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A versatile new approach for the synthesis in three steps of 2-substituted-2,3-dihydro[1,4]dioxino[2,3-b]pyridines B via a Smiles rearrangement using easily available reagents is described. A study illustrating the influence of experimental conditions on the progress of the reaction is reported. 相似文献
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The synthesis of new 4,6-disubstituted dihydrodipyridopyrazines starting from corresponding carboxaldehydes via lithiation directed by alpha-amino alkoxides is described. The N,N,N'-trimethylethylenediamine was used as amine component for in situ formation of the alpha-amino alkoxides. After optimization, this reaction allowed easy access to new interesting starting materials for further applications by palladium-catalyzed reactions. 相似文献
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Irina-Claudia Grig-Alexa Adriana-Luminita Finaru Lucia Ivan Paul Caubère 《Tetrahedron letters》2004,45(11):2343-2346
Various 4-substituted dihydrodipyridopyrazines were synthesized by palladium-mediated cross-coupling reactions. Starting from the corresponding 4-iodo or 4-bromo derivatives, the incorporation of aryl, vinyl, alkynyl and methoxycarbonyl groups is described. 相似文献
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Irina-Claudia Grig-Alexa Iuliana Simionescu Oana-Irina Patriciu Stéphane Massip Adriana-Luminita Fînaru Christian Jarry Jean-Michel Léger Gérald Guillaumet 《Tetrahedron letters》2012,53(15):1885-1888
The formation of alkoxy substituted di(pyridin-2-yl)amines and N-arylpyridin-2-ylamines by nitro group reduction is described. Unexpected substitution of ortho with the amino at C-6 was observed during the reduction using SnCl2·2H2O in different alcohols. The influence of the nature of the atom at the 3- and 5-positions of nitro-substituted di(pyridin-2-yl)amines and N-arylpyridin-2-ylamines was investigated. 相似文献
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The authors present data concerning the evaluation of kinetic parameters of the decomposition of a Mannich compound by using
the classical method of constant heating rate thermal analysis and the new one of controlled rate thermal analysis (CRTA).
The data processed using the CRTA method allow to obtain more reliable kinetic parameters according to the proposed reaction
mechanism.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Raluca-Ioana Chirita Caroline West Adriana-Luminita Finaru Claire Elfakir 《Journal of chromatography. A》2010,1217(18):3091-3104
This paper presents the comparison between 12 hydrophilic interaction liquid chromatography columns that are commercially available. The main factors influencing the retention and selectivity toward 12 neurotransmitters for these different HILIC systems have been studied. For additional information, the retention data have been analyzed statistically by factor analysis. Principal component analyses (PCA) were calculated to evidence different separation behaviour between the stationary phases, based on the retention data measured for three compound classes: anionic acidic compounds, cationic basic compounds and zwitterionic amino acids. Finally, a generic procedure is suggested for optimization of HILIC analyses, depending on the ionization state of the analytes. 相似文献
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