Synthesis of halogenated 4-quinolones and evaluation of their antiplasmodial activity
摘要:
Treatment of 4-hydroxyquinolines with (2-methyl) allyl bromide in the presence of K2CO3 resulted in the formation of novel N-[(2-methyl) allyl]-4-quinolones through selective N-alkylation. Further reaction of N-(2-methylallyl)-4-quinolones with bromine or N-bromosuccinimide yielded the corresponding 3-bromo- 1-(2,3-dibromo-2-methylpropyl)-4-quinolones and 3-bromo-1-(2-methylallyl)-4-quinolones, respectively. Furthermore, a copper-catalyzed C-N coupling of the latter 3-bromo-4-quinolones with (5-chloro) indole afforded novel 3-[(5-chloro) indol-1-yl]-4-quinolone hybrids. Antifungal and antiplasmodial assays of all new 4-quinolones were performed and revealed no antifungal properties but moderate antiplasmodial activities. All 15 compounds displayed micromolar activities against a chloroquine- sensitive strain of Plasmodium falciparum, and the five most potent compounds also showed micromolar activities against a chloroquine-resistant strain of P. falciparum with IC50-values ranging between 4 and 70 mu M. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of halogenated 4-quinolones and evaluation of their antiplasmodial activity
摘要:
Treatment of 4-hydroxyquinolines with (2-methyl) allyl bromide in the presence of K2CO3 resulted in the formation of novel N-[(2-methyl) allyl]-4-quinolones through selective N-alkylation. Further reaction of N-(2-methylallyl)-4-quinolones with bromine or N-bromosuccinimide yielded the corresponding 3-bromo- 1-(2,3-dibromo-2-methylpropyl)-4-quinolones and 3-bromo-1-(2-methylallyl)-4-quinolones, respectively. Furthermore, a copper-catalyzed C-N coupling of the latter 3-bromo-4-quinolones with (5-chloro) indole afforded novel 3-[(5-chloro) indol-1-yl]-4-quinolone hybrids. Antifungal and antiplasmodial assays of all new 4-quinolones were performed and revealed no antifungal properties but moderate antiplasmodial activities. All 15 compounds displayed micromolar activities against a chloroquine- sensitive strain of Plasmodium falciparum, and the five most potent compounds also showed micromolar activities against a chloroquine-resistant strain of P. falciparum with IC50-values ranging between 4 and 70 mu M. (C) 2013 Elsevier Ltd. All rights reserved.
Synergistic Organoboron/Palladium Catalysis for Regioselective N-Allylation of 2-Pyridones, 4-Pyridones, and Related Ambident Heterocycles
作者:Mark S. Taylor、Giorgos Yatzoglou、Matthew T. Zambri、Shrey P. Desai
DOI:10.1055/s-0043-1763618
日期:2024.5
The use of a boronic acid co-catalyst along with a palladium complex enables efficient dehydrative couplings of allylic alcohols and tautomerizable heterocycles. The protocol has been applied to achieve N-allylations of 2-pyridones, 4-pyridones, 4-pyrimidinones, and their benzofused derivatives.
Direct Synthesis of N‐Alkyl‐2‐Pyridones Using 2‐Halogenated Pyridines
作者:Xia Chen、Jianyi Shi、Yuqun Lin、Yibiao Li、Shaohua Jiang、Tianxiang Chen、Zhongzhi Zhu、Aijun Ma
DOI:10.1002/ejoc.202301184
日期:2024.2.12
This study presents a method for synthesizing pyridine, quinoline, and isoquinoline ketones from 2-halogenated N-heterocycles under mild conditions. The use of H2O as both solvent and oxygen source makes the reaction environmentally friendly, with broad substrate applicability and high functional group tolerance.
Synthesis of halogenated 4-quinolones and evaluation of their antiplasmodial activity
作者:Stéphanie Vandekerckhove、Tom Desmet、Hai Giang Tran、Carmen de Kock、Peter J. Smith、Kelly Chibale、Matthias D’hooghe
DOI:10.1016/j.bmcl.2013.12.067
日期:2014.2
Treatment of 4-hydroxyquinolines with (2-methyl) allyl bromide in the presence of K2CO3 resulted in the formation of novel N-[(2-methyl) allyl]-4-quinolones through selective N-alkylation. Further reaction of N-(2-methylallyl)-4-quinolones with bromine or N-bromosuccinimide yielded the corresponding 3-bromo- 1-(2,3-dibromo-2-methylpropyl)-4-quinolones and 3-bromo-1-(2-methylallyl)-4-quinolones, respectively. Furthermore, a copper-catalyzed C-N coupling of the latter 3-bromo-4-quinolones with (5-chloro) indole afforded novel 3-[(5-chloro) indol-1-yl]-4-quinolone hybrids. Antifungal and antiplasmodial assays of all new 4-quinolones were performed and revealed no antifungal properties but moderate antiplasmodial activities. All 15 compounds displayed micromolar activities against a chloroquine- sensitive strain of Plasmodium falciparum, and the five most potent compounds also showed micromolar activities against a chloroquine-resistant strain of P. falciparum with IC50-values ranging between 4 and 70 mu M. (C) 2013 Elsevier Ltd. All rights reserved.