1: 77 percent / NaH / benzene / Ambient temperature 2: 81 percent / piperidine, glacial acetic acid / benzene / 12 h / Heating 3: LiJ, Collidin / 6 h / Heating View Scheme

1: 77 percent / NaH / benzene / Ambient temperature 2: 86 percent / HCl, trimethylchlorosilane / CHCl3 / 16 h / Ambient temperature 3: 81 percent / LiJ, collidine / 6 h / Heating View Scheme

4-Acetylaminobenzenesulfonyl Azide; 1,8-diazabicyclo[5.4.0]undec-7-ene in acetonitrile T=20°C;