A metal-free multi-component sulfur dioxide insertion reaction of alkynes, sodium metabisulfite, aryldiazonium, and quinoxalin-2-ones has been developed under visible-light photoredox-catalysis. This photocatalytic tandem reaction would be conducted at room temperature by using of Rhodamine 6G as organic photocatalyst and sodium metabisulfite as the SO₂ surrogate. This protocol provides a synthetic strategy for the construction of various quinoxalin-2-one-containing vinyl sulfones with favourable functional group tolerance, in which one C−C bond and two C−S bonds were constructed in one pot procedure.

中文翻译：

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无金属多组分二氧化硫插入反应在可见光光氧化还原催化下产生含有喹喔啉-2-一的乙烯基砜

在可见光光氧化还原催化下开发了炔烃、焦亚硫酸钠、芳基重氮和喹喔啉-2-酮的无金属多组分二氧化硫插入反应。该光催化串联反应将在室温下通过使用罗丹明 6G 作为有机光催化剂和焦亚硫酸钠作为 SO ₂替代物进行。该协议为构建具有良好官能团耐受性的各种含喹喔啉-2-one 的乙烯基砜提供了一种合成策略，其中一个 C-C 键和两个 C-S 键是在一锅程序中构建的。