Journal
CHEMICAL COMMUNICATIONS
Volume 58, Issue 19, Pages 3194-3197Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cc06935g
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Funding
- National Natural Science Foundation of China [22001220]
- Open Project of State Key Laboratory of Applied Organic Chemistry (Lanzhou University) [202102]
- Collaborative Fund of Luzhou Government and Southwest Medical University [2019LZXNYDJ28, 2018LZXNYD-ZK23]
- Southwest Medical University [2019ZZD003]
- Scientific Research Foundation for Talent Introduction of Southwest Medical University [05/0040026, 05/00040131]
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In this study, a hydrogen-bond-assisted visible-light-mediated [2+2] cycloaddition reaction was used to synthesize a range of indole derivatives containing redox-sensitive aliphatic amines, yielding various cyclobutane-fused polycyclic indoline compounds, especially bridged-cyclic indolines. Mechanistic studies revealed that the success of the reaction was attributed to the formation of hydrogen bonds between the N-atom and the alcohol proton of TFE or HFIP, which prevented or blocked the single-electron transfer from the aliphatic amine functionality to the excited photocatalyst.
Redox-sensitive functionalities such as aliphatic amines with low oxidation potentials and easily oxidized by photocatalysts are generally not compatible with photocatalytic reactions. We describe a hydrogen-bond-assisted visible-light-mediated [2+2] cycloaddition of redox-sensitive aliphatic-amine-containing indole derivatives providing a range of cyclobutane-fused polycyclic indoline derivatives, especially bridged-cyclic indolines. Mechanistic studies indicated that the success of the reaction was based on on the formation of H-bonds between the N-atom and alcohol proton of TFE or HFIP, with this formation preventing or blocking the single-electron transfer from the aliphatic amine functionality to the excited photocatalyst.
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