Abstract

Novel five- and six-membered thiocyclic-fused naphthalimide hydroperoxides ( 7, 8) as photonucleases were designed, synthesized via unusual isomerization in Pschorr cyclization and photooxygenation. The five-membered 7 was able to induce single-strand nicks in duplex DNA pH independently (7.0–8.5) at 0.5 μM under 366 nm, while the six-membered 8 could photonick the duplex DNA pH dependently (7.0–8.5) at 5 μM under 450 nm and showed ‘time-controlled’ photo-bioactivity. Their thiocycles and the angular conjugated plane have contributions to their binding affinity with DNA and photocleaving efficiency.

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