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The condensation of 1-substituted 9,9a-dihydro-1H-imidazo[1,2-a]indol-2(3H)-ones with 2hydroxy-6-nitro-1-naphthaldehyde afforded 1′-carbamoylmethyl-8-nitrospiro[benzo[f]chromene3,2′-indole] derivatives, which underwent intramolecular cyclisation to derivatives of 3-nitro7a,15-methanonaphtho[1′,2′:6,7][1,3]oxazepino[3,2-a]indole upon treatment with a strong base. Laser excitation of the obtained uncoloured molecules of transand cis-3-nitro-7a,15-methanonaphtho[1′,2′:6,7][1,3]oxazepino[3,2-a]indole induced the formation of short-lived photogenerated species, which absorb in the visible spectrum and thermally revert to the ground state on a nanosecond time scale.

Synthesis, crystal structures, and laser flash photolysis of 3-nitro-7a,15-methanonaphtho[1',2':6,7][1,3]oxazepino[3,2-a]indole derivatives