Assembly of substituted 3-aminoindazoles from 2-bromobenzonitrile via a CuBr-catalyzed coupling/condensation cascade
Lanting Xu1, Yinsheng Peng, Qiangbiao Pan
1Department of Chemistry, Fudan University, Shanghai 200433, China.
Abstract:
CuBr-catalyzed coupling reaction of 2-halobenzonitriles with hydrazine carboxylic esters and CuBr/4-hydroxy-l-proline-catalyzed coupling reaction of 2-bromobenzonitriles with N'-arylbenzohydrazides proceed smoothly at 60-90 °C to provide substituted 3-aminoindazoles through a cascade coupling/condensation (or coupling/deacylation/condensation) process. A wide range of 3-aminoindazoles with substituents at both the 1-position and the phenyl ring part can be prepared from the corresponding coupling partners.
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