Radical cascade cyclization of β,γ-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 β,γ-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.

中文翻译：

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β,γ-不饱和腙/肟的自由基级联反应

β,γ-不饱和腙/肟的自由基级联环化最近已成为构建多种有价值的功能化吡唑啉和异恶唑啉的有效而强大的方案。本综述总结并分类了β,γ-不饱和腙/肟自由基级联环化的三种催化方式；它们分别是过渡金属催化系统、无过渡金属系统和光/电催化系统。通过这些方法，将各种官能团安装在吡唑啉和异恶唑啉骨架上以丰富有机小分子库。