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 selectiveN-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。
2,4-Diaminopyrimidines as Antimalarials. III. 5-Aryl Derivatives
作者:Peter B. Russell、George H. Hitchings
DOI:10.1021/ja01152a060
日期:1951.8
Catalytic α-Monoallylation of Aryl Acetonitriles
作者:Tapan Maji、Jon A. Tunge
DOI:10.1021/ol5024294
日期:2014.10.3
alpha-Cyano aldehydes undergo selective transition-metal-catalyzed monoallylation to provide alpha-allylated nitriles. The transformation leads to linear substitution products with palladium catalysts or branched allylated nitriles using an iridium catalyst. Facile TBD-catalyzed retro-Claisen cleavage is leveraged to attain selective monoallylation.