When irradiated at λ = 366 nm or at λ = 420 nm in the presence of an appropriate sensitiser the title compounds underwent a di-π-methane rearrangement which led to the formation of tricyclic azasemibullvalenones (2a,2a1,2b,4a-tetrahydroazacyclopropa[cd]pentalenones) in yields of 63–87%.
A. Tröster and T. Bach, Chem. Commun., 2019, 55, 302 DOI: 10.1039/C8CC08704K
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