Asymmetric induction in the addition of thioacetic S‐acid to α,β‐unsaturated esters

Abstract
2‐Methylpropenoates and cis‐ or trans‐butenedioates add thioacetic S‐acid under conditions of asymmetric catalysis by cinchona alkaloids to give optically active thioacetates. Structural factors influencing the stereochemical outcome of the reaction are discussed.