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. 2022 Sep 27;10:984069. doi: 10.3389/fchem.2022.984069

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Copyright © 2022 Ferrisi, Gado, Polini, Ricardi, Mohamed, Stevenson, Ortore, Rapposelli, Saccomanni, Pertwee, Laprairie, Manera and Chiellini.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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SCHEME 4 — Synthetic pathway for the synthesis of compounds JR14a, JR16a and JR22a, JR26a Reagents and conditions: i) CuSO₄·5H₂O, sodium ascorbate, DMF/H₂O 4:1, 80°C, 2 h.