1: hydrazoic acid, pyridine / diethyl ether; benzene / 1 h / -20 to 10 deg C 2: 69 percent / 1.) room temperature, 5 d, 2.) 80 deg C, 4 h View Scheme

1: oxalyl chloride, pyridine / tetrahydrofuran / 1 h / Ambient temperature 2: hydrazoic acid, pyridine / diethyl ether; benzene / 1 h / -20 to 10 deg C 3: 69 percent / 1.) room temperature, 5 d, 2.) 80 deg C, 4 h View Scheme

1.) room temperature, 5 d, 2.) 80 deg C, 4 h;

(i) benzene, (ii) (heating); Multistep reaction;

lithium aluminium tetrahydride in tetrahydrofuran