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The discovery of bacteriostatic activity of Sulfidine was the stimulus for the study of the chemistry of isomeric aminopyridines with the objective of converting them into promising sulfamide preparations [2].Aminopyridines with nitrogroups on the pyridine nucleus have been insufficiently well studied, which is explained by their low accessibility. Exceptions are 2-amino-3-nitro-and 5-nitropyridines and their derivatives, which are accessible thanks to the activity of 2-aminopyridine to electrophilic substitution [3]. The number of publications connected with the preparation of substituted 3-amino-5-nitropyridines is limited to those describing the synthesis of 3-amino-5-nitropyridine [4-7], 3-amino-2-methyl-5-nitropyridine [8], and 3-amino-5-nitrocollidine [9].The objective of the present work was the synthesis of the previously unknown 3-amino-5-nitropyridines 2a,b, 4, 6b,c, and 9a-c based on the available nitropyridines 1a,b, 3a-c, and 7a-c which contain acetyl, amide, and carboxyl groups at position 3 of the pyridine nucleus, The choice of the variant of the sextet rearrangement in the synthesis of 3-amino-5-nitropyridines was determined by the availability of the corresponding 5-nitropyridines. 3-Amino-5-nitropyridines 2a,b were obtained by the Schmidt reaction starting from 3-acetyl-5-nitropyridines 1a,b by a one-stage synthesis which we had developed earlier [10,11]: N Ac O 2 N Me R N NH 2 R Me O 2 N 1. NaN 3 , H 2 SO 4 2. H 2 O,  1a,b 2a,b 1,2 a R = Me, b R = Ph

New Synthesis of 3-(2-Furyl)biphenyls. -The title compounds (II) are obtained by the rearrangement of the pyridinium salts (I) under alkaline conditions. -(SAGITULLINA*, G. P.; GLYZDINSKAYA, L. V.; SAGITULLIN, R. S.; Mendeleev

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The rearrangement of 3-benzoylamino-5-nitropyridinium quaternary salts by ethanolic methylamine results in the formation of 2-acyl-4-nitropyrroles.