Palladium-catalyzed phenyl-selenylation with n-Bu3SnSePh in one-pot two-step reactions
摘要:
We have studied the Pd-catalyzed cross-coupling reaction of a stannane derived from selenium n-Bu3SnSePh (1) with aryl and perfluoroalkyl iodides. Herein it very efficient one-pot two-step selenylation reaction to form a C-Se bond is reported. Ph2Se2 reacts with Na metal in liquid ammonia yielding PhSe- ions. To this solution n-Bu3SnCl was added to afford 1, which was introduced in the palladium-catalyzed Coupling reaction without isolation. These reactions afford functionalized diarylselenides and phenylperfluroalkyl selenides from good to high yields (38-98%). (c) 2006 Elsevier Ltd. All rights reserved.
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。
Efficient Heterogeneous Copper-Catalysed C–Se Coupling of Aryl Iodides with Symmetrical Diselenides towards Unsymmetrical Monoselenides
作者:Ruonan Zhao、Chenyu Yan、Yuanyuan Jiang、Mingzhong Cai
DOI:10.3184/174751918x15409874473285
日期:2018.11
A highly efficient heterogeneous copper(I)-catalysed C–Se coupling of aryl iodides with diaryl diselenides was achieved in dimethylformamide at 110 °C under neutral conditions by using a 10 mol% of bipyridine-functionalised MCM-41-supported copper(I) complex [bpy-MCM-41-CuI] as the catalyst and magnesium as the reductive reagent, yielding a variety of unsymmetrical diaryl selenides in good to excellent
diaryl selenides has been developed by a copperferritenanoparticle catalyzed reaction of aryl iodides/aryl bromides with diphenyldiselenide in the presence of base and solvent at 120 °C. Using this protocol, a variety of diselenides were obtained in good to excellent yields. The copperferritenanoparticles were magnetically separated, recycled, and reused up to three cycles.
在碱和溶剂存在下,在 120 °C 下,通过铁氧体铜纳米粒子催化芳基碘化物/芳基溴化物与二苯基二硒化物反应,开发了一种简单有效的合成二芳基硒化物的方法。使用该协议,以良好到极好的收率获得了多种二硒化物。铜铁氧体纳米粒子被磁性分离、回收和重复使用最多三个循环。
Microwave-Assisted Copper-Catalyzed Preparation of Diaryl Chalcogenides
作者:Sangit Kumar、Lars Engman
DOI:10.1021/jo060690a
日期:2006.7.1
Diaryl chalcogenide synthesis employing diaryl dichalcogenides and aryl halides as starting materials in the presence of excess magnesium and a catalytic amount of CuI/bipyridyl is significantly improved by microwave heating. Reaction times can be reduced from 2 to 3 days to 6−8 h. Both arylbromides and aryl chlorides can be used as substrates in the substitution reaction. The procedure is useful
DMSO/iodine-catalyzed oxidative C–Se/C–S bond formation: a regioselective synthesis of unsymmetrical chalcogenides with nitrogen- or oxygen-containing arenes
作者:Sumbal Saba、Jamal Rafique、Antonio L. Braga
DOI:10.1039/c5cy01503k
日期:——
greener protocol to access different types of unsymmetrical chalcogenides with nitrogen- or oxygen-containing arenes through oxidative C–Se/C–S formation via direct C(sp2)–H bond activation was developed. The products were obtained in good to excellent yields using [O or N]-containing arenes, half equiv. of various odorless diorganyl dichalcogenides (S/Se), iodine (20 mol%) as the catalyst and 3 equiv