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. Author manuscript; available in PMC: 2015 Apr 2.
Published in final edited form as: Tetrahedron Lett. 2014 Apr 2;55(14):2270–2273. doi: 10.1016/j.tetlet.2014.02.085

Scheme 1.

Scheme 1

Reagents and conditions: a) NaOH(aq), 45˚C, 85%; b) NiCl2·6 H2O, NaBH4, (Boc)2O, MeOH, 0°C to RT, 72%; c) N-hydroxyphthalimide, PPh3, DIAD, THF, RT, 89%; d) NH2NH2·H2O, EtOH, RT, 93%.