1: methanecarbohydroxamic acid With potassium tert-butylate in N,N-dimethyl-formamide T=30°C; 2: 3-cyano-4-fluoro-bromobenzene in N,N-dimethyl-formamide 3: With potassium tert-butylate in N,N-dimethyl-formamide

methanecarbohydroxamic acid; potassium tert-butylate in N,N-dimethyl-formamide T=20 - 50°C; 1.5 h;