Iron-Catalyzed Redox Radical Cyclizations of 1,6-Dienes and Enynes
摘要:
Treatment of 1,6-dienes and enynes with FeCl3 or Fe(Pc) in the presence of NaBH4 and air or O-2 causes radical cyclization to give five-membered carbo or heterocyclic compounds, Into which a halogen atom or hydroxyl group was introduced.
A palladium-catalyzed, photochemical tandem cyclization/dicarbofunctionalization of unactivated alkyl halides containing an alkene moiety offers an appealing route to produce five- or six-membered rings in a redox-neutral fashion. Multisubstituted carbo- and heterocyclic compounds were prepared through the formation of new C–B or C–O bonds, which provides a convenient synthetic route for further transformations