(tBuCN)2CuOTf; 1-Fluoro-2,4,6-trimethylpyridinium trifluoromethanesulfonate in ethyl acetate T=25°C; 12 h; Inert atmosphereGlovebox;

aluminium trichloride in dichloromethane T=-78°C; 4 h;

palladium(II) dichloride bis[bis(diphenylphosphine)ferrocene] dichloromethane; 1,8-diazabicyclo[5.4.0]undec-7-ene; lithium chloride in N,N-dimethyl-formamide T=100°C; Stille carbonylative cross-coupling; 16 h;