Synthesis of tricyclic lactones containing 2-azabicyclo[3.3.1]nonane skeleton via tandem intramolecular photocyclization of 2-(1-naphthyl)ethyl ω-anilinoalkanoate
Irradiations of 2-(1-naphthyl)ethyl 3-anilinoalkanoates (3a-c) in degassed benzene afforded tricyclic lactones (4a-c) containing 2-azabicyclo[3.3.1]nonane skeleton as major products via photo-induced electron transfer.