tetrakis(triphenylphosphine) palladium(0); sodium carbonate in ethanol; toluene 5.5 h; Heating;

1: 3-nitro-aniline With hydrogenchloride; sodium nitrite in water T=0 - 5°C; 2: thiophene-2-carbaldehyde With CuCl2*2H2O in dimethyl sulfoxide T=15 - 25°C; Meerwein reaction;