Dipolar cycloadditions are excellent processes for generating heterocyclic systems from simple starting materials, but arenes as dipolarophiles have not been extensively explored. Now, the intramolecular dipolar cycloaddition of aromatic rings has been achieved using in situ generated diazoalkenes to produce bicyclic or tricyclic heterocycles.
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Ustoyev, A., Croatt, M.P. Arene additions. Nat. Chem. 15, 745–746 (2023). https://doi.org/10.1038/s41557-023-01190-5