oxalyl dichloride in chloroform T=20°C; Heating / reflux;

1: 1.) triethylamine; 2.) 20percent HCl / 1.) chloroform, 35 deg C, 5 h; 2.) chloroform, reflux, 5 h 2: sodium hydroxide / ethanol / 1 h / Heating 3: 1.) hydrazine hydrate; 2.) potassium hydroxide / 1.) triethanolamine, 130 deg C; reflux, 4 h; 2.) triethanolamine, 200 deg C, 9 h View Scheme

in tetrahydrofuran T=-78°C; 0.5 h; Yield given;

ammonia in toluene 1 h;