Sulfur containing spiroheterocyclic oxindoles are promising privileged scaffolds in medicinal chemistry and drug discovery. Previously, we identified a new class of spirodihydrothiopyran-oxindoles with good in vitro antitumoractivity against A549lungcancercellline. Herein, various spirooxindole-dihydrothiopyrans with diverse substitutions were synthesized and assayed to investigate the structure-activity