1: 60 percent / p-toluenesulphonyl azide, triethylamine 2: diethyl ether / Ambient temperature View Scheme

1: 60 percent / p-toluenesulphonyl azide, triethylamine 2: diethyl ether / Ambient temperature 3: 70 percent / triethylamine / diethyl ether 4: 65 percent / copper(I) chloride / diethyl ether 5: 85 percent / zinc / acetic acid / Heating View Scheme