Blue light-promoted [2 + 4] cycloaddition of phosphenes and N -acylimines: highly diastereoselective access to 3,4-dihydro-1,5,2-oxazaphosphinine 2-oxides

Blue light-promoted concerted [2 + 4] heteroatom Diels–Alder cycloaddition of N -acylimines and phosphenes generated from phosphoryl aryl(diazo)methanes, affording highly diastereoselective trans -3,4-dihydro-1,5,2-oxazaphosphinine 2-oxides.