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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 2.

Scheme 2

Reagents and conditions: a) 40% (w/v) KOH, RT, 26%; b) N-hydroxyphthalimide, PPh3, DIAD, THF, RT; c) TFA, CH2Cl2, RT, 80% (two-step yield); d) NH2NH2·H2O, EtOH, RT, quantitative.