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Synthesis 1989; 1989(7): 518-522
DOI: 10.1055/s-1989-27304
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Novel Ring-Opening Reactions of 3-Substituted 1-Amino-2-thioxo-4-imidazolidinones: Preparation of Functionalized 3,6-Dihydro-2H-1,3,4-thiadiazines and 3,4-Dihydro-1H-1,2,4-triazoles

Pedro Molina* , Antonio Arques, Inmaculada Cartagena, José María Olmos
  • *Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Murcia, E-30001 Murcia, Spain
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Publication Date:
17 September 2002 (online)

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1-Amino-2-thioxo-4-imidazolidinones 1 react with phenacyl bromides to yield 3-alkoxycarbonylmethyl-5-aryl-2-iminio-3,6-dihydro-2H-1,3,4-thiadiazine salts 3. Compounds 1 also react with aryl isothiocyanates to give N-aryl-N′-(3-aryl/alkyl-4-oxo-2-thioxoimidazolidinyl)thioureas 6, which by the action of amines undergo a ring-closure/ring-opening reaction to give 4-aryl-1-aryl/alkylaminocarbonylmethyl-3-sulfido-5-thioxo-3, 4-dihydro-1H-1,2,4-triazole derivatives 7.