heteroaryl Sulfides with Organozinc Reagents
The palladium-catalyzed cross-coupling of N-heteroaryl sulfides with organozinc reagents was developed. Scope and limitation of the reaction regarding generality of zinc reagents and substrate were also investigated.