通过用二硒化物通过电氧化促进炔烃的分子内环化,开发了一种温和、实用、无金属和无氧化剂的方法,用于合成各种 C-3 硒化苯并[ b ]呋喃衍生物。在分别配备碳和铂板作为阳极和阴极的未分隔电池中,在恒定电流下以良好至优异的产率获得了范围广泛的硒取代的苯并[ b ]呋喃衍生物,具有高区域选择性。此外,收敛方法表现出良好的官能团耐受性,并且可以很容易地以良好的效率进行放大,从而从简单、容易获得的起始材料中快速获得各种硒化苯并[ b ]呋喃衍生物。
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
A convenient and efficient copper-catalyzed synthesis of unsymmetrical and symmetrical diaryl chalcogenides from arylboronic acids in ethanol at room temperature
作者:Amit Kumar、Sangit Kumar
DOI:10.1016/j.tet.2014.01.030
日期:2014.3
A simple and convenient approach for the synthesis of unsymmetrical diaryl chalcogenides (Te, Se, and S) has been developed by copper-catalyzed cross-coupling reaction of organoboronic acid with diaryl dichalcogenide in ethanol using NaBH4 in air or oxygen. The present methodology is highly practical for the synthesis of unsymmetrical diaryl tellurides with various functionalities such as -NO2, -F, -Br, and -COOH that have been obtained in good to excellent yields. Methodology is also effective for the synthesis of unsymmetrical diaryl selenides and sulfides. Moreover, symmetrical diaryl selenides have also been obtained from arylboronic acids using elemental selenium powder under optimized reaction conditions. The use of NaBH4 is the key for the development of milder reaction conditions, which enable the construction of unsymmetrical diaryl chalcogenides from boronic acid substrates in ethanol at room temperature. (C) 2014 Elsevier Ltd. All rights reserved.
Ishii,Y. et al., Synthetic Communications, 1978, vol. 8, p. 93 - 97
作者:Ishii,Y. et al.
DOI:——
日期:——
Selenium dioxide promoted dinitrogen extrusion/direct selenation of arylhydrazines and anilines
作者:Mohammad Yaqoob Bhat、Atul Kumar、Qazi Naveed Ahmed
DOI:10.1016/j.tet.2020.131105
日期:2020.4
A novel, efficient, economical strategy for the coupling and direct selenation of arylhydrazines to selenides using SeO2 has been developed. Our method employs SeO2 as the selenium source with hydrazines as coupling reactants to generate selenides via dinitrogen extrusion. This reagent also helped to generate ArSesubstitued aniline derivatives via C– H functionalization reaction in good yields. The
A mild, practical, metal and oxidant-free methodology for the synthesis of various C-3 selenylated benzo[b]furan derivatives was developed through the intramolecular cyclization of alkynes promoted with diselenides via electrooxidation. A wide range of selenium-substituted benzo[b]furan derivatives were obtained in good to excellent yields with high regioselectivity under constant current in an undivided
通过用二硒化物通过电氧化促进炔烃的分子内环化,开发了一种温和、实用、无金属和无氧化剂的方法,用于合成各种 C-3 硒化苯并[ b ]呋喃衍生物。在分别配备碳和铂板作为阳极和阴极的未分隔电池中,在恒定电流下以良好至优异的产率获得了范围广泛的硒取代的苯并[ b ]呋喃衍生物,具有高区域选择性。此外,收敛方法表现出良好的官能团耐受性,并且可以很容易地以良好的效率进行放大,从而从简单、容易获得的起始材料中快速获得各种硒化苯并[ b ]呋喃衍生物。