Palladium-Catalyzed Tandem Amination Reaction for the Synthesis of 4-Quinolones
摘要:
An efficient palladium-catalyzed tandem amination approach was developed In one step to afford functionalized 4-quinolones In good to excellent yields from easily accessible o-haloaryl acetylenic ketones and primary amines.
Direct Synthesis of 4-Quinolones via Copper-Catalyzed Anilines and Alkynes
作者:Xuefeng Xu、Xu Zhang
DOI:10.1021/acs.orglett.7b02495
日期:2017.9.15
and direct approach for constructing 4-quinolones from simple and readily available anilines and alkynes is described. Under the optimal conditions, both N-alkyl- and N-aryl-substituted anilines can be successfully transformed into the corresponding 4-quinolones. This reaction is characterized by mild reaction conditions, high functional-group tolerance, and amenability to gram-scale synthesis.
The Buchwald–Hartwig coupling/Michael addition sequence has been successfully applied to the synthesis of functionalized 1,2-disubstituted 4-quinolones using Pd(OAc)2 as a catalyst and PPh3 as a ligand. Under these conditions, the intermediate products first formed from chalcones and primaryamines underwent catalytic dehydrogenation to yield the 1,2-disubstituted 4-quinolones.