Directcatalyticasymmetricconjugateaddition of thiolactams to α,β-unsaturatedthioamides was efficiently promoted by a soft Lewis acid/hard Brønsted base cooperative catalyst in a highly stereocontrolled manner. Thioamide functionality was crucial to promote both the efficient enolization of thiolactam pronucleophiles and the subsequent stereoselective conjugateaddition to α,β-unsaturated thioamides