copper-catalyzed C–S or C–Se bond formation between aryl iodides and easily available chalcogen sources leading to diaryl chalcogenides is reported. A variety of symmetrical diaryl sulfides and diaryl selenides were synthesized in good to excellent yields. Unsymmetrical diaryl sulfides were also obtained in moderate yields from two different aryl iodides by a one-pot tandem process. This strategy was
Ligand-Free Copper-Catalyzed Synthesis of Diaryl Thioethers from Aryl Halides and Thioacetamide
作者:Chuanzhou Tao、Jing Zhao、Aifeng Lv、Nan Zhao、Shuai Yang、Xiaolang Liu、Jian Zhou、Weiwei Liu
DOI:10.1055/s-0030-1259079
日期:2011.1
Diaryl thioethers can be prepared via a copper-catalyzed cross-coupling between aryl halides and thioacetamide using Cs2CO3 as a base and DMSO-H2O as a solvent at 120 ËC.
Catalytic Double Carbon-Boron Bond Formation for the Synthesis of Cyclic Diarylborinic Acids as Versatile Building Blocks for π-Extended Heteroarenes
作者:Takuya Igarashi、Mamoru Tobisu、Naoto Chatani
DOI:10.1002/anie.201612535
日期:2017.2.13
catalytic synthesis of cyclic diarylborinic acids is developed using a dihydroaminoborane reagent as the boron source. Unlike previously reported methods that use organolithium reagents, this method allows the easy synthesis of cyclic diarylborinic acids bearing a range of functionalities including CN, CO2Et, CONEt2 and NMeCO2tBu. Furthermore, these cyclic diarylborinic acids provide rapid access to
环状二芳基硼酸的第一次催化合成是使用二氢氨基硼烷试剂作为硼源进行的。与先前报道的使用有机锂试剂的方法不同,该方法可轻松合成带有CN,CO 2 Et,CONEt 2和NMeCO 2 t Bu等一系列功能的环状二芳基硼酸。此外,这些环状二芳基硼酸提供了快速进入骨骼多样性的途径,尤其是它们能够通过简单的交叉偶联反应合成六元至九元π扩展的杂芳烃,这在先进材料和药物中都是重要的合成靶标。
Dechalcogenization of Aryl Dichalcogenides to Synthesize Aryl Chalcogenides via Copper Catalysis
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