A redox umpolung strategy for the synthesis of complex tetrahydrocarbazoles is reported. The reaction involves a visible light promoted radical cation [4+2] cycloaddition between 2-vinylindoles and conjugated alkenes that proceeds with good yields and diastereoselectivity.
![Graphical abstract: Synthesis of tetrahydrocarbazoles through a radical cation [4+2] cycloaddition reaction of 2-vinylindoles](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D2CC06723D&imageInfo.ImageIdentifier.Year=2023)
E. Brambilla, E. Moretti, M. Magni, G. Abbiati and V. Pirovano, Chem. Commun., 2023, 59, 3281 DOI: 10.1039/D2CC06723D
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