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. 2020 Dec 3;25(23):5693. doi: 10.3390/molecules25235693

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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 4 — Preparation of target compounds 32f. Reagents and conditions: (a) tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate (14h), Pd(dppf)Cl₂, K₂CO₃, V_{(1,4-dioxane)}:V_(H2O) = 5:1, 60 °C, N₂, 2 h; (b) EtOAc (HCl), EtOAC, rt, 2 h.