A Simple Copper Salt-Catalyzed Synthesis of Unsymmetrical Diaryl Selenides and Tellurides from Arylboronic Acids with Diphenyl Diselenide and Ditelluride
作者:Lei Wang、Min Wang、Fuping Huang
DOI:10.1055/s-2005-871936
日期:——
In the presence of a catalytic amount of simple copper salt, the reaction of arylboronic acids with diphenyl diselenide and ditelluride was accomplished without any additive to afford the corresponding unsymmetrical diarylselenides and tellurides in good yields.
The efficient and mild copper-catalyzed synthesis of unsymmetrical diorganyl chalcogenides under ligand- and solvent-free conditions is described. The cross-coupling reaction was performed using aryl boric acids and 0.5 equiv. of diorganyl dichalcogenides (Te/Se/S) in the presence of 3 mol % of CuI and 3 equiv. of DMSO, under microwave irradiation. This new protocol allowed the preparation of several
A transition-metal-free synthetic method has been developed for the synthesis of unsymmetrical diaryl chalcogenides (S, Se, and Te) from diaryl dichalcogenides and arenes under oxidative conditions by using potassium persulfate at room temperature. Variously substituted arenes such as anisole, thioanisole, diphenyl ether, phenol, naphthol, di- and trimethoxy benzenes, xylene, mesitylene, N,N-dimethylaniline
已开发出一种无过渡金属的合成方法,该方法用于在室温条件下通过使用过硫酸钾,在氧化条件下由二芳基二卤化锑和芳烃合成不对称的二芳基硫属元素化物(S,Se和Te)。各种取代的芳烃,例如苯甲醚,硫代苯甲醚,二苯醚,苯酚,萘酚,二和三甲氧基苯,二甲苯,均三甲苯,N,N-二甲基苯胺,溴取代的芳烃,萘和二芳基二卤化碳经历了碳硫族键形成反应在三氟乙酸中生成不对称的二芳基硫属元素化物。为了理解反应的机理部分,由77进行了详细的中间体原位表征通过使用二苯基二硒化物为底物进行Se NMR光谱分析。77 Se NMR研究表明,亲电子物质ArE +是由二芳基二卤化二硫化物与过硫酸盐在三氟乙酸中反应生成的。芳基硫属元素离子对芳烃的亲电攻击可能是芳基-硫属元素键形成的原因。
Merging visible-light photoredox and micellar catalysis: arylation reactions with anilines nitrosated <i>in situ</i>
作者:Mei-jie Bu、Guo-ping Lu、Jianzhong Jiang、Chun Cai
DOI:10.1039/c8cy01221k
日期:——
utilized as the photocatalyst, and Triton X-100 was employed as the surfactant; both are inexpensive and commercially available. This clean and energy-saving catalytic system enables photocatalytic reactions of the diazonium ion generated in situ to proceed smoothly in water without any co-solvents or additives at room temperature.
Simple and catalyst-free method for the synthesis of diaryl selenides by reactions of arylselenols and arenediazonium salts
作者:Renata A. Balaguez、Vanessa Gentil Ricordi、Camilo S. Freitas、Gelson Perin、Ricardo F. Schumacher、Diego Alves
DOI:10.1016/j.tetlet.2013.12.086
日期:2014.1
catalyst-free method to synthesize diaryl selenides by reaction of arenediazonium tetrafluoroborate salts with arylselenols, generated in situ by using diaryl diselenides and hypophosphorous acid (H3PO2), using THF as solvent. This is a direct nucleophilic aromatic substitution (SNAr) reaction performed with diaryl diselenides and arenediazoniumsalts bearing electron-withdrawing and electron-donating
我们在此描述一种简单且无催化剂的方法,该方法是通过使用二芳基二硒化物和次磷酸(H 3 PO 2),以四氢呋喃为溶剂,通过四氟硼酸芳族重氮鎓盐与芳基硒醇的反应来合成二芳基硒化物。这是直接的亲核芳族取代(SNAr)反应,使用带有吸电子和供电子基团的二芳基二硒化物和烯二唑鎓盐以中等至良好的收率提供相应的二芳基硒化物。