The photoredox cross-coupling of aryl halides and potassium alkyl trifluoroborates is a very effective means to form Csp-Csp bonds. However, this transformation is inefficient for the coupling of unactivated primary trifluoroborates. We have developed a generally useful, continuous flow Csp-Csp coupling procedure for the synthesis of diverse product sets that is compatible with both trifluoroborates and silicate reagents. This universal protocol provides diversity sets from both primary and secondary coupling partners. This easily scalable procedure widens the substrate scope of the coupling reaction and is efficient for producing a greater range of analogues bearing a high sp fraction.
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