1: flouride ion / tetrahydrofuran 2: NH3 / methanol / 100 °C View Scheme

1: 4-(dimethylamino)pyridine (DMAP) / acetonitrile / 0.08 h / Ambient temperature 2: Bu3SnH, 2,2'-azobis(isobutyronitrile) / toluene / 1 h / 100 °C / radical deoxygenation 3: 88 percent / tetrabutylammonium fluoride (TBAF) / tetrahydrofuran / 0.17 h / Ambient temperature 4: methanolic ammonia / 48 h / 100 °C View Scheme

With  tetrabutyl ammonium fluoride in  tetrahydrofuran 0.333333 h;