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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Bioorg Med Chem. 2010 Jan 25;18(5):1899–1909. doi: 10.1016/j.bmc.2010.01.037

Scheme 2a.

Scheme 2a

aReagents and conditions: (a) see ref 16; (b) succinic anhydride, NaOAc, Na2SO3, DMF, Ar, 18 h, rt, 82%; (c) K2Cr2O7, CH3COOH, 20 h, rt, 44%; (d) SeO2, 1,4-dioxane, H2O, 11 h, reflux, 57%.