一种环境友好且操作简单的一锅法,用于在水中使用 AgI 作为催化剂从邻炔醛和芳胺中区域选择性串联合成多种取代的稠合苯并咪唑并 [2,1-a] 异喹啉、萘啶、噻吩并吡啶和喹喔啉被描述。该反应显示在更具亲电性的炔基碳上形成了选择性的 N-C 键,从而产生了区域选择性的 6-endo-dig 环化产物,产率很好。所提出的合成稠合杂环的机理途径是在环 B 之前形成环 A,环 B 是通过氮对炔基碳的第二次分子内攻击形成的,得到了分离的中间体 U 和环化产物 5a 的机械实验和 X 射线晶体学研究的支持。对比实验表明,分子内亲核攻击的可行性高于外部亲核试剂的分子间攻击。这种催化的绿色方案已有效地应用于水中的双串联环化。
Facile Assembly of Fused Isoquinolines by Gold(I)-Catalyzed Coupling-Cyclization Reactions between o-Alkynylbenzaldehydes and Aromatic Amines Containing Tethered Nucleophiles
作者:Nitin T. Patil、Anil Kumar Mutyala、Pediredla G. V. V. Lakshmi、Penmatcha V. K. Raju、Balasubramanian Sridhar
DOI:10.1002/ejoc.200901364
日期:2010.4
A gold(I)-catalyzed, operationally simple coupling-cyclization technique was developed for the synthesis of isoquinoline-fused polycyclic compounds. The reaction makes use of two coupling partners such as o-alkynylbenzaldehydes and aromaticamines having tetherednucleophiles. The reaction is easy to perform, broad in scope, and allows the generation of a number of biologically important heterocyclic