1: 75 percent / N-methylmorpholine, dicyclohexylcarbodiimide, HOBt / dimethylformamide / 1) pH 8, -20 deg C, 1 h, 2) rt, 48 h 2: 90 percent / aq. NaOH / dioxane; H2O / 1 h 3: H2 / 10percent Pd/C / dimethylformamide / 1 h View Scheme