1: 89 percent / triethylamine / dimethylformamide / Heating 2: 1.) H2O, p-toluenesulfonic acid, 2.) periodic acid / 1.) CH3OH, reflux, 1 h, 2.) CH3OH, RT, 2 h View Scheme

Multi-step reaction with 2 steps 1: NaH / tetrahydrofuran / 4 h / 20 °C2: tetrahydrofuran / 2 h / -78 - -20 °C  

With  hydrogenchloride in  tetrahydrofuran; diethyl ether  Yield given;