The sodium tungstate catalyzed oxidation of secondary amines with hydrogen peroxide gives the corresponding nitrones. Acyclic and cyclic nitrones can be obtained from secondary amines in a single step in good to excellent yields. The oxidation of secondary amines in the presence of alkenes gives isoxazolidines by 1, 3-dipolar cycloaddition of nitrones. Introduction of a substituent at the a-position of secondary amines can be ...
