Nickel-Catalyzed Decarboxylative Alkylation of Aryl Iodides with Anhydrides,ACS Catalysis

当前位置： X-MOL 学术 › ACS Catal. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Nickel-Catalyzed Decarboxylative Alkylation of Aryl Iodides with Anhydrides
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-10-11 00:00:00 , DOI: 10.1021/acscatal.8b03396
Hui Chen ₁ , Lu Hu ₁ , Wenzhi Ji ₁ , Licheng Yao ₁ , Xuebin Liao ₁

Affiliation

We present the anhydride-based decarboxylative alkylation of aryl iodides catalyzed by nickel. This method of decarboxylative coupling works with a broad scope of aliphatic carboxylic anhydrides and tolerates synthetically useful aromatic substituents. Assisted by a redox system of pyridine N-oxide and zinc additives, the current reaction occurs under mild conditions and without the assistance of photocatalyst. Notably, this method features high chemoselectivity toward alkyl migration with mixed aliphatic/aromatic anhydrides. Thus, it provides a powerful synthetic tool to modify high-valued aliphatic carboxylic acids by converting them into mixed anhydrides using readily available aryl carboxylic acids such as p-toluic acid. We propose a catalytic cycle that involves the key steps of free radical-based decarboxylation and subsequent alkyl transfer to nickel that precedes an oxidatively induced C–C reductive elimination from Ni(III).

中文翻译：

镍催化芳基碘化物与酸酐的脱羧烷基化

我们提出了镍催化的芳基碘化物的基于酸酐的脱羧烷基化。这种脱羧偶联的方法可与多种脂族羧酸酐一起使用，并能耐受合成上有用的芳族取代基。在吡啶N-氧化物和锌添加剂的氧化还原系统的辅助下，当前反应在温和条件下进行，无需光催化剂的帮助。值得注意的是，该方法具有混合脂肪族/芳香族酸酐对烷基迁移的高化学选择性。因此，它提供了一种强大的合成工具，可以通过使用容易获得的芳基羧酸（例如对羟基苯甲酸）将高价脂肪族羧酸转化为混合酸酐来改性高价值脂肪族羧酸-甲苯甲酸。我们提出了一个催化循环，该循环涉及基于自由基的脱羧反应以及随后的烷基转移至镍的关键步骤，该过程先于Ni（III）的氧化诱导的C–C还原消除。

更新日期：2018-10-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11