A facile synthesis of 3,5-halo and aryl 1H-pyridin-2-ones from pyridinium N-(pyridin-2-yl)aminide
摘要:
The synthesis of halogenated and arylated 1H-pyridin-2-ones starting from pyridinium N-(pyridin-2-yl)aminides is described. The synthetic pathway involves the reaction of pyridinium N-(5-bromopyridin-2-yl)aminide, N-(3-bromo-5-chloropyridin-2-yl)aminide or N-(3,5-dibromopyridin-2-yl)aminide with different boronic acids to afford monosubstituted and disubstituted aminides in good yields. An additional bromination in the 3-position of N-(5-arylpyridin-2-yl)aminides was performed. Finally, reduction of the N-N bond followed by the reaction of the corresponding 2-aminopyridines with sodium nitrite/sulfuric acid in water yields 3,5-disubstituted 1H-pyridin-2-ones in good yields. (C) 2013 Elsevier Ltd. All rights reserved.
A facile synthesis of 3,5-halo and aryl 1H-pyridin-2-ones from pyridinium N-(pyridin-2-yl)aminide
摘要:
The synthesis of halogenated and arylated 1H-pyridin-2-ones starting from pyridinium N-(pyridin-2-yl)aminides is described. The synthetic pathway involves the reaction of pyridinium N-(5-bromopyridin-2-yl)aminide, N-(3-bromo-5-chloropyridin-2-yl)aminide or N-(3,5-dibromopyridin-2-yl)aminide with different boronic acids to afford monosubstituted and disubstituted aminides in good yields. An additional bromination in the 3-position of N-(5-arylpyridin-2-yl)aminides was performed. Finally, reduction of the N-N bond followed by the reaction of the corresponding 2-aminopyridines with sodium nitrite/sulfuric acid in water yields 3,5-disubstituted 1H-pyridin-2-ones in good yields. (C) 2013 Elsevier Ltd. All rights reserved.
A New Class of Pyrazolopyridine Nucleus with Fluorescent Properties, Obtained through Either a Radical or a Pd Arylation Pathway from <i>N</i>-Azinylpyridinium <i>N</i>-Aminides
The synthesis of dipyridopyrazole and pyridopyrazolopyrazine derivatives--both of which incorporate a 3-aryl moiety--can be achieved in moderate yields by intramolecular radical arylation of pyridinium N-aminides using tris(trimethylsilyl)silane and azobisisobutyronitrile. Improved results were obtained on using Pd direct arylation in conjunction with microwave irradiation. A preliminary study into the fluorescent properties of the target compounds is also reported.
Regioselective Suzuki coupling on pyridinium N-(3,5-dibromoheteroar-2-yl)aminides
作者:M. José Reyes、Rafael Castillo、M. Luisa Izquierdo、Julio Alvarez-Builla
DOI:10.1016/j.tetlet.2006.06.097
日期:2006.9
A regioselective Suzuki-Miyaura cross-coupling reaction on 3',5'-dibromo pyridinium N-(2'-azinyl)aminides is reported. A series of 3'-aryl(or heteroaryl)-5-bromo-pyridinium N-(2'-pirazinyl)aminides were obtained in good yields. Two isomeric 3',5'-diaryl pyridinium N-(2-azinyl)aminides were also prepared. (c) 2006 Elsevier Ltd. All rights reserved.