1: 60 percent / 1 h / 200 °C 2: 98 percent / N-ethyl-N'-(3-dimethylaminopropyl)carbodiimide hydrochloride; 1-hydroxybenzotriazole monohydrate; TEA / CH2Cl2 / 72 h / 20 °C 3: 59 percent / H2; acetic acid / Pd/C / ethyl acetate / 1 h / 20 °C View Scheme