CsF and Cul do the trick: Stille coupling reactions of aryl/vinyl iodides, triflates, and bromides with aryl/vinyl stannanes are greatly enhanced by the inclusion of CsF and Cul in the reaction mixture (see scheme; Conditions A: [Pd(PPh3)4]/CsF/ Cul/DW/45 °C; Conditions B: PdCl 2/ PtBu3/CsF/Cul/DMF/45 °C).