1: 1.) p-toluenesulfonhydrazide, p-TsOH*H2O, 2.) NaBH3CN / 1) EtOH, reflux, 7 h; 2) EtOH, reflux, 4 h 2: 77 percent / aq. NaOH / ethanol / 0.25 h / 80 °C View Scheme