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. Author manuscript; available in PMC: 2010 Sep 15.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Jul 19;19(18):5482–5485. doi: 10.1016/j.bmcl.2009.07.080

Scheme 1.

Scheme 1

(a) 140 °C, 4 h, N2, 73%; (b) substituted phenol, K2CO3, DMF, 120 °C, 6 h, 65-82%; (c) Na2S2O4, NH3·H2O, THF/H2O = 1/1 (v/v), rt, 3h, 41-70%.