A new and efficient oxo-sulfonylation protocol has been established for the synthesis of N-sulfonylated indazolones employing sulfinic acid as a sulfonylating agent using tert-butyl hydroperoxide (TBHP) under ambient air. A series of structurally diverse 1-sulfonylindazol-3(2H)-one derivatives were obtained in good yields. A radical reaction mechanism has been proposed for this transformation.

中文翻译：

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叔丁基过氧化氢介导的2H-吲唑与亚磺酸向Indazol-3（2H）-ones的羰基磺化反应。

已经建立了一种新的有效的羰基磺酰化方案，用于在环境空气下，使用亚硫酸作为过磺化剂，使用氢过氧化叔丁基（TBHP）来合成N-磺酰化的吲唑酮。以高收率获得了一系列结构上不同的1-磺酰吲哚-3（2H）-一衍生物。已经提出了用于该转化的自由基反应机理。