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. Author manuscript; available in PMC: 2011 Aug 12.
Published in final edited form as: J Med Chem. 2010 Aug 12;53(15):5770–5781. doi: 10.1021/jm100582w

Scheme 5.

Scheme 5

a Reagents and conditions: (a) Boc2O, NaHCO3, H2O, MeOH, room temperature, 36 h; (b) BOP, Et3N, CH2Cl2, room temperature, 3 h; (c) CF3COOH, p-TsOH, 0 °C, 0.25 h; (d) 6a, Et3N, CH2Cl2, 0 °C, 0.5 h then room temperature, 3 h.