Direct Cα-heteroarylation of structurally diverse ethers via a mild N-hydroxysuccinimide mediated cross-dehydrogenative coupling reaction.

Direct Cα-heteroarylation of structurally diverse ethers via a mild N-hydroxysuccinimide mediated cross-dehydrogenative coupling reaction.
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通过温和的 N-羟基琥珀酰亚胺介导的交叉脱氢偶联反应对结构多样的醚进行直接 C α 杂芳基化

DOI:
10.1039/c6sc05697k
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发表时间:
2017-05-01
期刊:
影响因子:
8.4
通讯作者:
Wang W
Wang W
中科院分区:
化学1区
文献类型:
--
作者:
Liu S;Liu A;Zhang Y;Wang W

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开发了一种新的、高效的N-羟基丁二酰亚胺介导的、温和的、不含金属的用于不同醚类的C-α-异芳基化反应的CDC策略。在醚的C-α-异芳基化反应中,一个重要的挑战是需要大量过量的醚(在许多情况下用作溶剂)才能实现有效的转化。这一缺点大大限制了乙醚的C-α-异芳基化反应,使其只能使用简单易得的乙醚底物。为了克服这一限制,开发了一种新的、高效的、N-羟基琥珀酰亚胺介导的、温和的、不含金属的、用于不同醚的直接C-α-异芳基化反应的CDC策略。与我们以前的苯甲醛介导的光氧化还原C-α-异芳基化不同,我们发现了一种新的、不需要用光的高效介体。首次揭示了一种独特的非光氧化还原参与的氢原子转移(HAT)机制,该机制使用了NHS产生的氮中心自由基阳离子。值得注意的是,只使用5-10当量的醚作为偶联伙伴,这允许结构多样和复杂的醚参与这一过程,以生成具有高度药用意义的C-α-杂芳基醚。此外,更多结构多样的杂环化合物可以作为这一过程的反应物。
A new, efficient, N-hydroxysuccinimide (NHS) mediated, mild and metal-free CDC strategy for the direct Cα-heteroarylation of diverse ethers has been developed. An important challenge in the Cα-heteroarylation of ethers is the requirement of a large excess amount of ethers (that are used as solvents in many cases) to achieve effective transformations. This drawback has significantly restricted the Cα-heteroarylation of ethers to the use of simple and easily accessible ether substrates. To overcome this limitation, a new, efficient, N-hydroxysuccinimide (NHS) mediated, mild and metal-free CDC strategy for the direct Cα-heteroarylation of diverse ethers has been developed. Different to our previous benzaldehyde mediated photoredox Cα-heteroarylation, we have identified NHS as a new and efficient mediator without using light. A distinct non-photoredox engaged hydrogen-atom-transfer (HAT) mechanism that used a nitrogen-centered radical cation produced from NHS is initially revealed. Notably, only 5–10 equivalents of ethers as coupling partners are used, which allows for structurally diverse and complex ethers to engage in this process, to create highly medicinally relevant Cα-heteroarylated ethers. Furthermore, more structurally diverse heterocyclics can serve as reactants for this process.
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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