Visible-Light, Photoredox-Mediated Oxidative Tandem Nitroso-Diels-Alder Reaction of Arylhydroxylamines with Conjugated Dienes

Arylhydroxylamines were used in the nitroso-Diels-Alder reaction to generate in situ nitrosoarenes under visible-light, catalytic and aerobic conditions. Mixing a solution of aryl- or heteroarylhydroxylamines with conjuguated dienes in the presence of a catalytic amount of Ru(bpy)(3)Cl-2 afforded 3,6-dihydro-1,2-oxazines in good yields under an oxygen atmosphere.