1: 2',5'-dimethoxyacetophenone With lithium hexamethyldisilazane in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere; 2: benzoyl chloride in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere;

sodium hydride in benzene 3 h;

potassium carbonate in N,N-dimethyl-formamide T=160°C; 48 h; Inert atmospheresealed tube;