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. 2009 Nov 23;7(4):640–653. doi: 10.3390/md7040640

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© 2009 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 3. — Synthesis of 13a and 13b.

Reagents and conditions: (a) benzoyl chloride, trimethylamine, CH₂Cl₂, 1 h, 0 °C, 70%.