1: α-cyanoacetic acid methyl ester With sodium hydride in dimethyl sulfoxide T=20°C; 0.5 h; 2: 3-cyano-4-fluoro-bromobenzene in dimethyl sulfoxide T=90°C; 3: With water in dimethyl sulfoxide Heating; Further stages.;

dichloro-acetic acid; hydrogen bromide T=0 - 20°C;

1: α-cyanoacetic acid methyl ester With sodium hydride in dimethyl sulfoxide T=20°C; 0.5 h; 2: 3-cyano-4-fluoro-bromobenzene in dimethyl sulfoxide T=90°C; 3: With water in dimethyl sulfoxide Heating; Further stages.;