A series of tetrahydro-β-carboline-isatin conjugates, with varying substituents as well as stereochemistry at C-1 and C-5 position of tetrahydro-β-carboline (THβC) and isatin ring, were prepared and assayed for anti-proliferative efficacy on Estrogen Responsive ER(+) (MCF-7) and ER(-ve) MDA-MB-231 cell-lines. The synthesized scaffolds displayed selective anti-proliferative efficacy against MCF-7 cell-line with the most active conjugate 8b exhibiting an IC50 value of 37.42 μM, comparable to that of peganumine A, a tetrahydro-β-carboline analogue, isolated from Peganum harmala. The synthesized compound 8b was also more potent than the standard drug tamoxifen (IC50 = 50 μM against MCF-7). The observed activities were further corroborated via docking studies in ER-α (PDB ID: 3ERT).
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