2-Allyloxybenzaldehydes undergo [2 + 1] cycloadditions under 365 nm LED irradiation to form the corresponding chroman-fused cyclopropanols. The reaction proceeds easily without any catalysts or additives in dimethyl sulfoxide.
![Graphical abstract: Synthesis of chroman-annulated cyclopropanols via photoinduced intramolecular [2 + 1]-cycloaddition of 2-allyloxybenzaldehydes](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=D3OB01520C&imageInfo.ImageIdentifier.Year=2023)
E. R. Zaitseva, V. E. Opryshko, D. S. Ivanov, A. A. Mikhaylov, A. Yu. Smirnov and M. S. Baranov, Org. Biomol. Chem., 2023, 21, 9082 DOI: 10.1039/D3OB01520C
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