Nickel(0)-catalyzed Synthesis of Diaryl Sulfides from Aryl Halides and Aromatic Thiols
作者:Kentaro Takagi
DOI:10.1246/cl.1987.2221
日期:1987.11.5
Facile and selective syntheses of various diaryl sulfides from aryl halides and aromatic thiols by the aid of an in situ generated nickel(0) catalyst are reported. The nickel(0) induces a C–S cleavage, as well.
Synthesis of Diaryl Ethers, Diaryl Sulfides, Heteroaryl Ethers and Heteroaryl Sulfides under Microwave Dielectric Heating
作者:Quanrui Wang、Feng Li、Qingqing Meng、Huansheng Chen、Zhiming Li、Fenggang Tao
DOI:10.1055/s-2005-865321
日期:——
This paper describes the synthesis of diaryl ethers and sulfides by utilizing microwave heating methodology. The methodology is shown to be rapid and efficient for the coupling of phenols or thiophenol with electron-deficient aryl halides through a SNAr reaction. The scope of the protocol can be expanded to six-membered heterocycles bearing a hydroxyl group as well as to the reaction of 2-pyrimidinethiol with mildly activated aryl halides, providing heteroaryl ethers and sulfides, respectively. The advantages of the present method include the wide substrate scope, the obviation of metal catalysts, ease of product isolation, and high purity of products.
Properly substituted diazosulfides XC6H4-N=N-SPh () (either isolated or generated from arenediazonium tetrafluoroborates and sodium benzenethiolate) react with tetrabutylammonium cyanide, in Me2SO under photon or electron stimulation, leading to nitriles XC6H4CN (). Satisfactory yields of , comparable with those of the Sandmeyer reaction, are obtained when X = 3- or 4-CF3 , 2-, 3-, or 4-CN, 4-F, 4-MeO
适当取代的重氮硫化物XC 6 H 4 -N = N-SPh()(由四氟硼酸芳族重氮鎓和苯硫代硫酸钠分离或产生)在光子或电子刺激下在Me 2 SO中与氰化四丁基铵反应,生成腈XC 6 H 4 CN ()。的令人满意的产率,与那些Sandmeyer反应的可比性,获得当X = 3或4-CF 3,2-,3-,或4-CN,4-F,4-的MeO,3-梅科,4- NO 2,4-PhCO和4- PhSO 2。由于不同的原因,当X = H,4-MeO,2-或3-NO 2时,该反应实际上无法作为有用的腈合成反应。收集到的证据与S RN 1机制的干预非常吻合,重氮化合物由于易于还原并随后迅速断裂CN和NS键而成为重参与反应的底物。所涉及的机理的重要结果是溴代和氯代衍生物(:X = Br,Cl)的行为,它们通过同时引入两个氰基官能团,导致相应二氰基苯的收率令人满意。
CsOH·H<sub>2</sub>O-Promoted Synthesis of Aryl Sulfides via Direct Coupling of Aryl Halides and Thiols
作者:Ravi Varala、E. Ramu、M. Mujahid Alam、Srinivas R. Adapa
DOI:10.1246/cl.2004.1614
日期:2004.12
We report here our observation that, using appropriate reaction conditions, CsOH·H2O-promoted coupling of aryl halides with thiols can be performed in moderate to good yields without a transition metal catalyst.
Achieving Nickel Catalyzed C–S Cross-Coupling under Mild Conditions Using Metal–Ligand Cooperativity
作者:Rina Sikari、Suman Sinha、Siuli Das、Anannya Saha、Gargi Chakraborty、Rakesh Mondal、Nanda D. Paul
DOI:10.1021/acs.joc.9b00075
日期:2019.4.5
thiols and (hetero)aryl halides under mild conditions, mostly at room temperature, catalyzed by well-defined singlet diradical Ni(II) catalysts bearing redox noninnocent ligands is reported. Taking advantage of ligand centered redox events, the high-energetic Ni(0)/Ni(II) or Ni(I)/Ni(III) redox steps were avoided in the catalyticcycle. The cooperative participation of both nickel and the coordinated ligands