A facile one-pot synthesis of (Z)-α-chloro-α,β-unsaturated esters from alcohols

Treatment of N-Chlorosuccinimide with (ethoxycarbonylmethylene)-triphenylphosphorane followed by oxidation of alcohol using DMSO/SO3.Pyridine complex as a mild oxidant and trapping of the aldehydes constitutes a stereoselective single flask procedure for the preparation of Z-configured α-chloro-α,β-unsaturated esters.