1: H2O, NaOH / methanol 2: N-hydroxybenzotriazole, triethylamine, dicyclohexylcarbodiimide / formamide / 10 h. 0 deg C, 10 h. room temp. 3: H2O, NaOH / methanol 4: N-hydroxybenzotriazole, triethylamine, dicyclohexylcarbodiimide / dimethylformamide 5: H2O, NaOH / methanol 6: N-hydroxybenzotriazole, triethylamine, dicyclohexylcarbodiimide / dimethylformamide 7: NH3 / methanol 8: HCl, acetic acid / various solvent(s) / 1.5 h View Scheme