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. 2019 Nov 5;24(21):4003. doi: 10.3390/molecules24214003

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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 — Synthetic procedures of coumarin derivatives (7). Reagents and conditions: (i) Method 1. H₂SO₄, 0 °C and (ii) 2-Bromo-5-phenyl-1,3,4-thiadiazole (compound 3), K₂CO₃, DMF, 80 °C. Method 2. substituted sulfuryl chloride, TEA, DCM, r.t.