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Updated: Aug 12, 2026

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
Catalyst-free synthesis of chromeno-furo-pyridinones via intramolecular [4 + 2] cycloaddition
Ashutosh Dey1, Vikash Kumar1, Megha Kumari1
1Department of Chemistry, Central University of South Bihar, SH-7, Gaya Panchanpur Road, Karhara, Gaya-824236, Bihar, India. k.mahender666@gmail.com.
Abstract:
A step-economical, catalyst-free intramolecular Diels-Alder strategy has been developed for the synthesis of previously unexplored polycyclic chromeno-furo-pyridinones. The transformation proceeds via in situ imine formation, followed by a thermally driven [4 + 2]-cycloaddition with the tethered alkyne and subsequent aromatization, in a single operational step. This cascade process constructs two heterocyclic rings and three new bonds (two C-C bonds and one C-N bond), with water as the sole stoichiometric byproduct. This protocol features a broad substrate scope, high functional group tolerance, and excellent step economy, furnishing diverse functionalized chromeno-furo-pyridinones in good to excellent yields. The resulting polycyclic scaffolds represent versatile synthetic intermediates for further derivatization, providing access to structurally complex and molecularly diverse heterocyclic architectures.
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