E. B. Nikolaenkova, A. Tikhonov, S.Yu. Grishchenko
Feb 1, 2019
Citations
0
Influential Citations
4
Citations
Journal
Chemistry of Heterocyclic Compounds
Abstract
Alkyl(hetero)aromatic α-hydroxyamino oximes with the anti configuration of the oxime group reacted with ethyl glyoxylate to form 5-aryl(hetaryl)-1-hydroxy-1H-imidazole-2-carboxylic acid ethyl esters. In the case of 4-fluorophenyl-, 4-chlorophenyl-, and 4-methoxyphenyl-substituted α-hydroxyamino oximes, 3-aryl-5-hydroxy-5,6-dihydro-4H-1,2,5-oxadiazine-6-carboxylic acid ethyl esters were also formed. The positions of the substituents in the imidazole ring were established on the basis of a comparative analysis of the spectroscopic data of these products and the synthesized isomeric compound, 1-hydroxy-5-methyl-4-phenyl-1H-imidazole-2-carboxylic acid ethyl ester. 5-Aryl(hetaryl)-1H-imidazole-2-carboxylic acids were obtained in the reaction of 5-aryl(hetaryl)-1-hydroxy-1H-imidazole-2-carboxylic acids ethyl esters with chloroacetone.