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Reagents and conditions: a) SOCl2, EtOH, 0°C, 0.5h, rt, 3h, reflux, 1h; b) (Boc)2O, NaOH, H2O, Dioxane, rt, 12h; c) DIBAL-H, CH2Cl2, −78°C, 3h; d) NaBH(OAc)3, CH2Cl2, rt, 8h; e) 6NHCl, EtOAc, rt, 3h; f) EDC.HCl, CH2Cl2, rt, 6h.
