Derivatives of 4-carboxy-3,5-diphenyl-2-phenyliminothiazoline. synthesis and mass spectral investigation

Methods have been developed for dehydrating the unusually stable intermediate products of the Hantzsch reaction of N,N'-diphenylthioureas with derivatives of phenylchloropyruvic acid, viz. 4-hydroxy-4-methoxy(diethylamino)carbonyl-3,5-diphenyl-2-phenyliminothiazolidines, into the corresponding 4-methoxy(diethylamino)carbonyl-3,5-diphenyl-2-phenyliminothiazolines. Characteristic features of the dissociative ionization of the latter and their anilide analog under the action of electron impact have been clarified. Authors: V. A. Mamedov, I. Z. Nurkhametova, I. Kh. Rizvanov, Yu. Ya. Efremov, and Ya. A. Levin. English Translation in Chemistry of Heterocyclic Compounds , 1999, 35 (11), pp 1364-1369 http://link.springer.com/article/10.1007/BF02252010