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. Author manuscript; available in PMC: 2008 Aug 14.
Published in final edited form as: J Am Chem Soc. 2006 Jun 14;128(23):7463–7465. doi: 10.1021/ja0618954

Scheme 3.

Scheme 3

Reagents. (a). 1. 3a, t-BuLi, HMPA. 2. K2CO3, MeOH, 73% over 2 steps. (b). 1. PPTS. 2. K2CO3, MeOH, 73% over 2 steps. 3. PIFA, 74%. (c) 1. SO3·Py, DMSO, 83%. 2. 2, NiCl2, CrCl2, 84%. 3. Dess-Martin oxidation, 79%. (d). 1. HF·Py, Py. 2. RCOCl, NEt3.