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Endo/Exo-Controllable Photocyclization by EnT-SET-Switch

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ORGANIC LETTERS
卷 25, 期 16, 页码 2863-2867

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AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.3c00837

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CBZ6 is a redox-neutral non-donor-acceptor-type organo-photocatalyst with a strong reductive potential (-2.16 V vs SCE). It can function as a photosensitizer for both single-electron transfer and triplet energy transfer processes, allowing for site-selective control in the intramolecular hydroarylation of acrylamides. This process provides a concise and environmentally sustainable access to a series of oxindoles and dihydroquinolinones without the use of transition metals, halogen-containing reagents, or additional reductants or oxidants.
CBZ6, a redox-neutral non-donor-acceptor-type organo-photocatalyst, presents a strong reductive potential with an oxidative potential of -2.16 V (vs SCE). It can work as a photosensitizer for both single-electron transfer and triplet energy transfer processes. This feature enables site-selective control in the intramolecular hydroarylation of acrylamides. Both 5-exo-trig and 6-endotrig cyclization products could be prepared regiospecfically under mild conditions. No transition metal, halogen-containing reagents, or additional reductant or oxidant is involved. This process provides a concise and environmentally sustainable access to a series of oxindoles and dihydroquinolinones.

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