Intramolecular Addition of a Dimethylamino C(sp3)–H Bond across C–C Triple Bonds Using IrCl(DTBM-SEGPHOS)(ethylene) Catalyst: Synthesis of Indoles from 2-Alkynyl-N-methylanilines
作者:Toshimichi Ohmura、Michinori Suginome、Kaito Yagi、Takeru Torigoe
DOI:10.1055/a-1511-1025
日期:2021.9
Intramolecular addition of a C(sp3)–H bond of the dimethylamino group across the C–C triple bond in 2-alkynyl-N,N-dimethylanilines is effectively catalyzed by a new iridium complex, IrCl(DTBM-SEGPHOS)(C2H4), in mesitylene at 150 °C. The intramolecular C(sp3)–H addition is followed by double-bond isomerization to afford 3-substituted indoles in good to high yields.
新型铱络合物 IrCl(DTBM-SEGPHOS)(C2H4) 有效催化了 2-炔基-N,N-二甲基苯胺中 C-C 三键上二甲氨基的 C(sp3)-H 键的分子内加成, 在 150 °C 的均三甲苯中。分子内 C(sp3)–H 加成之后进行双键异构化,以良好或高产率得到 3-取代的吲哚。