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. 2021 Mar 12;13(6):1244. doi: 10.3390/cancers13061244

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© 2021 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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Reagents, solvents and conditions: (a) 4-aminophenol, NaHCO₃, EtOH, 100 °C, 20 h; (b) (±)-epichlorohydrin, MeCN, K₂CO₃, 80 °C, 16 h; (c) morpholine, MeOH, r.t., 36–48 h; (d) Me₂NH × HCl, MeOH, 70 °C, 24 h; (e) 3-dimethylamino-1-propyl chloride hydrochloride, Cs₂CO₃, DMF, 100 °C, 3 h.