1: 1.) sodium amalgam, disodium hydrogen phosphate, 2.) acetic acid, H2O / 1.) MeOH, 4.5 h, 2.) EtOH, ethyl acetate, 45 deg C, 20 min 2: 33.6 percent / pyridine / 4 h / 40 °C 3: 55 percent / ethanol / 1.33 h / Irradiation 4: benzene / 1.) 78-80 deg C, 1.5 h, 2.) 18-22 deg C, 20 d 5: 19.5 percent / 5percent KOH / methanol / 1 h View Scheme