the utilization of light energy for the activation of organic substrates. Here, we demonstrate the catalytic application of ligand-to-metal charge-transfer (LMCT) excitation of cerium alkoxide complexes for the facile activation of alkanes utilizing abundant and inexpensive cerium trichloride as the catalyst. As demonstrated by cerium-catalyzed C-H amination and alkylation of hydrocarbons, this reaction
Control of Site-Selectivity in Hydrogen Atom Transfer by Electrostatic Interaction: Proximal-Selective C(sp<sup>3</sup>)–H Alkylation of 2-Methylanilinium Salts Using a Decatungstate Photocatalyst
作者:Jialin Zeng、Takeru Torigoe、Yoichiro Kuninobu
DOI:10.1021/acscatal.2c00278
日期:2022.3.4
C(sp3)–H alkylation of 2-methylanilinium saltsvia radical intermediates was developed. The anionic decatungstate photocatalyst ([W10O32]4–) interacts with the ammonium group of the substrate through electrostatic interaction and selectively abstracts a hydrogen atom from the proximal benzylic carbon atom under UV irradiation. A variety of 2-methylanilinium salts reacted with electron-deficient alkenes
开发了通过自由基中间体对 2-甲基苯胺盐进行位点选择性 C(sp 3 )-H 烷基化。阴离子十钨酸盐光催化剂([W 10 O 32 ] 4-)通过静电相互作用与底物的铵基相互作用,并在紫外线照射下选择性地从近端苄基碳原子中提取一个氢原子。多种 2-甲基苯胺盐与缺电子烯烃反应。烷基化产物通过 C-N 键的断裂成功地转化为芳基碘化物,并通过分子内环化成功地转化为四氢苯并氮杂酮衍生物。机理研究清楚地表明 [W 10 O 32 ] 4–和铵基。
A Broadly Applicable Diels–Alder-Based Synthesis of Ketamine-Related Arylcyclohexylamines
作者:Henrik Weber、Nils Drouvé、Lana Kortenbrede、Sherif El Sheikh
DOI:10.1021/acs.joc.3c01226
日期:2023.8.4
counterparts, a wide range of substituted arylcyclohexylamines was obtained after several modification steps of the initial Diels–Alder products [El Sheikh, S.; Weber, H.; Kortenbrede, L.; Drouvé, N. A broadlyapplicable Diels–Alder based Synthesis of Ketamine related Arylcyclohexylamines. ChemRxiv 2022, 10.26434/chemrxiv- 2022-xf1l9].
Divergent Functionalization of Styrenes via Radical/Polar Crossover with CO
<sub>2</sub>
and Sodium Sulfinates
作者:Kimberly Benedetti Vega、José Antonio Campos Delgado、Lucas V. B. L. Pugnal、Burkhard König、José Tiago Menezes Correia、Márcio Weber Paixão
DOI:10.1002/chem.202203625
日期:——
tunable multicomponent reaction which involves CO2, sodium sulfinates and styrenes to access both β-sulfonylateds carboxylic acids through radical–polar crossover process and to α-substituted acrylates through sequential sulfonyl radical addition/coupling/elimination process. This setup exhibits excellent tolerance to different functional groups and its application towards biologically relevant molecules
不那么激进:自由基化学与极性化学的结合用于开发可调谐的多组分反应,该反应涉及 CO 2、亚磺酸钠和苯乙烯,通过自由基-极性交叉过程获得 β-磺酰化羧酸,并通过 α-取代丙烯酸酯连续的磺酰基加成/偶联/消除过程。该设置对不同的官能团表现出极好的耐受性,其在生物学相关分子和产品多样化方面的应用有助于该方法的综合效用。