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. Author manuscript; available in PMC: 2011 Jun 24.
Published in final edited form as: J Med Chem. 2010 Jun 24;53(12):4768–4778. doi: 10.1021/jm100424m

Scheme 4.

Scheme 4

a

a Reagents and conditions: (a) i. MsCl, Et3N, THF, 0 °C; ii. NaN3, DMF, 80 °C, 37% for 2 steps; (b) NH, MeOH, 92%; (c) CuSO4·5H2O, sodium ascorbate, tBuOH/H2O (1:1), 86%; (d) 80% (v/v) TFA, H2O, 48%.