In acetic acid, Friedel-Crafts alkylation of indoles by tert-enamides proceeded effectively in the absence of any catalyst to afford the pharmacologically and biologically active 2-oxo-1-pyrrolidine derivatives in moderate to good yields. The mechanistic study based on the NMR and HRMS analysis shows that the reaction was promoted by acid catalysis. The hydrogen-bond interaction between tert-enamides and AcOH may also be responsible for the reaction.
在
乙酸中,Friedel-Crafts 烷基化反应能够在不使用任何催化剂的情况下,通过叔烯酰胺有效地进行
吲哚的烷基化,以中等至良好的产率获得具有药理学和
生物学活性的2-氧代-1-
吡咯烷衍
生物。基于核磁共振(NMR)和高分辨质谱(HRMS)的机理研究表明,反应受到酸催化的促进作用。叔烯酰胺与
乙酸之间的氢键相互作用也可能是反应的推动因素之一。