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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Bioorg Med Chem Lett. 2013 May 1;23(13):3910–3913. doi: 10.1016/j.bmcl.2013.04.062

Scheme 1.

Scheme 1

(a) NaH, DMF, RI or RBr, 43–75%; (b) TFA, dichloromethane, rt, 4 h, 36–96%; (c) ROH, NaH, DMF, 0 °C to rt, 4 h, 26–93%; (d) RSH, NaH, DMF, 0 °C to rt, 4 h, 16–56%; (e) TFA, dichloromethane, rt, 4 h, 30–78%.