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Reagents and conditions: (a) di-tert-butyl-dicarbonate, dioxane, NaOH 1 N, from 0 °C to r.t., 24 h; (b) isobutylchloroformate, DMF dry, N2, −15 °C to r.t., 24 h; (c) EDC HCl, DMAP, DMF dry, N2, 0 °C, 24 h; (d) HCl 4 N, dioxane, r.t. 24 h; (e) 1, CHCl3, b.t. 24–48 h.
