1: 90 percent / KOH / methanol / 2 h / 50 °C 2: 97 percent / Cs2CO3 / acetonitrile / 24 h / 20 °C 3: 92 percent / H2 / Pd-C / ethyl acetate / 24 h / 20 °C 4: 92 percent / KOH / methanol / 1 h / 20 °C 5: aq. HCl / methanol / 3 h / Heating View Scheme