Rapid Access to Amino-Substituted Quinoline, (Di)Benzofuran, and Carbazole Heterocycles through an Aminobenzannulation Reaction
作者:Martin Tiano、Philippe Belmont
DOI:10.1021/jo800249f
日期:2008.6.1
quinolines, dibenzofurans, and carbazoles. The precursors are heterocycles bearing a methyl ketone group ortho to an internal alkyne. They are commercially available or can be obtained in three to four classical and efficient reactions: Vilsmeier−Haack, Sonogashira (diversity point), Grignard, and Ley’s oxidation. Upon aminobenzannulation reaction—classical conditions being pyrrolidine neat or in a solvent
Nickel‐Catalyzed Amination of (Hetero)aryl Halides Facilitated by a Catalytic Pyridinium Additive
作者:Dongyang Han、Sasa Li、Siqi Xia、Mincong Su、Jian Jin
DOI:10.1002/chem.202002800
日期:2020.9.25
An efficient and operationally simple Ni‐catalyzed amination protocol has been developed. This methodology features a simple NiII salt, an organic base and catalytic amounts of both a pyridinium additive and Zn metal. A diverse number of (hetero)aryl halides were coupled successfully with primary and secondary alkyl amines, and anilines in good to excellent yields. Similarly, benzophenone imine gave
Visible Light-Mediated (Hetero)aryl Amination Using Ni(II) Salts and Photoredox Catalysis in Flow: A Synthesis of Tetracaine
作者:Boyoung Y. Park、Michael T. Pirnot、Stephen L. Buchwald
DOI:10.1021/acs.joc.9b03107
日期:2020.3.6
We report a visiblelight-mediated flow process for C-N cross-coupling of (hetero)aryl halides with a variety of amine coupling partners through the use of a photoredox/nickel dual catalyst system. Compared to the method in batch, this flow process enables a broader substrate scope, including less-activated (hetero)aryl bromides and electron-deficient (hetero)aryl chlorides, and significantly reduced