A series of 3-amino-4-arylazo-4,5-dihydrothiophenes has been synthesized by the reaction of arylhydrazonocyanothioacetamides (containing a tert-cycloalkylamino group) with α-halo ketones, 2-chloroacetonitrile, or 4-nitrobenzyl bromide. Their oxidation in the presence of metal acetates was investigated. It was shown that heating in pyridine with Cu(OAc)2 leads to the formation of thieno- [3,4-d]-1,2,3-triazoliumolates.
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Dedicated to Academician V. N. Charushin on his 60th birthday.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 684–691, May, 2011.
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Belskaya, N.P., Koksharov, A.V., Eliseeva, A.I. et al. Synthesis and oxidative cyclization of 3-amino-2-arylazo-5-tert-cycloalkylaminothiophenes. Chem Heterocycl Comp 47, 564–570 (2011). https://doi.org/10.1007/s10593-011-0799-8
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DOI: https://doi.org/10.1007/s10593-011-0799-8