Photoredox-Catalyzed Defluorinative [4 + 2] Cycloaddition of α-Fluoro-β-keto Esters and Alkynes by Single Photosensitizer
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A protocol for C-F bond activation using a single organic photocatalyst was developed. The mechanism involves the self-sorting of α-fluorinated-β-keto esters to generate two radicals: one is highly electrophilic and undergoes rapid benzannulation with alkyne... ...