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. 2020 Mar 11;25(6):1265. doi: 10.3390/molecules25061265

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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 3 — i: (1) NaN₃/TFA or H₂SO₄ (2) H₂O (rac-8a: 78%, rac-8b: 73%, rac-8c: 76%); ii: LAH/THF, reflux (rac-9a: 80%, rac-9b: 91%, rac-9c: 94%); iii: 2-fluoro-5-nitrobenzaldehyde or 2-chloro-5-nitrobenzaldehyde, K₂CO₃, toluene, reflux (rac-1a: 95%, rac-1b: 78%, rac-1c: 81%).