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. Author manuscript; available in PMC: 2009 Jun 1.
Published in final edited form as: Bioorg Med Chem. 2008 Apr 18;16(11):6233–6241. doi: 10.1016/j.bmc.2008.04.032

Scheme 1.

Scheme 1

(a) (i)Ac2O, Et3N, reflux, 10 h; (ii) K2CO3(aq), 2 h; (b) H2SO4, CH3OH, reflux, 4 h; (c) VOF3, CH2Cl2, CF3COOH, (CF3CO)2, ice-salt bath, 1 h; (d) LiAlH4, THF, rt, 3 h; (e) PCC, CH2Cl2, rt, 4 h.