Abstract
In this study, a series of the (Z)-alpha-chloro-alpha,beta-unsaturated esters 3 were efficiently prepared in a one-pot sequence. In the presence of N-chlorosuccinimide (NCS) and manganese dioxide, under ultrasonication conditions, (carboethoxymethylene) triphenylphosphorane 1 underwent tandem chlorination/oxidation/Wittig olefination sequence with the activated alcohol 2, to afford (Z)-alpha-chloro-alpha, beta-unsaturated esters in moderate to good yields.