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Alkynylation of C (O)–H Bonds Enabled by Photoredox‐Mediated Hydrogen‐Atom Transfer
Abstract:The development of new hydrogen‐atom transfer (HAT) strategies within the framework of photoredox catalysis is highly appealing for its power to activate a desired C−H bond in the substrate leading to its selective functionalization. Reported here is the first photoredox‐mediated hydrogen‐atom transfer method for the efficient synthesis of ynones, ynamides, and ynoates with high regio‐ and chemoselectivity by direct functionalization of Curn:x-wiley:14337851:media:anie201708037:anie201708037-math-0002 (O)−H bonds. The broad synthetic application of this method has been demonstrated by the selective functionalization of C(O)−H bonds within complex molecular scaffolds.
Keywords:carbonyl radicals  C−  H activation  hydrogen-atom transfer  hypervalent compounds  photocatalysis
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