Reaction of sulfene with n,N-disubstituted α-aminomethyleneketones vi. Synthesis of n,n-disubstituted 4-amino-3,4-dihydro-6-phenyl-1,2-oxathiin 2,2-dioxides and of 4-methylphenylamino-3,4-dihydro-5,6-polymethylen-1,2-oxathiin 2,2-dioxides

The title compounds were obtained by cycloaddition of sulfene to N,N-disubstituted 3-amino-1-phenyl-2-propen-1-ones and to 2-metbylphenylaminomethylenecycloalkanones, respectively. Steric and electronic aspects of these reactions, as well as the failure of cycloaddition in the case of N,N-disubstituted 4-arnino-3-buten-2-ones, are also discussed.