The first coupling of α-allenols, sulfur dioxide, and arenediazonium salts is presented. The three-component reaction which is promoted by visible light can be easily accomplished using DABSO as a sulfur dioxide surrogate in the presence of a photoredox catalyst. In this manner, a broad range of electron-rich and electron-deficient aryl substituents are well accommodated in the sulfonylation–rearrangement cascade to afford the 2,2-disubstituted 3-(arylsulfonyl)but-3-enals in reasonable yields. Based on control experiments, a radical mechanism which does imply 1,2-aryl migration has been proposed.

中文翻译：

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α-烯丙醇与重氮盐和二氧化硫的偶合在可见光下Ru催化催化3-（芳基磺酰基）but-3-烯醛的合成

提出了α-烯醇，二氧化硫和槟榔重氮盐的首次偶联。在光氧化还原催化剂的存在下，使用DABSO作为二氧化硫替代物可以轻松完成由可见光促进的三组分反应。以这种方式，在磺酰化-重排级联中可以很好地容纳大量的富电子和缺电子的芳基取代基，从而以合理的收率得到2,2-二取代的3-（芳基磺酰基）but-3-烯醛。基于对照实验，提出了暗示1，2-芳基迁移的自由基机理。