Copper-Catalyzed CNH<sub>2</sub>Arylation of 2-Aminobenzimidazoles and Related C-Amino-NH-azoles
作者:Desaboini Nageswar Rao、Sk. Rasheed、Karampoori Anil Kumar、Annem Siva Reddy、Parthasarathi Das
DOI:10.1002/adsc.201600035
日期:2016.6.30
nucleophilic sites that are selectively arylated at the CNH2 position are obtained, providing an exceptional tool for rapid delivery of a diverse array of medicinally important CNH(aryl) derivatives of aminoazoles without any protection/deprotection of ring NH bonds. It is first example for the selective CNH2 arylation of 5‐aminoindazole, 4‐aminopyrazole, 5‐aminopyrazole, 9H‐purine‐6‐amine, and 1H‐pyrazolo[3
Nickel-catalyzed Chan–Lam cross-coupling: chemoselective N-arylation of 2-aminobenzimidazoles
作者:K. Anil Kumar、Prakash Kannaboina、D. Nageswar Rao、Parthasarathi Das
DOI:10.1039/c6ob01307d
日期:——
A complementary set of Ni- and Cu-based catalyst systems for the selective N-arylation of 2-aminobenzimidazoles have been developed. Selective N-arylation of the primary amine (C-NH2) group was achieved by Ni-catalyzed, boronic acid promoted cross-coupling reactions in air, whereas, selective N-arylation of the azole nitrogen was achieved with Cu-catalysis and aryl halides. These protocols are general