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Reagents and conditions: (a) BOC-gly-gly/DCC/DMAP, CHCl3 25°C 4 h; (b) (i) 4.0 M HCl/dioxane, 40 min; (ii) Et3N; (c) BOC-gly-pro-p-nitrophenyl ester /DMAP, CHCl3, rt, 36 h; (d) 4.0 M HCl/dioxane, 30 min; (e) BOC-phe-gly/DCC/DMAP, CHCl , 25°C, 3 h; (f) 4.0 M HCl/dioxane, 2.5 h; (g) N-Cbz-D-phe-p-nitrophenyl ester/DMAP, CHCl3, rt 72 h.
