通常,可用于合成硫属元素金属的方法与苛刻条件,使用昂贵的金属,适用性广,纯化过程繁琐和收率低的缺点有关。为避免这些缺点,芳基取代的1,3-二烯基溴化物与硒氰酸钾/硫化钾(KSeCN / K 2S)导致了相应的硒代苯并噻吩的开发。碘相对较温和,价格便宜并且容易获得。通过该方法已经以高收率获得了几种不同取代的硒代苯并噻吩。使用该程序2-(4-氯苯基)噻吩,一种合成黑色素浓缩激素受体配体的关键中间体,参与了饮食失调,体重增加,肥胖,抑郁和焦虑症的治疗。尽管该反应基本上是一锅的,但它分两个步骤进行,涉及硒代氰酸酯/硫醇盐中间体,从而导致硒烯/噻吩。简单的操作,使用廉价的试剂和无金属的工艺使该程序对于容易获得取代的硒代苯并噻吩具有更大的吸引力。
A palladium-catalyzed (Pd(PPh3)4/Ag2O/PivOH) C2-regioselective direct dehydrogenative alkynylation of unsubstituted selenophene was achieved. The selenophenes substituted with R1 groups at 2-position can be C5-alkynylated with a variety of 4-substituted phenylacetylenes (R2 groups). The R1 and R2 can be either electron-withdrawing or electron-donating groups, demonstrating a wide range of substrate
Nickel-catalyzed and Li-mediated regiospecific C–H arylation of benzothiophenes
作者:Yorck Mohr、Gaëlle Hisler、Léonie Grousset、Yoann Roux、Elsje Alessandra Quadrelli、Florian M. Wisser、Jérôme Canivet
DOI:10.1039/d0gc00917b
日期:——
A nickel-based catalytic system for the regiospecific C2–H arylation of benzothiophene has been established. NiCl2(bpy) is used as a catalyst in combination with LiHMDS as a base in dioxane. The catalytic system is applicable to a variety of functionalized benzothiophenes, as well as other heteroarenes including thiophene, benzodithiophene, benzofuran and selenophene in combination with iodo aryl electrophiles
Anion Recognition by Neutral Chalcogen Bonding Receptors: Experimental and Theoretical Investigations
作者:Encarnación Navarro‐García、Bartomeu Galmés、María D. Velasco、Antonio Frontera、Antonio Caballero
DOI:10.1002/chem.201905786
日期:2020.4.9
The utilization of neutral receptors for the molecular recognition of anions based on chalcogen bonding (ChB) is an undeveloped area of host-guest chemistry. In this manuscript, the synthesis of two new families of sulfur, selenium, and tellurium-based ChB binding motifs are reported. The stability of the thiophene, selenophene, and tellurophene binding motifs has enabled the determination of the association
利用中性受体用于基于硫族元素键(ChB)的阴离子分子识别是宿主-客体化学领域中一个尚未开发的领域。在此手稿中,报告了两个新的硫,硒和碲基ChB结合基序家族的合成。噻吩,硒烯和碲烯结合基序的稳定性使得能够通过1 H,77 Se和125 Te NMR实验确定极性非质子溶剂THF中ChB卤化物阴离子结合的缔合常数。使用两个不同的芳族核,并结合一个或两个Ch结合基序,目的是封装阴离子,提供多达两个同时存在的硫属元素键。理论计算和NMR实验表明,对于S和Se受体,与硫族元素原子相邻的酸性H原子所涉及的氢键相互作用在能量上优于ChB相互作用。但是,对于碲醚结合基序,σ-孔相互作用是竞争性的,并且比氢键更受青睐。
Palladium-Catalyzed Suzuki Cross-Coupling of 2-Haloselenophenes: Synthesis of 2-Arylselenophenes, 2,5-Diarylselenophenes, and 2-Arylselenophenyl Ketones
作者:Patrícia Prediger、Angélica V. Moro、Cristina W. Nogueira、Lucielli Savegnago、Paulo Henrique Menezes、João B. T. Rocha、Gilson Zeni
DOI:10.1021/jo0601056
日期:2006.5.1
We present herein our results on the Suzuki coupling reaction of 2-haloselenophenes with boronic acids catalyzed by palladium salt and describe a new route established to prepare 2-arylselenophenes and 2,5-diarylselenophenes in good yields. The reaction proceeded cleanly under mild conditions and was performed with aryl boronic acids bearing electron-withdrawing, electron-donating, and neutral substituents
我们在本文中介绍2-卤代硒基与硼酸经钯盐催化的铃木偶联反应的结果,并描述了建立以高收率制备2-芳基硒烯和2,5-二芳基硒烯的新途径。该反应在温和的条件下干净地进行,并在DME中存在Pd(OAc)2,K 2 CO 3 / H 2 O的情况下,用带有吸电子,给电子和中性取代基的芳基硼酸进行。另外,通过该方案,还通过羰基化方法从2-碘硒基苯和硼酸获得不对称的芳基酮。