Photo-induced intramolecular dearomative [5 + 4] cycloaddition of arenes for the construction of highly strained medium-sized-rings

Min Zhu, Yuan-Jun Gao, Xu-Lun Huang, Muzi Li, Chao Zheng () and Shu-Li You ()
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Min Zhu: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Yuan-Jun Gao: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Xu-Lun Huang: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Muzi Li: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Chao Zheng: University of Chinese Academy of Sciences, Chinese Academy of Sciences
Shu-Li You: University of Chinese Academy of Sciences, Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Medium-sized-ring compounds have been recognized as challenging synthetic targets in organic chemistry. Especially, the difficulty of synthesis will be augmented if an E-olefin moiety is embedded. Recently, photo-induced dearomative cycloaddition reactions that proceed via energy transfer mechanism have witnessed significant developments and provided powerful methods for the organic transformations that are not easily realized under thermal conditions. Herein, we report an intramolecular dearomative [5 + 4] cycloaddition of naphthalene-derived vinylcyclopropanes under visible-light irradiation and a proper triplet photosensitizer. The reaction affords dearomatized polycyclic molecules possessing a nine-membered-ring with an E-olefin moiety in good yields (up to 86%) and stereoselectivity (up to 8.8/1 E/Z). Detailed computational studies reveal the origin behind the favorable formation of the thermodynamically less stable isomers. Diverse derivations of the dearomatized products have also been demonstrated.

Date: 2024
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DOI: 10.1038/s41467-024-46647-4

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