Reaction of N-Halosulfonamide. V. Reaction of N, N-Dibromobenzenesulfonamide with Dihydropyran. (1)

Abstract

Reaction of N, N-dibromobenzenesulfonamide with dihydropyran in 1 : 1 molar ratio was investigated. In the first step, unstable N-bromo addition product (III) was formed ; then the bromine atom at nitrogen was reduced by the treatment with ethanol or water and a mixture of stereoisomers (IV and V) was obtained. The structures of IV and V were established.