beta -Benzamidoalkyl phenyl selenides can be oxidised, using mCPBA, to the
corresponding selenones which can be cyclised to oxazolines or aziridines d
epending on the reaction conditions. In neutral or weakly basic conditions
the oxazoline is the major product but if the oxidation is conducted at -60
degreesC then the corresponding aziridine is formed in high yields using s
trongly basic conditions. The synthesis of a range of bicyclic N-benzoyl az
iridines is described.