1: 85 percent / NaBH4 / ethanol; tetrahydrofuran / 13 h / 40 - 50 °C 2: 1.) isopentyl nitrite, anthranilic acid / 2.) Raney Ni (W-2) / 1.) 1,2-dichloroethane, dichloromethane, reflux, 4 h; 2.) ethanol, reflux, 17 h View Scheme

1: NaBH4 / ethanol; tetrahydrofuran / 13 h / 40 - 50 °C 2: 53 percent / tris(dimethylamino)phosphine / tetrahydrofuran / Ambient temperature; Irradiation View Scheme