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. Author manuscript; available in PMC: 2008 Oct 6.
Published in final edited form as: J Med Chem. 2007 Apr 11;50(9):2089–2099. doi: 10.1021/jm061305c

Scheme 1a.

Scheme 1a

a Reagents and conditions: (a) N-Boc-ethylenediamine, HBTU, HOBt, DIEA, DMF/CH2Cl2, 78%; (b) BH3-THF, THF, −10 °C, 56%; (c) Benzoyl peroxide, Na2HPO4, Et2O/THF, 70 °C, 68%; (d) 0.3% NaOH, MeOH, ~quant.; (e) 50% TFA, CH2Cl2, ~quant.