Abstract The manuscript pertains to the synthesis and in vitro cytotoxic evaluation of a series of N-alkylbromo and N-alkylphthalimido-isatins against four different human cancer cell lines namely Colon: HCT-15; Liver: Hep-2; Lung: A-549 and Leukemia: THP-1 at 10 and 100 μM concentrations. The active compounds based on preliminary studies were evaluated for their IC 50 value against six cell lines viz. Colo-205, HCT-15 (Colon), THP-1 (Leukemia), A-549 ...