SnCl2·2H2O-Catalyzed Solvent-Free Synthesis of α-Amino Ketones and Tetrasubstituted Pyrazines
作者:Fatemeh Tamaddon、Arefeh Dehghani Tafti
DOI:10.1055/s-0035-1561663
日期:——
α-amino ketones in excellent yields. While a similar reaction with aliphatic amines is applicable for the synthesis of substituted pyrazines, SnCl 2 ·2H 2 O permits versatility in the solvent-free reaction of α-hydroxy ketones with ammonium acetate to give the corresponding substituted pyrazines in good to excellent yields.
各种苯胺与α-羟基酮在SnCl 2 ·2H 2 O 催化下的无溶剂反应以优异的产率提供了α-氨基酮。虽然与脂肪胺的类似反应适用于合成取代的吡嗪,但 SnCl 2 ·2H 2 O 在 α-羟基酮与乙酸铵的无溶剂反应中具有多功能性,以良好到极好的产率得到相应的取代吡嗪。
Phosphine Supported Ruthenium Nanoparticle Catalyzed Synthesis of Substituted Pyrazines and Imidazoles from α-Diketones
作者:Prasad Ganji、Piet W. N. M. van Leeuwen
DOI:10.1021/acs.joc.6b03032
日期:2017.2.3
pyrazines and imidazoles starting fromα-diketones using phosphine supported ruthenium nanoparticles (RuNPs) as catalysts. Ruthenium nanoparticles Ru1–Ru4 supported with different phosphines such as dbdocphos, dppp, DPEphos, and Xantphos are screened, of which Ru1 and Ru4 are found to be the most active. Interestingly, aryl-substituted and alkyl-substituted α-diketones produced different products: namely
Synthesis of tetraaryl- and tetraalkenylpyrazines by Suzuki–Miyaura reactions of tetrachloropyrazine
作者:Andranik Petrosyan、Peter Ehlers、Sebastian Reimann、Tariel V. Ghochikyan、Ashot S. Saghyan、Anke Spannenberg、Stefan Lochbrunner、Peter Langer
DOI:10.1016/j.tet.2015.07.028
日期:2015.9
The first Suzuki Miyaura reactions of tetrachloropyrazine allowed for a new and convenient approach to synthesize a variety of tetraarylpyrazines and tetraalkenylpyrazines, which were isolated in good to excellent yields. The products show strong fluorescence with good quantum yields. The emission wavelength depends on the substitution pattern, which suggests an electronic interaction of the aryl groups with the pyrazine moiety. (C) 2015 Elsevier Ltd. All rights reserved.