approach for the stereocontrolledconstruction of the 3,4-dihydrothiacarbazol-2(9H)-oneskeleton has been developed. In the presence of a bifunctional squaramide catalyst that was derived from L-tert-leucine, the asymmetric tandem Michael/thiolysis reactions of 9-methylindoline-2-thiones and N-alkynoylphthalimides proceeded efficiently to furnish the desired 3,4-dihydrothiacarbazol-2(9H)-one derivatives