Abstract
The reaction of N, N-dibromobenzenesulfonamide (I) with over two molar excess of dihydropyran (II) was investigated. Contrary to the result of the previously reported reactions of I with cycloalkenes, bis adducts, trans-trans and trans-cis types of N, N-(bis-3-bromotetrahydropyranyl-2) benzenesulfonamide (VI and VII) were obtained. And when N-methyl-N-bromobenzenesulfonamide (X) was made to react with II, addition reaction predominantly occurred, giving N-methyl-N-(3-bromotetrahydropyranyl-2) benzenesulfonamide (XI).
