1: 93 percent / aq. KOH / methanol / 5 h / 20 °C 2: 61 percent / Et3N / 6 h / 20 °C 3: 76 percent / (COCl)2; DMSO; Et3N / CH2Cl2 / -78 - 0 °C 4: 97 percent / H2 / Pd-C / methanol / 7 h 5: 76 percent / KOH / methanol; H2O / 20 °C View Scheme

potassium hydroxide in methanol T=20°C; 5 h;