Synthesis of new arylisoxazole-oxindole conjugates as potent antiproliferative agents

A new series of arylisoxazole-oxindole derivatives (6a-r) were synthesized and evaluated for their antiproliferative activity against human cancer cell lines including non-small cell lung (A549), cervical (HeLa), breast (MCF-7), and prostate (DU-145) cancer cell lines. The synthesized compounds (6a-r) demonstrated excellent to moderate cytotoxicity with IC50 values ranging from 0.82 to 3.69 mu m. Some new compounds (6m-r) exhibited profound cytotoxicity better or similar to positive control. More particularly, the compound 6q possesses donating substituent like methoxy group presented at 5-position on D ring exhibited remarkable antiproliferative activity against A-549 (lung cancer) with an IC50 value 0.82 mu m. Further studies to determine the mechanistic aspects of these conjugates are under progress.