Synthesis and Biological Activities of Some Novel Spiro Heterocyclic Pyrrolizidine Derivatives of 11H-indeno[1,2-b]quinoxaline through 1,3-Dipolar Cycloaddition

Abstract

The synthesis of spiropyrrolidines by the Knoevenagel condensation has been reported as highly bioactive natural and synthetic organic products. The synthesis was initiated by Knoevenagel condensation of indole-2-one with an appropriate benzaldehyde in presence of L-proline to afford spiropyrrolidines. Herein, a design and pathway of syntheses of a library of spiropyrrolidines bearing spiro heterocyclic indeno[1,2-b]quinoxaline-11-one motifs were reported, which also demonstrated an exceptional inhibitory activity against the anticancer cells. A novel series of dispiroindenoquinoxaline pyrrolizidines were synthesized by the condensation of indeno[1,2-b]quinoxalin-11-one and starting material (a product of ninhydrin and aldehyde derivatives). The structure of the synthesized compounds was established by spectral data.