Regioselective Reactions, Spectroscopic Characterization, and Cytotoxic Evaluation of Spiro-pyrrolidine Thiophene

Spiro-oxo-indole/pyrrolidine-thiophene base possessed significant pharmacological activity. The [3+2] cycloaddition reactions of thia-methine ylide respected through multi-component reaction affording regioselective and stereoselective spiroindoline-3,2-tetrahydrothiophene derivative 3. Reaction of such compound with different electrophilic and nucleophilic reagents afforded bioactive heterocyclic compounds 4-16. Biological evaluation showed that these synthesized spiro-pyrrolidine exhibited moderate to good cytotoxic activity. Among them, compounds 7 and 14 displayed the best cytotoxic activity against MCF-7 and Wl-38 cells with the IC50 values of 7.02 +/- 0.6 and 8.97 +/- 0.9m (very strong), respectively. Compounds 4, 5, and 12 exhibited strong cytotoxicity's with IC50 16.28 +/- 1.7, 11.16 +/- 1.1, and 19.14 +/- 1.7m, respectively, against MCF-7 mammary gland cell line. All compound structures were supported by spectroscopic data and elemental analysis.