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. 2013 Aug 15;14(8):16851–16865. doi: 10.3390/ijms140816851

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Scheme 1 — Reagents and conditions: (i) Ag₂O, CH₂Cl₂, 58%; (ii) Trimethylsilyl trifluoromethanesulfonate (TMSOTf), CH₂Cl₂, 35%; (iii) CdCO₃, Celite, toluene, reflux; (iv) 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI), tetrahydrofuran (THF), 30%.