Remote C-H functionalization using radical translocating arylating groups.

Remote C-H functionalization using radical translocating arylating groups.
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DOI:
10.1038/s41467-018-05193-6
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发表时间:
2018-07-18
影响因子:
16.6
通讯作者:
Studer A
Studer A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Friese FW;Mück-Lichtenfeld C;Studer A

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在未活化的C(sp3)−H键上的位点选择性化学功能化是非常具有挑战性的,最近成功的研究主要集中在过渡金属催化与导向基团的结合上。自由基化学提供了一种互补的方法,巴顿和Hofmann-Löffler-Freytag反应在非活化脂肪族位点的远程C - H功能化领域具有里程碑意义。在这里,我们介绍了自由基易位芳基化的概念,在非活化的二级和三级C(sp3)−H键在各种醇。直接的两步序列包括离子醇磺酰化与特别设计的邻碘芳基磺酰氯,然后是自由基级联反应,包括芳基自由基生成,远程自由基移位,芳基迁移,还原和SO2挤出,以得到相应的γ-芳基化醇。得到了中等至良好的产率,远端C - H基化反应具有良好的区域选择性,并且对于二级C(sp3) - H键具有良好的立体选择性。脂肪族C(sp3)−H键的选择性远程功能化是极具挑战性的,通常需要过渡金属和/或导向基团。在这里,作者通过两步自由基易位和随后的自由基芳基迁移证明了脂肪族醇的γ-芳基化。
Site selective chemical functionalization at unactivated C(sp3)−H bonds is highly challenging and recent successful studies mostly focus on the use of transition metal catalysis in combination with directing groups. Radical chemistry offers a complementary approach with the Barton and the Hofmann-Löffler-Freytag reactions being landmark contributions in the area of remote C−H functionalization at unactivated aliphatic sites. Herein we introduce the concept of radical translocation arylation at unactivated secondary and tertiary C(sp3)−H bonds in various alcohols. The straightforward two-step sequence comprises an ionic alcohol sulfonylation with especially designed ortho-iodoaryl sulfonyl chlorides followed by a radical cascade reaction including aryl radical generation, remote radical translocation, aryl migration, reduction, and SO2 extrusion to give the corresponding γ-arylated alcohols. Moderate to good yields are obtained, remote C−H arylation occurs with excellent regioselectivity and for secondary C(sp3)−H bonds good to excellent stereoselectivity is achieved. Selective remote functionalization of aliphatic C(sp3)−H bonds is highly challenging and often requires transition metals and/or directing groups. Here, the authors show the γ-arylation of aliphatic alcohols via a two-step radical translocation and subsequent radical aryl migration.
在未激活的SP(3)C-H键处,酰胺导向的光电毒素催化的C-C键形成。
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