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. 2020 Mar 25;25(7):1487. doi: 10.3390/molecules25071487

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Reagents and conditions: (i) thiosemicarbazide in EtOH, H₂O and glacial CH₃COOH, 3 h at reflux; (ii) semicarbazide ·HCl in EtOH and CH₃COONa 1N, 4 h at reflux.