Visible light driven, nickel-catalyzed aryl esterification using a triplet photosensitiser thioxanthen-9-one?
Organic Chemistry Frontiers Pub Date: 2019-05-16 DOI: 10.1039/C9QO00536F
Abstract
We report an approach to the visible light-initiated, nickel-catalyzed esterification of carboxylic acids with aryl bromides. Thioxanthen-9-one works as a triplet photosensitizer to significantly accelerate this cross-coupling to provide aryl esters in moderate to excellent yields at room temperature. A mechanistic investigation indicates that this esterification undergoes the stepwise oxidative addition of an arylbromide to nickel, transmetalation of an aryl–Ni(II) bromide complex, energy transfer from thioxanthen-9-one to an excited-state aryl–Ni(II) carboxylate and reductive elimination to the aryl ester. This study contributes to the utilization of ketones as triplet photosensitisers in photochemical transformations.
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Journal Name：Organic Chemistry Frontiers
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CAS no.: 89640-58-4
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