By‐Product‐Catalyzed Redox‐Neutral Sulfenylation/Deiodination/Aromatization of Cyclic Alkenyl Iodides with Sulfonyl Hydrazides,Advanced Synthesis & Catalysis

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By‐Product‐Catalyzed Redox‐Neutral Sulfenylation/Deiodination/Aromatization of Cyclic Alkenyl Iodides with Sulfonyl Hydrazides
Advanced Synthesis & Catalysis ( IF 4.4 ) Pub Date : 2016-10-04 , DOI: 10.1002/adsc.201600795
Fu-Lai Yang ₁ , Yang Gui ₁ , Bang-Kui Yu ₁ , You-Xiang Jin ₁ , Shi-Kai Tian ₁

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A by‐product‐catalyzed redox‐neutral process has been established through tandem sulfenylation/deiodination/aromatization of cyclic alkenyl iodides with sulfonyl hydrazides. In the absence of external catalysts and additives a range of 4‐iodo‐1,2‐dihydronaphthalenes reacted with sulfonyl hydrazides to give structurally diverse 2‐naphthyl thioethers in good yields. Mechanistic studies showed that at an early stage sulfonyl hydrazides decomposed completely to thiosulfonates and disulfides and at a late stage the resulting thiosulfonates underwent tandem sulfenylation/deiodination/aromatization with 4‐iodo‐1,2‐dihydronaphthalenes involving a [1,5]‐sigmatropic hydrogen shift. Importantly, iodine was generated as a by‐product from 4‐iodo‐1,2‐dihydronaphthalenes upon heating and served as a catalyst for the decomposition of sulfonyl hydrazides and subsequent formation of 2‐naphthyl thioethers.

中文翻译：

副产物催化的环烯碘化物与磺酰肼的氧化还原-中性亚磺酰基化/去碘化/芳构化

通过环烯基碘化物与磺酰肼的串联磺酰基化/去碘化/芳构化，建立了副产物催化的氧化还原中性过程。在没有外部催化剂和添加剂的情况下，各种4-碘1,2-二氢萘与磺酰肼反应生成了结构多样的2-萘硫醚，收率很高。机理研究表明，磺酰肼在早期阶段会完全分解为硫代磺酸盐和二硫化物，而到了后期，所得的硫代磺酸盐会被含有[1,5] -sigmatropic的4-碘-2-1,2-二氢萘进行串联磺基化/去碘化/芳构化。氢转移。重要的是，碘是4碘1的副产物，

更新日期：2016-10-04

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