Abstract:
A diverse reactivity of diazo compounds with nitrosoarene in an oxygen-transfer process and a formal [2 + 2]
cycloaddition is reported. Nitosoarene has been exploited as a mild
oxygen source to oxidize an in situ generated carbene intermediate
under visible-light irradiation. UV-light-mediated in situ generated
ketenes react with nitosoarenes to deliver oxazetidine derivatives. These
operationally simple processes exemplify a transition-metal-free and
catalyst-free protocol to give structurally diverse α-ketoesters or
oxazetidines.
