Halogenation of pyridinium-N-(2′-pyridyl)aminide: An easy synthesis of halo-2-aminopyridines
摘要:
The regioselective halogenation of pyridinium-N-(2'-pyridyl)aminide 1 with N-chloro, bromo or iodosuccinimide under mild conditions is described. The method, combined with a reduction of the N-N bond, allows an easy preparation of 5-halo and 3,5-dihalo-2-aminopyridines 4.
Azinium-N-(2′-azinyl)aminides: synthesis, structure and reactivity
作者:Rosa Carceller、Jose L. García-Navío、María L. Izquierdo、Julio Alvarez-Builla、Mariano Fajardo、Pilar Gómez-Sal、Federico Gago
DOI:10.1016/s0040-4020(01)90411-9
日期:1994.4
Several azinium-N-(2′-azinyl)aminides are reported. The structure of pyridinium-N-(2′-pyridyl)aminide has been studied, both in solution and in crystalline state, and results have been compared. In non-polar solvents, the aminides present a planar conformation stabilized by an intramolecular hydrogen bond. The reactivity toward electrophiles confirms the structural data, producing either N- or C- substitutions
N-Azinylpyridinium N-Aminides: An Approach to Pyrazolopyridines via an Intramolecular Radical Pathway
作者:Araceli Nuñez、Aránzazu García de Viedma、Valentín Martínez-Barrasa、Carolina Burgos、Julio Alvarez-Builla
DOI:10.1055/s-2002-32596
日期:——
has been devoted to pyridyl radicals; both Snieckus 3 and Nadin 4 have reported pyridyl radicalcyclisations. Harrowven 5 has published some papers, which include pyridyl radicalcyclisations and aryl radicalcyclisations onto pyridines. Jones 6 has disclosed the use of radicalsderived from 3-bromopyridine and the exten- sion of this chemistry to pyridinium radicals. 7 However, to the best of our
Pyridinium-N-(2-pyridyl)aminides: A selective approach to substituted 2-aminopyridines
作者:Rosa Carceller、Jose L. García-Navío、María L. Izquierdo、Julio Alvarez-Builla
DOI:10.1016/s0040-4039(00)91991-9
日期:1993.3
Differently substituted 2-aminopyridines have been prepared in two steps from pyridinium-N-(2-pyridyl)aminide, by reaction with the corresponding elect
分两步从吡啶鎓-N-(2-吡啶基)氨基化物制备二取代的2-氨基吡啶,方法是与相应的
Pyridinium N-heteroarylaminides: a brief study on the synthesis and reactivity under solvent-free mechanochem conditions
作者:Carolina Burgos、Marta Cordoba、Valentina Abet、Maria Moron、Rafael R. Castillo、M. Luisa Izquierdo
DOI:10.3998/ark.5550190.0012.312
日期:——
The first example of a heterocyclic aromatic substitution by an N-ylide and the first examples of heteroaromatic halogenations in the presence of N-halosuccinimides using mechanochemical conditions are described.
Pyridinium N-(2′-Azinyl)Aminides: Regioselective Synthesis of 2-Alkylaminoazines
作者:Valentı́n Martı́nez-Barrasa、Francisca Delgado、Carolina Burgos、J. Luis Garcı́a-Navı́o、M. Luisa Izquierdo、Julio Alvarez-Builla
DOI:10.1016/s0040-4020(00)00084-3
日期:2000.4
The regioselective alkylation of pyridinium-N-(2'-azinil)aminides with alkyl halides under mild conditions is described. The alkylation, combined with a reduction of the N-N bond, allows an easy preparation of 2-alkylaminoazines. (C) 2000 Elsevier Science Ltd. AU rights reserved.