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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 1 — The synthetic protocol for 2,3-dihydrocyclopenta[c]chromen-4(1H)-one derivatives (5). Reagents and conditions: (i) Hydrazinecarbothioamide, EtOH/H₂O, r.t.; (ii) FeCl₃⋅6H₂O, EtOH, 80 °C; (iii) CuBr₂, isoamyl nitrite, CH₃CN, r.t; (iv) Conc. H₂SO₄, 2-methylbenzene-1,3-diol, 0 °C and (v) K₂CO₃, DMF, 80 °C.