1: meta-carboxy iodo-benzene With oxalyl dichloride; N,N-dimethyl-formamide in dichloromethane T=20°C; 1 h; 2: diazomethane in diethyl ether; dichloromethane T=0°C; 1 h; 3: With hydrogen bromide in diethyl ether; dichloromethane Further stages.;

copper(ll) bromide in chloroform; ethyl acetate 8 h; Reflux;