1: 42 percent / SnCl4 / 1,2-dichloro-ethane / Ambient temperature 2: 1) NH4OH, 2) NaN3 / 1) MeOH, r.t., 2) DMF, 100 deg C View Scheme

ammonium hydroxide; sodium azide 1) MeOH, r.t., 2) DMF, 100 deg C; Yield given. Multistep reaction;