The thermally activated or microwave-induced one-pot three-component condensation of arylglyoxal hydrates, 1,3-dimethylbarbituric acid, and guanidine salts or methylisothiuronium hydroiodide gave respectively 2-amino-5-aryl- and 5-aryl-2-methylsulfanylimidazoles containing a 1,3-dimethylbarbituric acid residue. An unexpected course for the condensation was discovered in the case of guanidine hydrochloride, leading to 5-(2-aryl-2-oxoethyl)-1,3-dimethylbarbituric acids. 2-Amino-2-arylimidazoles under the conditions of such three-component condensation formed Michael adducts involving 5-(2-aryl-2- oxoethylidene)-1,3-dimethylbarbituric acids and the C-5 atom of the imidazole ring.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 935-944, June, 2013.
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Kolos, N.N., Chechina, N.V., Zamigailo, L.L. et al. Simple and efficient synthesis of trisubstituted imidazoles. Chem Heterocycl Comp 49, 872–881 (2013). https://doi.org/10.1007/s10593-013-1321-2
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DOI: https://doi.org/10.1007/s10593-013-1321-2