Copper-catalysed <i>N</i>-arylation of 5-aminopyrazoles: a simple route to pyrazolo[3,4-<i>b</i>]indoles
作者:Arpita Chatterjee、Chudamani Murmu、S. Peruncheralathan
DOI:10.1039/d0ob00812e
日期:——
A copper-catalysed intramolecular N-arylation of 5-aminopyrazoles is demonstrated for the first time. Highly substituted pyrazolo[3,4-b]indoles are synthesized. In particular, the indole core is decorated with halogens and alkyl and methoxy groups. Furthermore, a selective N-arylation of unsymmetrical diaryl bromide containing pyrazoles is exemplified, resulting in valuable pyrazolo[1,5-a]benzimidazoles
首次证明了铜催化的5-氨基吡唑的分子内N-芳基化。合成了高度取代的吡唑并[3,4- b ]吲哚。特别地,吲哚核被卤素以及烷基和甲氧基装饰。此外,举例说明了含不对称二芳基溴的吡唑的选择性N-芳基化,得到了有价值的吡唑并[1,5- a ]苯并咪唑。