1: triethylamine / dichloromethane / 16 h / 0 - 20 °C 2: sodium carbonate; tetra(n-butyl)ammonium hydrogensulfate / acetonitrile / 48 h / 20 °C / |Reflux 3: potassium carbonate; 18-crown-6 ether / toluene / 4 h / |Reflux 4: hydrogenchloride / acetone; isopropyl alcohol / 1 h / 0 - 5 °C View Scheme

With  triethylamine in  diethyl ether  1) 0 deg C, 20 min; 2) rt, 2 h;