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. Author manuscript; available in PMC: 2009 Jan 8.
Published in final edited form as: J Am Chem Soc. 2006 Sep 13;128(36):11906–11915. doi: 10.1021/ja062364i

Scheme 4a.

Scheme 4a

a Reagents and conditions: (a) PhI(OBz)2, BF3·OEt2, CH2Cl2 (83%); (b) NH3, MeOH, THF (72%); (c) Ph2SO, Tf2O, TBP; add 20 (80%); (d) HF·pyr, THF (99%); (e) 31 or 32, Ph2SO, Tf2O, TBP; then 29; (f) TFA, H2O, CHCl3.