1: phenylchloropyruvic acid methyl ester; N-(4-methyl-2-pyridinyl)-N'-phenyl thiourea in dichloromethane 5 h; 2: 1,2-diamino-benzene With acetic acid 1 h; Heating; Further stages.;

Ni-PO in benzene 5 h; Heating;

in dichloromethane T=20°C; 24 h;