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. 2021 Jul 26;36(1):1665–1678. doi: 10.1080/14756366.2021.1956487

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© 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Scheme 1. — Synthesis routes of OA analogues 2–4, 5a-5c, 6a-6g, 7a-7c and 8a-8c. Reagents and conditions: (a) selectflour, dioxane, nitromethane, 80 °C, 4 h; (b) the Jones reagent, acetone, at 0 °C; (c) RPhNHNH₂, CF₃COOH, acetic acid, 115 °C, overnight; (d) BnCl, K₂CO₃, r.t., overnight; (e) R-CHO (o-amino benzaldehyde or o-amino pyridylaldehyde), KOH, ethanol, refluxed, 5 h; (f) R-CHO, KOH, ethanol, r.t., overnight.