Abstract
A facile eco-friendly approach for the regioand stereoselective synthesis of structurally intriguing novel spiropyrrolidinoquinoxaline tethered indole hybrid heterocycle has been accomplished via a cascade reaction sequence involving 1,3-dipolar cycloaddition as the key step. Structural elucidation of the synthesized spiroheterocycle was performed by NMR spectroscopy, mass spectrometric analysis and the stereochemistry of asymmetric carbons have been confirmed by single crystal X-ray diffraction analysis. The mechanistic rationalization for the formation of spiroheterocyclic hybrid was investigated through density functional theory (DFT) calculations. In addition, the synthesized spiroheterocyclic hybrid was tested for its cholinesterase inhibitory activity against ChEs and displayed good activity when compared to the standard drug galantamine. (C) 2020 Elsevier B.V. All rights reserved.