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。
Lithium 1,1-diadamantylamide (LDAM) base-promoted insertion of arynes into disulfide S–S bonds is described. After generation of arynes from readily available aryl halides and triflates, reactions with diaryl and diisopropyl disulfides afford the insertion products in moderate to excellent yields. Use of 1-cyclohexenyl triflate gave an excellent yield of 1,2-bis(phenylthio)cyclohexene.
Microwave-assisted Ullmann-Buchwald C-S bond formation using a copper(I) catalyst and trans-cyclohexane-1,2-diol as ligand
作者:Mark C. Bagley、Vincenzo Fusillo、Edward G. B. Hills、Alex T. Mulholland、Joseph Newcombe、Leanne J. Pentecost、Emily L. Radley、Bethan R. Stephens、Christopher C. Turrell
DOI:10.3998/ark.5550190.0013.720
日期:——
aryl halide (1 equiv.) in 2propanol at 120 °C for three hours in the presence of K2CO3 (2 equiv.) as base usingcopper(I) iodide as catalyst (5 mol%) and trans-cyclohexane-1,2-diol (2 equiv.) as ligand provides a rapid and convenient method for C−Sbondformation. The process is most efficient using thiophenol and aryl iodide precursors, both of which may contain electron-donating and electronwithdrawing
Environmentally Friendly and Recyclable CuCl2-Mediated C–S Bond Coupling Strategy Using DMEDA as Ligand, Base, and Solvent
作者:Guodong Shen、Xianqiang Huang、Qichao Lu、Zeyou Wang、Weiwei Sun、Yalin Zhang、Manman Sun、Zhiming Wang
DOI:10.1055/a-1561-5508
日期:2022.1
Simple reaction conditions and recyclable reagents are crucial for environmentally friendly industrial applications. An environment-friendly, recyclable and economic strategy was developed to synthesize diaryl chalcogenides by the CuCl2-catalyzed C–S bond-formation reaction via iodobenzenes and benzenethiols/1,2-diphenyldisulfanes using N,N′-dimethylethane-1,2-diamine (DMEDA) as ligand, base, and solvent
Generation of Aryl Radicals from Aryl Halides: Rongalite-Promoted Transition-Metal-Free Arylation
作者:Fazhi Yu、Runyu Mao、Mingcheng Yu、Xianfeng Gu、Yonghui Wang
DOI:10.1021/acs.joc.9b01113
日期:2019.8.16
is reported. Rongalite as a novel precursor of super electron donors was used to initiate a series of electron-catalyzed reactions under mild conditions. These transition-metal-free radical chain reactions enable the efficient formation of C–C, C–S, and C–P bonds through homolytic aromatic substitution or SRN1 reactions. Moreover, the synthesis of antipsychoticdrug Quetiapine was performed on gram