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. Author manuscript; available in PMC: 2008 Apr 21.
Published in final edited form as: Bioorg Med Chem Lett. 2005 May 16;15(10):2633–2635. doi: 10.1016/j.bmcl.2005.03.063

Scheme 2.

Scheme 2

Reagents and conditions: (i) DMP, CH2Cl2, 0 °C, 9 h, 91%; (ii) 5, AcOH, NaCNBH3, THF, rt 14 h, 30%; (iii) HF·Py, THF/Py (4:1), 0 °C, 2 h, 51%.