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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Bioorg Med Chem Lett. 2011 Oct 5;21(23):6973–6976. doi: 10.1016/j.bmcl.2011.09.123

Scheme 2.

Scheme 2

Reagents and conditions: (a) NaH, NaI, DMF; (b) i: TFA, CH2Cl2, ii: TEA, AcCl, CH2Cl2, 18 h; (c) H2, 10% Pd/C, MeOH, 2 h.