Copper-Catalyzed One-Pot <i>N</i>-Acylation and C5–H Halogenation of 8-Aminoquinolines: The Dual Role of Acyl Halides
作者:Yi Du、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.8b00068
日期:2018.3.16
The synthesis of N-acyl-5-halo-8-aminoquinolines has been realized by directly employing 8-aminoquinolines and acyl halides (Cl, Br, I) with copper catalysis. The construction of the target products involves domino N-acylation and C5–H halogenations of the 8-aminoquinoline, wherein the acyl halides act as the donors of both acyl and halide atoms, which enables the first access to the step efficient
Transition Metal‐Controlled Direct Regioselective Intermolecular Amidation of C−H Bonds with Azodicarboxylates: Scope, Mechanistic Studies, and Applications
A simple and efficient transition metal‐catalyzed C−Hamidation with azodicarboxylates has been developed. Under silver catalysis, the amide substrates undergo regioselective C−Hamidation at C5‐position of the quinoline. Conversely, with palladium as the catalyst, the reaction gave β‐C(sp3)−H amidation products via the activation of methylene C(sp3)−H bonds. Mechanistic studies suggested that the
An efficient and convenient method for remote C5 halogenation of 8-aminoquinoline derivatives was developed in continuous flow at room temperature. This method employed inexpensive 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) and 1,3-dichlro-5,5-dimethylhydantoin (DCDMH) as halogenation reagents and visible light to catalyze the reaction. The reaction is scalable to gram-scale and proceeded with air and moisture tolerance, good functional group compatibility, and outstanding site selectivity, providing a new pathway for C5 halogenation of 8-aminoquinolines. (C) 2019 Published by Elsevier Ltd.