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. 2019 Mar 19;24(6):1080. doi: 10.3390/molecules24061080

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© 2019 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 — Synthetic route for 2-arylazomalononitrile derivatives 2a–c and 3a,b. Reagents and Conditions: (a) NaNO₂/HCl/stirring at 0–5 °C 1 h; (b) CH₂(CN)₂/CH₃COONa/50% eq. EtOH/stirring at 0–5 °C 2 h; (c) 2a/piperidine or morpholine/EtOH/reflux 1 h.