1: POCl3 / benzene / 1 h / Heating 2: concd. HCl / 1.) 60 deg C, 30 min, 2.) reflux, 10 min 3: EtOCOCl, Et3N / acetone / 0.25 h / 0 °C 4: aq. NaN3 / acetone / 0.5 h / 0 °C 5: benzene / 1 h / Heating 6: 8 N HCl / 0.17 h / Heating 7: methanol / 24 h / 20 °C View Scheme

1: POCl3 / benzene / 1 h / Heating 2: concd. HCl / 1.) 60 deg C, 30 min, 2.) reflux, 10 min View Scheme