Electrochemistry of Aminoazines and Nitrones: Electrochemical Reductions of 2-Amino-1,4-pyrazine with Nitrones to Form Amide Compounds and Electrochemical Oxidations of Anilines with Nitrones to Form Imine Compounds and Benzaldehydes
Electrochemical reductions of 2-amino-1,4-pyrazine in the presence of nitrone derivatives afforded two types of amide compounds, one of which was derived from both the pyrazine and the nitrones and the other from only the nitrones. The analogous reactions but using 2-aminopyridine or aniline instead of the pyrazine resulted in the recovery of the starting materials. On the other hand, electrochemical oxidations of the aminoazine derivatives in the presence of nitrones did not afford any isolatable products. However the reaction using aniline derivatives formed imine compounds accompanied by benzaldehyde derivatives.
Synthesis and fluorescence properties of difluoro[amidopyrazinato-O,N]boron derivatives: a new boron-containing fluorophore
New boron-containing fluorophores, difluoro[amidopyrazinato-O,N]boron (APB) derivatives, were prepared from amidopyrazines. The fluorescence properties of APB were successfully modulated by an aryl substitution at the C8 position. (C) 2010 Elsevier Ltd. All rights reserved.
Design, Synthesis and Evaluation of N-pyrazinylbenzamides as Potential Antimycobacterial Agents
Three series of N-(pyrazin-2-yl)benzamides were designed as retro-amide analogues of previously published N-phenylpyrazine-2-carboxamides with in vitro antimycobacterial activity. The synthesized retro-amides were evaluated for in vitro growth inhibiting activity against Mycobacterium tuberculosis H37Rv (Mtb), three non-tuberculous mycobacterial strains (M. avium, M. kansasii, M. smegmatis) and selected
thiazolo[4,5-b]pyrazine (TPy) derivatives with the phenyl group at the C2 position were studied. TPys were readily prepared from the corresponding amidopyrazines, which have a similar fluorescent core to a bioluminescence light emitter, Cypridina oxyluciferin. It was found that the introduction of electron-donating (methoxy and dimethylamino) groups onto the 2-phenyl moiety of the TPy derivatives, as well