Base-assisted, copper-catalyzed N-arylation of (benz)imidazoles and amines with diarylborinic acids
作者:Changwei Guan、Yuanyuan Feng、Gang Zou、Jie Tang
DOI:10.1016/j.tet.2017.10.043
日期:2017.12
cost-effective aryl source has been efficiently effected via Cu(OAc)2-catalyzed Chan-Lam coupling in assistance of tetramethylethylenediamine (TMEDA) in methanol and pyridine (Py) in dichloromethane, respectively, in air at room temperature. The diarylborinic acids could be well accommodated by the Chan-Lam coupling oxidative conditions containing a proper combination of bases and solvents. The steric
developed an efficient method for the synthesis of benzimidazoles via cascade reactions of o-haloacetoanilide derivatives with amidine hydrochlorides. The protocol uses 10 mol % CuBr as the catalyst, Cs2CO3 as the base, and DMSO as the solvent, and no ligand is required. The procedure proceeds via the sequential coupling of o-haloacetoanilide derivatives with amidines, hydrolysis of the intermediates (amides)
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.
Metal-Free One-Pot Synthesis of<i>N</i>,<i>N′</i>-Diarylamidines and<i>N</i>-Arylbenzimidazoles from Arenediazonium Salts, Nitriles, and Free Anilines
作者:So Won Youn、Eun Mi Lee
DOI:10.1021/acs.orglett.6b02994
日期:2016.11.4
efficient and facile metal-free, one-pot reaction has been developed to afford diversely substituted N-arylbenzimidazoles through chemoselective in situ generation of N,N′-diarylamidines fromarenediazoniumsalts, nitriles, and free anilines. The advantages of this protocol consist of the operationally easy and simple one-pot procedure under metal-free and mild conditions, the direct use of inexpensive
AZACYCLYLBENZAMIDE DERIVATIVES AS HISTAMINE-3 ANTAGONISTS
申请人:Zhou Dahui
公开号:US20080293771A1
公开(公告)日:2008-11-27
The present invention provides a compound of formula I and the use thereof for the treatment of a central nervous system disorder related to or affected by the histamine-3 receptor