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. Author manuscript; available in PMC: 2007 Dec 15.
Published in final edited form as: Bioorg Med Chem Lett. 2006 Sep 25;16(24):6306–6309. doi: 10.1016/j.bmcl.2006.09.012

Scheme 2.

Scheme 2

(a) Stiles’ reagent, DMF (at 110 °C); (b) CH2N2, Et2O, THF (room temp.); (c) PhSeCl, pyr., CH2Cl2 (at 4 °C); 30% H2O2, CH2Cl2 (at 4 °C); (d) aqueous KOH, MeOH (reflux); (e) DAST, CH2Cl2 (−78 °C).