A straight access to functionalized carbazoles by tandem reaction between indole and nitrobutadienes
作者:Lara Bianchi、Massimo Maccagno、Marcella Pani、Giovanni Petrillo、Carlo Scapolla、Cinzia Tavani
DOI:10.1016/j.tet.2015.05.046
日期:2015.9
substituted 1,3-butadienes produce poly-functionalized carbazoles through a double (inter-+intra-molecular) conjugate addition, followed by aromatization of the newly built ring. Significance is attached to the results obtained in fluorinated solvents such as trifluoroethanol, whereby a mild process, with no need for catalysis, overcomes some practical difficulties otherwise limiting the scope of the reaction
作为对从硝基噻吩的开环获得的硝基丁二烯结构单元的合成开发的研究的继续,我们在本文中报道了它们与π-亲核吲哚的反应。由于它们具有双迈克尔受体性质,因此,2,3-二硝基和2-硝基-3-苯基磺酰基取代的1,3-丁二烯可通过两次(分子间+分子内)共轭加成,然后进行芳构化来生产多官能化咔唑。新建的戒指。在氟化溶剂(如三氟乙醇)中获得的结果具有重要意义,因此,不需要催化的温和过程克服了一些实际困难,否则会限制反应范围。除了机械方面,反应还包含了一些合成兴趣的主题,