A chemoselective Ugi-type reaction in water using TMSCN as a functional isonitrile equivalent: generation of heteroaromatic molecular diversity
作者:Sankar Kumar Guchhait、Vikas Chaudhary、Chetna Madaan
DOI:10.1039/c2ob26733k
日期:——
KF-mediated nucleophilic activation of TMSCN as a functional isonitrile equivalent establishes an efficient and chemoselective Ugi-type multicomponent reaction of a heterocyclic amidine and aldehyde with TMSCN in water. In this approach, the use of isocyanide is circumvented, known competing reactions are virtually eliminated, pure products are obtained by a non-chromatographic method, and therapeutically relevant and diverse N-fused 3-aminoimidazoles can be prepared from a wide variety of aldehydes and heterocyclic amidines. This reaction coupling with cascade cyclization provides various privileged tetracyclic heteroaromatic scaffolds.
KF催化的TMSCN亲核活化作为功能性异腈等价物,建立了羟基胺和醛与TMSCN在水中进行的高效且化学选择性的Ugi类型多组分反应。在这种方法中,避免了异氰酸酯的使用,已知的竞争反应几乎被消除,纯产品通过非色谱法获得,并且可从多种醛和杂环胺制备出具有治疗相关性和多样性的N-融合3-氨基咪唑。该反应结合级联环化提供了多种特权的四环杂芳烃骨架。