Efficient Copper(I)-Catalyzed S-Arylation of KSCN with Aryl Halides in PEG-400
作者:Xiaokang Li、Tangjun Yuan、Junmin Chen
DOI:10.1002/cjoc.201100209
日期:2012.3
A simple and efficient protocol for CuI‐catalyzed CS bond formation of arylhalides with KSCN to symmetrical diaryl sulfides was reported in PEG‐400 without any other additives. A variety of arylhalides were converted to the corresponding diaryl sulfides in good to excellent yields. The present procedure tolerated a variety of functional groups and the steric hindrance of ortho‐substituents on aryl
An application for dechalcogenization of aryl dichalcogenides via copper catalysis to synthesize aryl chalcogenides is disclosed. This approach is highlighted by the practical conditions, broad substrate scope, and good functional group tolerance with several sensitive groups such as aldehyde, ketone, ester, amide, cyanide, alkene, nitro, and methylsulfonyl. Furthermore, the robustness of this methodology
A highly chemoselective, efficient and nano-Pd catalyzed protocol for the rapid construction of sulfoxides and sulfones via the oxidation of symmetrical and unsymmetrical sulfides using H2O2 as an oxidant has been developed, respectively. The ready availability of starting materials, easy recovery and reutilization of the catalyst, wide substrate scope, and high yields make this protocol an attractive
已经开发出一种高度化学选择性,高效和纳米钯催化的方案,分别通过使用H 2 O 2作为氧化剂,通过对称和不对称硫化物的氧化来快速构建亚砜和砜。起始材料的可用性,催化剂的易于回收和再利用,广泛的底物范围以及高收率使得该方案成为有吸引力的替代方案。该方法还涉及无金属和微波促进的对称的二芳基硫醚的合成,以及FeCl 3介导的芳族重氮四氟硼酸盐与Na 2 S·9H 2的反应制备对称的二芳基二硫化物。O作为硫源。另外,经由K 2 CO 3介导的四氟硼酸壬二唑鎓与对称的二硫化物的反应产生了不对称的硫化物。
Diarylation of chalcogen elements using arylboronic acids via copper- or palladium-catalyzed oxidative coupling
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2016.08.012
日期:2016.9
selenium and tellurium were achieved using arylboronicacids in air. A copper-catalyzed reaction of sulfur or selenium efficiently yielded numerous symmetrical diaryl sulfides or selenides in the presence of NH4BF4. However, the diarylation of tellurium was not possible using this method, and required a palladium catalyst in the presence of KI and air for the reaction to proceed.
Palladium-Catalyzed Enantioselective C−H Olefination of Diaryl Sulfoxides through Parallel Kinetic Resolution and Desymmetrization
作者:Yu-Chao Zhu、Yan Li、Bo-Chao Zhang、Feng-Xu Zhang、Yi-Nuo Yang、Xi-Sheng Wang
DOI:10.1002/anie.201801146
日期:2018.4.23
example of PdII‐catalyzed enantioselective C−H olefination with non‐chiral or racemic sulfoxides as directing groups was developed. A variety of chiral diaryl sulfoxides were synthesized with high enantioselectivity (up to 99 %) through both desymmetrization and parallel kinetic resolution (PKR). This is the first report of PdII‐catalyzed enantioselective C(sp2)−H functionalization through PKR, and