1-Alkoxy-7-hydroxy-1,3-dihydrofuro[3,4-<Emphasis Type="Italic">c</Emphasis>]pyridinium Salts

New salt structures have been synthesized from pyridoxal and various organic and inorganic acids.     

An Experimental and Theoretical Study of Intramolecular Cyclization of Phosphorylated Thioureas

New 1,3,2-thiazaphospholines were prepared, and their steric and electronic structures were examined. The steric and electronic structure of N-[(O-methyl)chloromethylthiophosphoryl]thiourea and the pathways of their intramolecular cyclization and rearrangement were studied by ab initio and semiempirical methods. The influence exerted by the conformational factors in thiourea and in the anion formed from it under the conditions of base catalysis on the direction of the reactions involving these species was revealed, and the structure of intermediate complexes and the final products was determined.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 3, 2005, pp. 395–405.Original Russian Text Copyright © 2005 by Zverev, Chmutova, M. Pudovik, Khailova, Bagautdinova, Azancheev, Litvinov, Kataeva, A. Pudovik.     

Synthesis of 4-Phenoxytetrahydro-1,3,4λ5-thiazaphosphol-2-one 4-Sulfide

Russian Journal of General Chemistry -     

Unsymmetrical Pyridoxal-Based Bisazomethines

Russian Journal of General Chemistry - The reaction of equimolar amounts of pyridoxal and 1,2-propylenediamine leads to the formation of monoimine, which exists as a cyclic imidazolidine tautomer....     

Pyridoxal Azomethine Salts

Russian Journal of General Chemistry - The reactions of 4-methylpiperazin-1-amine, 2-amino- and 4-aminomethylpiperidines with pyridoxal afforded the corresponding azomethines. Their reactions with...     

Synthesis and Structure of 1,3,4-Oxaza(thiaza)phospholines

Bis(chloromethyl)phosphinic (-phosphinothioic) iso(thio)cyanates add secondary amines to form N-phosphorylated (thio)ureas, which cyclize in the presence of a base to 1,3,4⁵-oxaza(thiaza)phospholines. Phosphorylated ureas obtained by addition of ammonia and primary amines to chloromethylphosphonic (-phosphinic) isocyanates cyclize to give 1,4,2-diazaphospholidines or 1,3,4-oxazaphospholines. Prototropic transformations in the series of 1,3,4⁵-oxazaphospholines were revealed; the electronic and steric structures of the tautomers were studied. Chloromethylphosphonothioic (-phosphinothioic) isothiocyanates add primary amines to give 1,3,4⁵-thiazaphospholines.     

Reactions of pyridoxal with aromatic carboxylic acids in alcoholic medium

Russian Journal of General Chemistry - Reactions of pyridoxal with benzoic acid and its derivatives in alcoholic medium afforded alkoxyfuropyridinium salts with potential biological activity.