Novel efficient synthesis of dibromoalkenes. A first example of catalytic olefination of aliphatic carbonyl compounds
作者:Vasily N. Korotchenko、Alexey V. Shastin、Valentine G. Nenajdenko、Elizabeth S. Balenkova
DOI:10.1039/b303221c
日期:——
A new simple and efficient one pot transformation of various aliphatic carbonyl compounds to the corresponding dibromoalkenes is described. A wide range of hydrazones of aldehydes and ketones, prepared in situ, were easily converted into dibromoalkenes by treatment with carbon tetrabromide in the presence of CuCl. The reaction proceeds under mild conditions to give the target products in good to high yields.
Electrochemical Fluorination of Vinyl Boronates through Donor‐Stabilized Vinyl Carbocation Intermediates**
作者:Benjamin Wigman、Woojin Lee、Wenjing Wei、Kendall N. Houk、Hosea M. Nelson
DOI:10.1002/anie.202113972
日期:2022.3.14
Vinyl carbocations were generated via single-electron oxidation of alkenyl boronates using electrical potentials. This electrochemical process enabled the formation of these reactive species without the use of Lewis or Brønsted acids. The intermediate vinyl carbocations were trapped with nucleophilic fluoride sources to yield vinyl fluorides; the production of new C−C, C−Cl, and C−Br bonds was also
乙烯基碳阳离子是通过使用电位对烯基硼酸盐进行单电子氧化而产生的。这种电化学过程能够在不使用 Lewis 或 Brønsted 酸的情况下形成这些反应性物质。中间乙烯基碳阳离子被亲核氟化物源捕获以产生氟乙烯;还证明了新的 C-C、C-Cl 和 C-Br 键的产生。