Synthesis of N-Arylindazoles and Benzimidazoles from a Common Intermediate
摘要:
A variety of N-aryl-1H-indazoles and benzimidazoles were synthesized from common arylamino oximes in good to excellent yields The product selectivity depends upon the base used in the reaction, as triethylamine promoted the formation of benzimidazoles, whereas 2-aminopyridine promoted the formation of N-arylindazoles This method is valuable to the synthetic community because both indazoles and benzimidazoles are prevalent in pharmaceuticals
Divergent strategy for the chemoselective synthesis of N-Arylbenzimidazoles and N-Arylindazoles from arylamino oximes
作者:Zhen-Hua Li、Xiao-Meng Sun、Jin-Jing Qin、Zhi-Yong Tan、Wen-Biao Wang、Yao Ma
DOI:10.1016/j.tet.2020.130945
日期:2020.2
An efficient and divergent synthesis of N-arylbenzimidazoles and N-arylindazoles from arylamino oximes based on reaction conditions selection was developed. The synthesis was approached by treating oximes with BTC and the chemoselectivity was regulated by the amount of Et3N. This switchable N-N and N-C bond formation process features mild reaction conditions, simple execution, high chemoselectivity and broad substrate scope. (C) 2020 Elsevier Ltd. All rights reserved.
HELLWINKEL D.; ITTEMANN P., CHEM. BER., 119,(1986) N 10, 3165-3197
作者:HELLWINKEL D.、 ITTEMANN P.
DOI:——
日期:——
Synthesis of <i>N</i>-Arylindazoles and Benzimidazoles from a Common Intermediate
作者:Brenda C. Wray、James P. Stambuli
DOI:10.1021/ol101899q
日期:2010.10.15
A variety of N-aryl-1H-indazoles and benzimidazoles were synthesized from common arylamino oximes in good to excellent yields The product selectivity depends upon the base used in the reaction, as triethylamine promoted the formation of benzimidazoles, whereas 2-aminopyridine promoted the formation of N-arylindazoles This method is valuable to the synthetic community because both indazoles and benzimidazoles are prevalent in pharmaceuticals
Copper-Catalyzed Aerobic Oxidative CH and CC Functionalization of 1-[2-(Arylamino)aryl]ethanones Leading to Acridone Derivatives
作者:Jipan Yu、Haijun Yang、Yuyang Jiang、Hua Fu
DOI:10.1002/chem.201204169
日期:2013.3.25
Efficient copper‐catalyzedaerobicoxidative CH and CC functionalization of 1‐[2‐(arylamino)aryl]ethanones leading to acridones has been developed. The procedure involves cleavage of aromatic CH and acetyl CC bonds with intramolecular formation of a diarylketone bond. The protocol uses inexpensive Cu(O2CCF3)2 as catalyst, pyridine as additive, and economical and environmentally friendly oxygen