Single step formation of novel tricyclic systems on [3 + 2] photocycloaddition of 3-(1-alkynyl) cyclohexenones to methoxyalkenes

Article abstract of DOI:10.1016/S0040-4039(00)89034-6

Irradiation of 1b (λn350 nm) in tert-butyl alcohol solution containing 5 leads to the novel ring system 9b in a single step. Similar reactions occur between 1a and both 5 and 6. Mechanisms of these transformations are discussed.