Palladium-Free Synthesis of Conjugated Enynes by Direct Olefination of Terminal Alkynes Using Vinyl Bromides
作者:Yunyun Liu、Jianguo Yang、Weiliang Bao
DOI:10.1002/ejoc.200900954
日期:2009.11
A series of conjugated enynes were successfully synthesized by the direct copper-catalyzed coupling reaction of vinyl bromides and alkynes. The reaction proceeds smoothly in DMF at 110 °C to give the corresponding products in good to excellent yields. The protocol is tolerant to a broad range of functional groups on the substrates. Moreover, the products were furnished as specific E isomers, as the
通过乙烯基溴和炔烃的直接铜催化偶联反应,成功合成了一系列共轭烯炔。该反应在 DMF 中在 110 °C 下顺利进行,以良好到极好的收率得到相应的产物。该协议可以容忍基板上的各种功能组。此外,产品以特定的 E 异构体形式提供,因为乙烯基溴的立体化学得以保留。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)