N-Chlorosulfonamide, a Useful Reagent for Chlorination of Various Carbanionic Substrates

摘要

N,N-Dichloro-4-methylbenzenesulfonamide prepared in high yield by treatmetn of corresponding sulfonamide with satureated solution of calcium hypochlorite, acts as site-selective electrophilic chlorinating agent towards carbanionic substrates. #beta#-Ketoesters and #beta#-diketones were chlorinated by this reagent without using any bases. The reagent can be recovered, rechlorinated and resused several times.