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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Bioorg Med Chem Lett. 2011 Aug 8;21(19):5774–5777. doi: 10.1016/j.bmcl.2011.08.009

Scheme 1.

Scheme 1

Reagents and conditions: (a) K2CO3, H2O; (b) NH2NH2, AcOH, 100 °C (20%); (c) P2S5, pyridine, 120 °C (80%); (d) R2Br, K2CO3, DMF (90%); (e) MCPBA, CH2Cl2 (80%).