What question did this study set out to answer?

The aim is to develop a catalyst-free method to synthesize fused bicyclic pyrazolidinones using 1,3-dipolar cycloaddition.

February 19, 2026

1,3‐Dipolar Cycloadditions: Synthesis of Fused Bicyclic Pyrazolidinones Through Azomethine Imine Cycloaddition With Oxabicyclic Alkene

Puntos clave

The aim is to develop a catalyst-free method to synthesize fused bicyclic pyrazolidinones using 1,3-dipolar cycloaddition.
Employed a catalyst-free 1,3-dipolar cycloaddition technique.
Utilized oxabicyclic alkene as a dipolarophile for N,N'-cyclic azomethine imine for the first time.
Analyzed the configuration of products using single-crystal X-ray diffraction.
Successfully synthesized various fused N,N'-bicyclic pyrazolidinone derivatives.
Achieved good yield of products with high diastereoselectivity.

Resumen

ABSTRACT The catalyst‐free 1,3‐dipolar cycloaddition of an oxabicyclic alkene with N,N′‐cyclic azomethine imine has been developed. Various fused N,N′‐bicyclic pyrazolidinone derivatives were conveniently synthesized in good yield with high diastereoselectivity. We utilized an oxabicyclic alkene as a dipolarophile for the first time in the 3 + 2 cycloaddition of N,N′‐cyclic azomethine imine. The relative configuration of the cycloaddition product was determined by single‐crystal X‐ray diffraction analysis.

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