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CsF and CuI 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 CuI in the reaction mixture (see scheme; Conditions A: [Pd(PPh3)4]/CsF/CuI/DMF/45 °C; Conditions B: PdCl2/PtBu3/CsF/CuI/DMF/45 °C).
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Mee et al. (2004) studied this question.
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