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potassium carbonate in N,N-dimethyl-formamide T=60°C; 0.5 h; Yield given;

1: 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide hydrochloride, 4-(N,N-dimethylamino)pyridine, imidazole / dimethylformamide / 3 h / Ambient temperature 2: 4 N aq. NaOH / methanol / 2 h / 60 °C 3: K2CO3 / dimethylformamide / 0.5 h / 60 °C View Scheme

1: 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide hydrochloride, 4-(N,N-dimethylamino)pyridine, imidazole / dimethylformamide / 3 h / Ambient temperature 2: 4 N aq. NaOH / methanol / 2 h / 60 °C 3: K2CO3 / dimethylformamide / 0.5 h / 60 °C View Scheme