Dimethyl Sulphoxide a Useful Reagent for Organic Synthesis

Abstract

Dimethyl sulphoxide as a reagent brings about N-methylthiomethylation and N,N/-methylthiomethylation in substituted barbituric acids. It converts 4-acetoxy coumarins to corresponding ylides and brings about methylene insertion in 1,6-naphtharidenes at reflux temperature.DMSO activated by trifluoro-aceticanhydride brings about formation of mono, bis and tris-sulphonic substituted derivatives when interacted with cyclo pentadiene and trimethylsilyl cyclopentadiene.This reagent converts 3-Nitro-4-hydroxy coumarins to salicylic acid in dichloromethane at low temperature.DMSO-acetic anhydride reagent converts enols to sulphur ylides, introduces methylthiomethyl group into phenols and oxidizes secondary alcohols to corresponding ketones. It brings about oxidative rearrangement in polyporic acid and converts 4-hydroxy coumarins and its 3-substituted derivatives into a wide range of products under different conditions.DMSO-SO3 pyridine complex in presence of triethyl amine oxidizes cis-diols to corresponding quinones.DMSO-activated by N-bromosuccinimide brings about methylation of alcohols and converts diols to their corresponding methylene-acetals.