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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Bioorg Med Chem Lett. 2010 Jan 4;20(3):841. doi: 10.1016/j.bmcl.2009.12.097

Scheme 3.

Scheme 3

Fluorination of xylo-intermediate 10. (a) DAST, CH2Cl2, rt, 1h, 52%; (b) propyne, Pd(PPh3)4, CuI, NEt3, DMF, rt, 22 h, 65%; (c) CuI, NEt3, MeOH, reflux, 38%; (d) AcOH, 90°C, 15 min, 60%.