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. Author manuscript; available in PMC: 2013 Jul 15.
Published in final edited form as: Bioorg Med Chem Lett. 2012 May 24;22(14):4864–4868. doi: 10.1016/j.bmcl.2012.05.039

Scheme 1.

Scheme 1

Reagents and conditions: (a) Br2, CH2Cl2, rt, overnight; (b) (i) A, DIPEA, rt, 5 h; (ii) NH4OAc, toluene, 100-110 °C, 15-20 h.