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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Bioorg Med Chem. 2013 Mar 5;21(17):5629–5646. doi: 10.1016/j.bmc.2013.02.016

Scheme 2.

Scheme 2

(a) triethyl phosphite, 120°C; (b) H2NNH2, EtOH; (c) NaBH4, EtOH; (d) 35% aq HCl, 60 °C; (e) 48% HBr 90 °C; (f) 2-picoline borane, MeOH.