General and Mild Cobalt-Catalyzed C-Alkylation of Unactivated Amides and Esters with Alcohols,Journal of the American Chemical Society

当前位置： X-MOL 学术 › J. Am. Chem. Soc. › 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.)

General and Mild Cobalt-Catalyzed C-Alkylation of Unactivated Amides and Esters with Alcohols
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2016-08-16 , DOI: 10.1021/jacs.6b06448
Nicklas Deibl ₁ , Rhett Kempe ₁

Affiliation

The borrowing hydrogen or hydrogen autotransfer methodology is an elegant and sustainable or green concept to construct carbon-carbon bonds. In this concept, alcohols, which can be obtained from barely used and indigestible biomass, such as lignocellulose, are employed as alkylating reagents. An especially challenging alkylation is that of unactivated esters and amides. Only noble metal catalysts based on iridium and ruthenium have been used to accomplish these reactions. Herein, we report on the first base metal-catalyzed α-alkylation of unactivated amides and esters by alcohols. Cobalt complexes stabilized with pincer ligands, recently developed in our laboratory, catalyze these reactions very efficiently. The precatalysts can be synthesized easily from commercially available starting materials on a multigram scale and are self-activating under the basic reaction conditions. This Co catalyst class is also able to mediate alkylation reactions of both esters and amides. In addition, we apply the methodology to synthesize ketones and to convert alcohols into aldehydes elongated by two carbon atoms.

中文翻译：

未活化酰胺和酯与醇的一般和温和钴催化的 C-烷基化

借用氢或氢自动转移方法是构建碳-碳键的优雅且可持续或绿色的概念。在这个概念中，可以从几乎不使用且难以消化的生物质（例如木质纤维素）中获得的醇被用作烷基化试剂。一个特别具有挑战性的烷基化是未活化的酯和酰胺。仅使用基于铱和钌的贵金属催化剂来完成这些反应。在此，我们报告了醇对未活化酰胺和酯的第一个贱金属催化的 α-烷基化反应。我们实验室最近开发的钳形配体稳定的钴配合物可以非常有效地催化这些反应。预催化剂可以很容易地从市售的起始材料以多克规模合成，并且在碱性反应条件下自活化。这种 Co 催化剂类别还能够介导酯和酰胺的烷基化反应。此外，我们应用该方法合成酮并将醇转化为由两个碳原子拉长的醛。

更新日期：2016-08-16

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南