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. 2021 Feb 18;26(4):1055. doi: 10.3390/molecules26041055

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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 25 — Synthetic pathway to prepare derivatives of quinoxaline-2,3-dithiones (85,86,87), using different reagents, (a) alkynonitriles/dioxane/KOH/heated at temp 20–25 °C/1 h, (b) 3-phenyl-2-propynonitrile/dioxane/KOH/heated at temp 20–25 °C/5 h, (c) acetylene/dioxane/KOH/heated at temp 200–250 °C/1 h.