1.1: pyridine; 'Triton'-B / methanol / 2 h / Heating 2.1: 43.4 percent / Et3N / toluene / 6 h / 20 °C 3.1: N2H4*H2O; sodium acetate; AcOH / methanol / 2 h / Heating 3.2: 75 percent / HCl / diethyl ether 4.1: 88.5 percent / Et3N / CH2Cl2 / 20 °C View Scheme