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. Author manuscript; available in PMC: 2011 Jul 8.
Published in final edited form as: J Med Chem. 2010 Jul 8;53(13):5033–5043. doi: 10.1021/jm100274c

Scheme 1.

Scheme 1

aReagents and conditions: (a) TBDMSCl, DMF, 80%; (b) NaNH2, MePPh3Br, Et2O, 72%; (c) Pd(OAc)2, Et3N, PPh3, MeCN, 40%; (d) NaOMe, MeOH, 92%; (e) SO3-pyridine, pyridine; (f) TBAF, MeOH, 15% (for e and f).