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Molecules 2008, 13(1), 195-203; doi:10.3390/molecules13010195

First Synthesis and Isolation of the E- and Z-Isomers of Some New Schiff Bases. Reactions of 6-Azido-5-Formyl-2-Pyridone with Aromatic Amines

Chemistry Department, Faculty of Science, EL-Minia University, El-Minia 61519, A. R. Egypt
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Author to whom correspondence should be addressed.
Received: 30 November 2006 / Accepted: 25 February 2007 / Published: 30 January 2008
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Abstract

Some novel Schiff bases have been prepared by reacting 6-azido-5-formyl-2-pyridone 1 with a series of aromatic amines 2a-f. 5-Arylaminomethylene-6-(E)-aryliminopyridones3a-e were obtained by reaction of 1 with 2a-e at room temperature,whereas with 2f, the 6-azido-5-naphthalen-2-yl-iminomethylpyridone derivative 4 wasformed. On the other hand, heating 1 with 2a-d at 140-150°C yielded two sets of isomericproducts, (E)-3a-d and (Z)-5a-d. Refluxing compounds (Z)-3a,c with hydroxyl-amine inmethanol gave the corresponding hydroxyliminopyridones 8a,c. Heating of (E)-3a-d withexcess POCl3 at reflux did not give the expected tricyclic compound 9, but rather theisomeric products (Z)-5a-d were obtained. The structures of all these products have beencharacterized using IR and 1H- and 13C-NMR spectroscopy.
Keywords: 6-Azido-5-formyl-2-pyridones; arylamines; Schiff bases; NMR spectroscopy. 6-Azido-5-formyl-2-pyridones; arylamines; Schiff bases; NMR spectroscopy.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Mekheimer, R.A.; Hameed, A.M.A.; Sadek, K.U. First Synthesis and Isolation of the E- and Z-Isomers of Some New Schiff Bases. Reactions of 6-Azido-5-Formyl-2-Pyridone with Aromatic Amines. Molecules 2008, 13, 195-203.

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