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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 18 — Synthetic pathway to prepare the Schiff bases (61) and (63) with reagents and conditions, (a) 4-Hydroxybenzaldehyde/anhydrous K₂CO₃/acetonitrile/reflux, (b) substituted amines/ethanol/reflux. (c) 4-aminophenol/anhydrous K₂CO₃/acetonitrile/reflux, (d) substituted benzaldehyde/ethanol/reflux.