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. 2019 Nov 1;24(21):3966. doi: 10.3390/molecules24213966

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© 2019 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 2 — Synthesis of tetrahydrothiepine derivatives (compounds 5a–5d); Reagents and conditions: (a) anisol, AlCl₃, 1,2-dichloroetane, (b) Na₂S·9H₂O, acetone, H₂O, (c) Zn, TiCl₄, THF, (d) BBr₃, CH₂Cl₂, (e) m-CPBA, CH₂Cl₂, (f) 3-dimethylamino-1-propanol, Ph₃P, DEAD, THF.