Ring-opening of epoxides furnishing either linear or branched products belongs to the group of classic transformations in organic synthesis. However, the regioselective cross-electrophile coupling of aryl epoxides with aryl halides still represents a key challenge. Herein, we report that the vitamin B12/Ni dual-catalytic system allows for the selective synthesis of linear products under blue-light
提供线性或支化产物的环氧化物的开环属于有机合成中的经典转化组。然而,芳基环氧化物与芳基卤化物的区域选择性交叉亲电偶联仍然是一个关键挑战。在此,我们报告了维生素 B 12 /Ni 双催化系统允许在蓝光照射下选择性合成线性产物,从而补充获得支化醇的方法。实验和理论研究证实了所提出的涉及烷基钴胺素作为该反应中间体的机制。
作者:Hongyu Wang、Zhihui Wang、Guo Zhao、Velayudham Ramadoss、Lifang Tian、Yahui Wang
DOI:10.1021/acs.orglett.2c01286
日期:2022.5.27
bond formation reaction is achieved through electrochemical reduction of alcoholic phosphates or sulfonates with aldehydes or ketones. Alcohol derivatives of phosphates undergo single-electron reduction under electrochemical conditions followed by a spontaneous cleavage of the C–O bond with the exothermic loss of phosphate resulting in an alkyl radical species. Subsequently, radical intermediates are further
Photoredox-Driven Three-Component Coupling of Aryl Halides, Olefins, and O<sub>2</sub>
作者:Mark C. Maust、Simon B. Blakey
DOI:10.1021/acscatal.3c05988
日期:2024.2.16
hydroxyarylation reaction that utilizes aryl halides, olefins, and O2 as the reaction components. Crucial to this advance was an oxidative, rather than a reductive, approach to aryl radical generation, which enables reaction tolerance to O2. This methodology displays a broad functional group tolerance with a variety of functionalized aryl halides and a broad array of olefins. Development of this methodology enables
现代有机合成需要以温和有效的方式将丰富的原料化学品结合在一起的方法。为了帮助实现这一目标,我们开发了一种多组分自由基羟基芳基化反应,该反应利用芳基卤、烯烃和O 2作为反应组分。这一进展的关键是芳基自由基生成的氧化而非还原方法,这使得反应能够耐受 O 2 。该方法显示出对各种官能化芳基卤化物和多种烯烃的广泛官能团耐受性。该方法的开发使得能够从简单的市售起始材料快速获得生物相关的羟基芳基产品。
Fialkov,Yu.A. et al., Journal of Organic Chemistry USSR (English Translation), 1970, vol. 6, p. 2091 - 2095
作者:Fialkov,Yu.A. et al.
DOI:——
日期:——
Regioselectivity of the Rhodium-Catalyzed Hydroboration of Vinyl Arenes: Electronic Twists and Mechanistic Shifts
作者:David R. Edwards、Yonek B. Hleba、Christopher J. Lata、Larry A. Calhoun、Cathleen M. Crudden