1: pyridine / CH2Cl2 / 0.5 h 2: 1.) NaH, 2.) 18-crown-6 / 1.) DMF, 80 deg C, 20 min, 2.) DMF, a) 0 deg C, 6 h, b) RT, overnight 3: 99 percent / 5percent aq. HCl / methanol / 24 h / Ambient temperature View Scheme