1: With diphenyl diselenide; potassium carbonate; hydrazine hydrate in dimethyl sulfoxide T=70°C; Substitution; 7 h; 2: With triethylamine in tetrahydrofuran T=20°C; oxidative elimination; 5 h; 3: With oxalic acid in water; acetone T=20°C; Hydrolysis; 1 h; Further stages.;

1: With potassium carbonate; hydrazine hydrate in dimethyl sulfoxide T=70°C; Substitution; elimination; 7 h; 2: With oxalic acid in water; acetone T=20°C; Hydrolysis; 2 h; Further stages.;