Synthesis of 5H-Pyrazino[2,3-b]indoles from Indole-2,3-dione Derivatives.
摘要:
Reaction of N-acetylindol-2,3-diones with ethylenediamines gave the dihydro-pyrazinones 11, which could, after dehydrogenation and deacetylation be transformed to the corresponding 5H-pyrazino[2,3-b]indoles 5. N,N-Dimethylaminoethylation of the anion of 5 occurred selectively in the 5-position. Thermolysis of 1-pyrazinylbenzotriazole gave pyrazino[1,2-a]-benzimidazole 33 and no 5H-pyrazino[2,3-b] indole.
TRICYCLIC N-HETEROARYL-CARBOXAMIDE DERIVATIVES CONTAINING A BENZIMIDAZOLE UNIT, METHOD FOR PREPARING SAME AND THEIR THERAPEUTIC USE
申请人:DUBOIS Laurent
公开号:US20090042873A1
公开(公告)日:2009-02-12
The invention concerns tricyclic N-heteroarylcarboxamide derivatives containing a benzimidazole unit of general formula (I):
Wherein A, P, Y, R
1
, R
2
and R
3
are as defined herein. The invention also concerns a method of preparing the compounds and their therapeutic use.
Regiospecific Synthesis of 1,2-Disubstituted (Hetero)aryl Fused Imidazoles with Tunable Fluorescent Emission
作者:Dongbing Zhao、Junyi Hu、Ningjie Wu、Xiaolei Huang、Xurong Qin、Jingbo Lan、Jingsong You
DOI:10.1021/ol202807d
日期:2011.12.16
A palladium-catalyzed two or fourfold amination was established that allows regiospecific synthesis of a diversity-oriented library of 1,2-disubstituted (hetero)aryl fused imidazoles, and provides an exceptional tool for the discovery of fluorescent scaffolds with tunable fluorescence emission. These fluorophores have been applied as fluorescent probes for live cell imaging.
Synthesis of pyrido[1,2-a]benzimidazoles by photo-stimulated C–N bond formation via SRN1 reactions
作者:Silvia M. Barolo、You Wang、Roberto A. Rossi、Gregory D. Cuny
DOI:10.1016/j.tet.2013.04.087
日期:2013.7
The photo-stimulated cyclization of 2-(2-halophenylamino)pyridines in liquid ammonia afforded pyrido [1,2-a]benzimidazoles via S(RN)1 mediated C-N bond forming reactions in moderate to excellent yields (58-94%). This general synthetic strategy was also extended to a 2-(2-bromophenylamino)pyrazine to give pyrazino[1,2-a]benzimidazole. Attempts to employ this reaction using N-(2-chlorophenyl)-3-isoquinolinamine, however, resulted in C-C bond formation generating 7H-indolo[2,3-c]isoquinoline. (C) 2013 Elsevier Ltd. All rights reserved.