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。
HINO, KATSUHIKO;NAGAI, YASUTAKA;UNO, HITOSHI;MASUDA, YOSHINOBU;OKA, MAKOT+, J. MED. CHEM., 31,(1988) N 1, 107-117