Divergent strategy for the chemoselective synthesis of N-Arylbenzimidazoles and N-Arylindazoles from arylamino oximes
摘要:
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.
DAST-promoted Beckmann rearrangement/intramolecular cyclization of acyclic ketoximes: access to 2-oxazolines, benzimidazoles and benzoxazoles
作者:Huiqin Li、Jian Qin、Zonglian Yang、Xiaoxue Guan、Lin Zhang、Peiqiu Liao、Xingqi Li
DOI:10.1039/c5cc02155c
日期:——
The first example of DAST-promoted Beckmann rearrangement/intramolecular cyclization of acyclic ketoximes is described, which affords 2-oxazolines, benzimidazoles and benzoxazoles.
Synthesis of 1,2-disubstituted benzimidazoles using an aza-Wittig-equivalent process
作者:Yuan Chen、Fanghui Xu、Zhihua Sun
DOI:10.1039/c7ra09010b
日期:——
A synthetic approach for 1,2-disubstituted benzimidazoles has been successfully designed based on effective C–N bond construction, which demonstrated mild reaction conditions and excellent yields. The method involves treating derivatives of o-phenylenediamine with tert-butanesulfoxide and NBS under acidic conditions, which undergoes an aza-Wittig-equivalent process to afford the desired products. Using
[EN] 1,3,5-TRIAZINE COMPOUND AND COMPOSITION, AND APPLICATION THEREOF<br/>[FR] COMPOSÉ DE 1,3,5-TRIAZINE, COMPOSITION ET UTILISATION ASSOCIÉES<br/>[ZH] 一种1,3,5-三嗪类化合物、组合物及其应用
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