Pentafluoropyridine was used as the starting material for the preparation of a range of pyridine derivatives that bear five different substituents. In this context, syntheses of penta-functional pyridine systems by sequences of nucleophilic aromatic substitution, palladium catalysed coupling and bromo-lithiation processes are described. (C) 2001 Elsevier Science BN. All rights reserved.
[EN] IMIDAZO-PYRIDINE DERIVATIVES AS LIGANDS FOR GABA RECEPTORS<br/>[FR] DERIVES D'IMIDAZO-PYRIDINE UTILISES EN TANT QUE LIGANDS POUR LES RECEPTEURS GABA
申请人:MERCK SHARP & DOHME
公开号:WO2003099816A1
公开(公告)日:2003-12-04
A class of 8-fluoro-3-phenylimidazo[1,2-a]pyridine derivatives, substituted at the meta position of the phenyl ring by an optionally substituted aryl or heteroaryl group, or by a pyrrolidinonyl group, which is directly attached or bridged by an oxygen atom or by a -NH- or -OCH2- linkage, being selective ligands for GABAA receptors, in particular having high affinity for the α2 and/or α3 and/or α5 subunit thereof, are accordingly of benefit in the treatment and/or prevention of adverse conditions of the central nervous system, including anxiety, convulsions and cognitive disorders.
作者:Hadjar Benmansour、Richard D. Chambers、Graham Sandford、Andrei S. Batsanov、Judith A.K. Howard
DOI:10.1016/j.jfluchem.2007.02.012
日期:2007.7
Palladium catalysed Suzuki cross-coupling reactions between 2,4,6-tribromo-3,5-difluoropyridine and a short series of aromatic boronic acid derivatives gave 4-bromo-3,5-difluoro-2,6-diphenylpyridine derivatives arising from displacement of bromine atoms attached to positions ortho to ring nitrogen or the corresponding triaryl systems depending on the reaction conditions. Consequently, the use of p
Polyfluoroheterocyclic compounds. Part XVIII. Reactions of heptafluoro-quinoline and -isoquinoline and pentafluoropyridine with hydrogen halides
作者:R. D. Chambers、M. Hole、W. K. R. Musgrave、J. G. Thorpe
DOI:10.1039/j39710000061
日期:——
When pentafluoropyridine and heptafluoro-quinoline and -isoquinoline react with hydrogen halides in tetrahydro-thiophen dioxide, replacement of fluorine ortho and para to ring nitrogen by the other halogen occurs. The order of reactivity is heptafluoroquinoline ⋙ heptafluoroisoquinoline > pentafluoropyridine. Reaction with heptafluoro-quinoline occurs at room temperature with substitution first at
作者:Hadjar Benmansour、Richard D Chambers、Graham Sandford、Graham McGowan、Slimane Dahaoui、Dmitrii S Yufit、Judith A.K Howard
DOI:10.1016/s0022-1139(01)00534-6
日期:2001.12
5-difluoro-pyridine 1 was used as the starting material for the synthesis of a variety of multifunctional pyridine derivatives. For example, nucleophilic substitution reactions involving appropriate difunctional nucleophiles gave products resulting from intramolecular cyclisation processes and the organolithium derivative 9, readily prepared from 1, could be trapped by various of electrophilicreagents.
Imidazo-pyrimidine derivatives as ligands for gaba receptors
申请人:——
公开号:US20020193385A1
公开(公告)日:2002-12-19
A class of 3-phenylimidazo[1,2-&agr;]pyrimidine derivatives, substituted at the meta position of the phenyl ring by an optionally substituted aryl or heteroaryl group which is directly attached or bridged by an oxygen atom or a —NH— linkage, and further substituted on the phenyl ring by alkyl, trifluoromethyl, alkoxy or one or two halogen atoms, especially fluoro, are selective ligands for GABA
A
receptors, in particular having good affinity for the &agr;2 and/or &agr;3 and/or &agr;5 subunit thereof, and are accordingly of benefit in the treatment and/or prevention of adverse conditions of the central nervous system, including anxiety, convulsions and cognitive disorders.