我们在这里报告苯并[的替代和可调不含金属的合成b ] chalcogenophenes经由通过提升的冰冷的2-官能chalcogenoalkynes亲电环化反应。该新方法的特点是使用温和的反应条件,效率和通用性,适用于将不同的二硒化物和2-官能化硫属炔烃转化为总共22种2,3,3-双-有机och基-苯并[ b ]硫属oph烯,其中十八个是第一次合成。在Pd催化的与苯乙炔的反应中,将新型化合物2-(丁基硒基)-3-(苯基硒基)苯并呋喃用作底物,以高收率获得Sonogashira的偶联衍生物。
我们在这里报告苯并[的替代和可调不含金属的合成b ] chalcogenophenes经由通过提升的冰冷的2-官能chalcogenoalkynes亲电环化反应。该新方法的特点是使用温和的反应条件,效率和通用性,适用于将不同的二硒化物和2-官能化硫属炔烃转化为总共22种2,3,3-双-有机och基-苯并[ b ]硫属oph烯,其中十八个是第一次合成。在Pd催化的与苯乙炔的反应中,将新型化合物2-(丁基硒基)-3-(苯基硒基)苯并呋喃用作底物,以高收率获得Sonogashira的偶联衍生物。
Electrophilic Cyclization of 2-Chalcogenealkynylanisoles: Versatile Access to 2-Chalcogen-benzo[<i>b</i>]furans
作者:Flávia Manarin、Juliano A. Roehrs、Rafaela Mozzaquatro Gay、Ricardo Brandão、Paulo H. Menezes、Cristina W. Nogueira、Gilson Zeni
DOI:10.1021/jo802736e
日期:2009.3.6
An efficient synthesis of 2-chalcogen-3-substituted-benzo[b]furan compounds has been accomplished via electrophilic cyclization reaction of 2-chalcogenealkynyl anisoles using I-2, ICl, Br-2 and PhSeBr as electrophile sources. The product distributions were strongly dependent on the nature of substituents in the aromatic ring of anisole and on the chalcogen atom directly bonded to the triple bond. The 2-chalcogen-3-iodo-benzo[b]furans obtained smoothly underwent conversion to more complex structures of benzo[b]furan derivatives via palladium- or copper-catalyzed cross-coupling reaction with thiols, diphenyl diselenides, and zincates.
Synthesis of 2,3-bis-organochalcogenyl-benzo[<i>b</i>]chalcogenophenes promoted by Oxone®
作者:Gelson Perin、Liane K. Soares、Paola S. Hellwig、Marcio S. Silva、José S. S. Neto、Juliano A. Roehrs、Thiago Barcellos、Eder J. Lenardão
DOI:10.1039/c9nj00526a
日期:——
We report here an alternative and tunable metal-free synthesis of benzo[b]chalcogenophenes via the electrophilic cyclization of 2-functionalized chalcogenoalkynes promoted by Oxone®. The use of mild reaction conditions, efficiency and generality are characteristics of this new approach, which was suitable to convert different diselenides and 2-functionalized chalcogenoalkynes into a total of twenty-two
我们在这里报告苯并[的替代和可调不含金属的合成b ] chalcogenophenes经由通过提升的冰冷的2-官能chalcogenoalkynes亲电环化反应。该新方法的特点是使用温和的反应条件,效率和通用性,适用于将不同的二硒化物和2-官能化硫属炔烃转化为总共22种2,3,3-双-有机och基-苯并[ b ]硫属oph烯,其中十八个是第一次合成。在Pd催化的与苯乙炔的反应中,将新型化合物2-(丁基硒基)-3-(苯基硒基)苯并呋喃用作底物,以高收率获得Sonogashira的偶联衍生物。