Synthesis of Imidazo[1,2-a]pyridines: “Water-Mediated” Hydroamination and Silver-Catalyzed Aminooxygenation
摘要:
Aqueous syntheses of methylimidazo[1,2-a]pyridines without any deliberate addition of catalyst are reported. Imidazo[1,2-a]pyrazine and imidazo[2,1-a]isoquinoline were also obtained in good yields under similar conditions. With acetonitrile as solvent, Ag-catalyzed intra-molecular aminooxygenation produced imidazo[1,2-a]pyridine-3-carbaldehydes in moderate to good yields.
We report herein the silver-catalyzed cycloisomerization of readily available N-(prop-2-yn-1-yl)pyridine-2-amines as a new and practical method for the synthesis of differently substituted 3-methylimidazo[1,2-a]pyridines. The isomerization reactions proceeded under mild reactions conditions to give good yields and excellent regioselectivity. A DFT-based mechanistic analysis is also reported.
Water mediated deprotective intramolecular hydroamination of N-propargylaminopyridines: synthesis of imidazo[1,2-a]pyridines
作者:Darapaneni Chandra Mohan、Niraj B. Sarang、Subbarayappa Adimurthy
DOI:10.1016/j.tetlet.2013.08.112
日期:2013.11
Metal-free synthesis of substituted imidazole [1,2-alpha]dpyridines from deprotective N-(prop-2-yn-1-yl)pyridin-2-amines in water is elucidated. Electron releasing substituents on pyridine ring provided pure products in quantitative yields without separation by column chromatography. (C) 2013 Elsevier Ltd. All rights reserved.
A Base Promoted Cyclization of <i>N</i>-Propargylaminopyridines. Synthesis of Imidazo[1,2-<i>a</i>]pyridine Derivatives
A base promoted cyclization of the protected N-propargylaminopyridines was shown to be an efficient method for the preparation of imidazo[1,2-a] pyridine derivatives. The reactions were carried out with a small excess of base, at room temperature or slightly above producing the heterocyclic products in moderate to good yields. The stereoelectronic properties of substituents on the pyridine ring were shown to influence the cyclization process.
INHIBITORS OF HUMAN IMMUNODEFICIENCY VIRUS REPLICATION
申请人:BOEHRINGER INGELHEIM INTERNATIONAL GMBH
公开号:EP2429993B1
公开(公告)日:2015-01-21
[EN] MONOACYLGLYCEROL LIPASE MODULATORS<br/>[FR] MODULATEURS DE LA MONOACYLGLYCÉROL LIPASE
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2020065614A1
公开(公告)日:2020-04-02
Bridged compounds of Formula (I) and Formula (II), pharmaceutical compositions containing them, methods of making them, and methods of using them including methods for treating disease states, disorders, and conditions associated with MGL modulation, such as those associated with pain, psychiatric disorders, neurological disorders (including, but not limited to major depressive disorder, treatment resistant depression, anxious depression, bipolar disorder), cancers and eye conditions. and; wherein R2, R3 R4, R5 and R6 are defined herein.