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. Author manuscript; available in PMC: 2015 Feb 15.
Published in final edited form as: Bioorg Med Chem Lett. 2014 Jan 13;24(4):1062–1066. doi: 10.1016/j.bmcl.2014.01.011

Scheme 1.

Scheme 1

Reagents and conditions. (a) Boc2O, Pd(OH)2/C, H2 (50 psi), EtOH, rt; (b) NH2OH, MeOH, 100 °C; (c) ‘Raney’ Ni, H2 (50 psi), rt; (d) ArCOCl, DIEPA, CH2Cl2, 0 °C; (e) 4 N HCl/dioxane, rt; (f) RSO2Cl, DIEPA, CH2Cl2, rt. Overall yields range from 10–34%.