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. Author manuscript; available in PMC: 2010 Oct 15.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Aug 23;19(20):5884–5886. doi: 10.1016/j.bmcl.2009.08.073

Scheme 1.

Scheme 1

General procedures for the synthesis of compounds 1–13. Reagents and conditions: (a) DMF, pyridine, reflux, 30 min – 2 h; (b) and (c): Dioxane, rt, stirred overnight.