Copper-Catalyzed Aerobic Oxidative Alkynylation of 3,4-Dihydroquinoxalin-2-ones

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Abstract

Herein, we described a ligand-free copper-catalyzed aerobic oxidative functionalization of 3,4-dihydroquinoxalin-2(1 H)-ones with terminal alkynes using visible-light and oxygen as terminal oxidant to give 3-ethynyl-3,4-dihydroquinoxalin-2(1 H)-one, cyclic propargylic amines, in moderate to good yields. Moreover, we demonstrate the versatility of the 3-ethynyl-3,4-dihydroquinoxalin-2(1 H)-ones obtained by preparing several 3,4-dihydroquinoxalin-2-one derivatives.

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Rostoll-Berenguer, J., Blay, G., Pedro, J. R., & Vila, C. (2020). Copper-Catalyzed Aerobic Oxidative Alkynylation of 3,4-Dihydroquinoxalin-2-ones. Synthesis (Germany), 52(4), 544–552. https://doi.org/10.1055/s-0039-1690244

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