A new palladium-catalyzed highly regioselective allylic CâH amination of alkenes with NFSI in the presence of a catalytic amount of water was developed and successfully expanded to Selectfluor-mediated palladium-catalyzed aminations of alkenes with N-tosylcarbamates in water at room temperature.
A versatile photochemical ring contraction is reported for the synthesis of oxetanes under catalyst-free conditions. The reaction is enabled by the use of 2,5-dihydrofurans and diazo compounds under visible light irradiation, delivering functionalized 3-vinyloxetanes as major products. The outstanding features of this protocol include mild reaction conditions, operational simplicity and scalability