1: 4-iodobenzoic acid ethyl ester; iso-propylmagnesium bromide in tetrahydrofuran T=0°C; 0.333333 h; Inert atmosphere; 2: bis(1,3-benzothiazol-2-yl)methanone in tetrahydrofuran T=0°C; 1 h; Inert atmosphere; 3: With (NH4)2SO4 in tetrahydrofuran; water Inert atmosphere; regioselective reaction;