N,N,N',N',N'',N''-hexamethylphosphoric triamide; Zn(II)(acetylacetonate)2; triphenylphosphine; bis-triphenylphosphine-palladium(II) chloride in tetrahydrofuran T=50 - 55°C; P=760 Torr; 24 h;

aluminium trichloride T=4 - 20°C; Friedel-Crafts reaction; 13 h;