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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 4.

Scheme 4

(i) chloranil (3 equiv), CHCl3, 80 °C, 16 h, 1′ (50%), 1b′ (10%), 1c′ (15%), 1d (13%); (ii) TFA/CH2Cl2, 1a (95%), 1b (95%) or K2CO3, MeOH, 1c (80%).