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. 2022 Apr 27;23(9):4827. doi: 10.3390/ijms23094827

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Scheme 2 — Reagents and conditions: (a) OHBt, DCC, NEt₃, dry DMF, the appropriate 6a–g, N₂, 0 °C, 15’, then 60 °C, 48 h; (b) Benzoyl chloride, toluene, H₂O, 2M Na₂CO₃, r.t., 6 h; (c) Na°, EtOH abs, r.t., 1 h; (d) 2-phenylethyl bromide (2b), K₂CO₃, dry DMF, 80 °C, 4 h; (e) NaOH 40%, EtOH 96%, reflux, 2 h; HCl 6N.