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. Author manuscript; available in PMC: 2011 Sep 2.
Published in final edited form as: Bioorg Med Chem Lett. 2010 Mar 30;20(10):3112–3115. doi: 10.1016/j.bmcl.2010.03.093

Scheme 2.

Scheme 2

Reagents and conditions: (a) MsCl, Et3N, DMAP, CH2Cl2, 0 °C; (b) Zn, NaI, DME, 86% (for two steps); (c) DIBAL-H, CH2Cl2, −68 °C; (d) Al2O3, 200 °C, 60% (for two steps).