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. 2019 Mar 7;24(5):946. doi: 10.3390/molecules24050946

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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 3 — Reagents and conditions: (a) NaH, DMF, rt. (b) iron dust, ammonium chloride, isopropanol-water, reflux. (c) sodium bisulfite, DMF, 140 °C. (d) (i) HCl gas/EtOH, rt. (ii) NH₃ gas / EtOH, rt.