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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Bioorg Med Chem. 2013 Apr 6;21(11):2988–2998. doi: 10.1016/j.bmc.2013.03.074

Scheme 2.

Scheme 2

Reagents: (a) (CH3)3OBF4, CH2Cl2, N(C2H5)3; (b) (1) BH3/THF, (2) NaOH, 35% H2O2; (c) (1) NaOH, CH3OH/H2O, (2) HCl; (d) (C2H5)2NSF3, CH2Cl2;