Radical Cascade Reactions of β,γ-Unsaturated Hydrazones/Oximes

Radical cascade cyclization of beta,gamma-unsaturated hydrazones/oximes has recently emerged as an efficient and powerful protocol for the construction of diverse and valuable functionalized pyrazolines and isoxazolines. In this review, three catalytic ways of radical cascade cyclization of beta,gamma-unsaturated hydrazones/oximes are summarized and classified; these are transition-metal-catalyzed systems, transition-metal-free systems, and photo-/electrocatalytic systems, respectively. Through these methods, various functional groups are installed on the pyrazoline and isoxazoline skeletons to enrich the small organic molecule library.

Automated summary

This review summarizes and classifies three catalytic ways of radical cascade cyclization of beta,gamma-unsaturated hydrazones/oximes: transition-metal-catalyzed systems, transition-metal-free systems, and photo-/electrocatalytic systems. Through these methods, various functional groups are installed on the pyrazoline and isoxazoline skeletons to enrich the small organic molecule library.