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. 2013 Jan 10;14(1):1293–1309. doi: 10.3390/ijms14011293

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© 2013 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Scheme 1 — Synthesis of alkyl-, acetyl- and nitro-coumarin derivatives. Reagents and Conditions: (a) Acetic Anhydride, Pyridine, rt., ultrasound irradiation; (b) Allyl Bromide, Geranyl Bromide, Prenyl Bromide, or Ethyl Chloroacetate, K₂CO₃, Acetonitrile, reflux; (c) HNO₃/AcOH, 0–5 °C for 30 min, then 90 min at rt.