Organophotocatalytic [2+2] Cycloaddition of Electron-Deficient Styrenes**

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Abstract

A visible-light organophotocatalytic [2+2] cycloaddition of electron-deficient styrenes is described. Photocatalytic [2+2] cycloadditions are typically performed with electron-rich styrene derivatives or α,β-unsaturated carbonyl compounds, and with transition-metal-based catalysts. We have discovered that an organic cyanoarene photocatalyst is able to deliver high-value cyclobutane products bearing electron-deficient aryl substituents in good yields. A range of electron-deficient substituents are tolerated, and both homodimerisations and intramolecular [2+2] cycloadditions to fused bicyclic systems are available by using this methodology.

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Golfmann, M., Glagow, L., Giakoumidakis, A., Golz, C., & Walker, J. C. L. (2023). Organophotocatalytic [2+2] Cycloaddition of Electron-Deficient Styrenes**. Chemistry - A European Journal, 29(3). https://doi.org/10.1002/chem.202202373

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