An environmentally friendly and efficient synthesis of a series of 1,4-dihydropyridines was developed by the practical one-pot reactions of aldehydes with ammonium acetate and 1,3-dicarbonyl compounds such as alkyl acetoacetate, 5,5-dimethyl-1,3-cyclohexanedione, 1,3-cyclohexanedione, and 2,4-pentanedione in water without any additives under refluxing conditions.
Efficient iron catalyzed ligand-free access to acridines and acridinium ions
作者:Susanta Mandal、Karan Chhetri、Samuzal Bhuyan、Biswajit G. Roy
DOI:10.1039/d0gc00617c
日期:——
important classes of compounds in terms of their usefulness in pharmaceuticals, materials, dyes and photo-catalysis. Here we present an unconventional FeCl3-alcohol catalysed one-pot method for their synthesis directly from aldehydes, 1,3-cyclohexanedione and amines. This method efficiently merged high atom-economy and diversity of multicomponent reaction with novel iron catalyzed dehydrogenation, using
2,3-Cyclisch kondensierte 1,4-Dihydropyridine, Verfahren zu ihrer Herstellung und ihre Verwendung als selektive Kaliumkanalmodulatoren
申请人:BAYER AG
公开号:EP0705830A1
公开(公告)日:1996-04-10
Die vorliegende Erfindung betrifft neue 2,3-cyclisch kondensierte 1,4-Dihydropyridine der allgemeinen Formel (I),
in welcher R, R¹, R², D und E die in der Beschreibung angegebene Bedeutung haben, Verfahren zu ihrer Herstellung und ihre Verwendung als Arzneimittel, vorzugsweise zur Behandlung des zentralen Nervensystems.
本发明涉及通式(I)的新型 2,3-环缩合 1,4-二氢吡啶、
其中 R、R¹、R²、D 和 E 的含义,以及它们的制备工艺和作为药物(最好用于治疗中枢神经系统)的用途。
Carbon transfer reactions of functionalized oxazolidines and their open chain enamine tautomers to enamine nucleophiles. A facile synthesis of substituted pyridines and ring annulated derivatives
作者:Kamaljit Singh、Jasbir Singh、Harjit Singh
DOI:10.1016/s0040-4020(97)10349-0
日期:1998.1
Oxazolidines substituted at C-2 with -CH2-EW(-CO-, etc.) and capable of existing as ring-chain (enamine) tautomers' react with cyclic, acyclic and heterocyclic enamine derivatives in a 1:1 stoichiometric manner to provide a versatile synthesis of substituted pyridines and their ring annulated derivatives. (C) 1997 Elsevier Science Ltd. All rights reserved.
Shanmugasundaram; Ramakrishnan, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 1, p. 17 - 20