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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Nov 14;20(1):83–86. doi: 10.1016/j.bmcl.2009.11.036

Scheme 5.

Scheme 5

Reagents and conditions: (i) Br2 (2 equiv), MeSO3H, 110 °C, 16 h, 1e (32%), 1f (30%), 1g (31%), 1h (30%).