Highly selective and direct electroreductive ring-opening carboxylation of epoxides with CO2 in an undivided cell to yield synthetically important β-hydroxy acids is described. CO2functions not only as a carboxylative reagent in this reaction but also as a promoter to enable efficient and chemoselective transformation of epoxides under additive-free electrochemical conditions.
描述了在未分裂的电池中用 CO 2对环氧化物进行高选择性和直接的还原性开环羧化,以产生合成重要的β-羟基酸。CO 2不仅在该反应中充当羧化试剂,而且还充当促进剂以在无添加剂的电化学条件下实现环氧化物的有效和化学选择性转化。
Electrocarboxylation of Aryl Epoxides with CO
<sub>2</sub>
for the Facile and Selective Synthesis of β‐Hydroxy Acids
A general and efficient method for the electroreductive carboxylation of arylepoxides with CO2 has been developed to provide β-hydroxy acids. The method exhibited broad substrate scope, could be extended to cyclic ethers with larger rings, and proved to be a powerful approach to the late-stage carboxylation of natural product derivatives and drug molecules.
Herein, we report the first visible-lightphotoredox-catalyzedcarboxylation of arylepoxides with CO to synthesize hydroxy acid derivatives. A variety of valuable β-, γ-, δ-, ε‑hydroxy acid derivatives are obtained in moderate to high yields under mild conditions. This protocol shows noteworthy functional-group compatibility, high chemo- and regioselectivities under transition-metal-free conditions
在此,我们报道了第一个可见光光氧化还原催化芳基环氧化物与 CO 的羧化反应来合成羟基酸衍生物。在温和条件下以中等到高产率获得多种有价值的β-、γ-、δ-、ε-羟基酸衍生物。该方案显示出值得注意的官能团相容性,在无过渡金属条件下具有高化学和区域选择性,并使用廉价的有机染料作为光敏剂。机理研究表明,苄基碳负离子是作为顺序单电子转移(SSET)过程的中间产物而产生的。