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Synthesis of imidazol-2-ones

Hint: Benzimidazolones can be found at www.organic-chemistry.org/synthesis/heterocycles/benzo-fused/benzimidazolones.shtm
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Recent Literature


An intramolecular transition-metal-free base-mediated hydroamination of propargylamine with isothiocyanates enables an atom-economical, regioselective synthesis of diversely substituted imidazole-2-thiones and spiro-cyclic imidazolidine-2-thiones in good yields via  intramolecular 5-exo-dig cycloisomerization.
A. Ranjan, R. Yerande, P. B. Wakchaure, S. G Yerande, D. H. Dethe, Org. Lett., 2014, 16, 5788-5791.