Synthesis and biological activities of novel ethers of quinolinone linked with coumarins
作者:Rajesh G. Kalkhambkar、G. Aridoss、Geeta M. Kulkarni、R. M. Bapset、T. Y. Mudaraddi、N. Premkumar、Yeon Tae Jeong
DOI:10.1007/s00706-011-0460-3
日期:2011.3
ethers of quinolinone linked with different substituted coumarins and benzofurans were synthesized from 4-(bromomethyl)quinolinones. All newly synthesized compounds were screened for their in vitro antibacterial and antifungal activities. Most of the compounds with chloro substitution at the C-6 or C-7 position in quinolinone showed potent antibacterial and antifungal activities. In pharmacological evaluations
摘要由4-(溴甲基)喹啉酮合成了一系列与不同取代的香豆素和苯并呋喃连接的喹啉酮新醚。筛选所有新合成的化合物的体外抗菌和抗真菌活性。喹啉酮中大多数在C-6或C-7位置被氯取代的化合物显示出有效的抗菌和抗真菌活性。在药理学评估中,这些氯喹啉酮中的一些在8小时后也显示出70-77%的炎症抑制作用,而其他化合物显示出51-55%的抑制作用。与标准品和对照品相比,大多数化合物显示出有效的镇痛活性。通过元素分析,IR,1 H NMR,13 C NMR和EI-MS对所有新合成化合物的结构进行了表征。 图形概要
Palladium-Catalyzed Synthesis of 4-Arylcoumarins Using Triarylbismuth Compounds as Atom-Efficient Multicoupling Organometallic Nucleophiles
作者:Maddali L. N. Rao、Varadhachari Venkatesh、Deepak N. Jadhav
DOI:10.1002/ejoc.201000134
日期:——
Triarylbismuth compounds have been cross-coupled as atom-efficientmulticoupling organometallic nucleophiles with 4-bromo- and 4-(trifluoromethylsulfonyloxy)coumarins underpalladiumcatalysis conditions. These reactions afforded an array of 4-arylcoumarins in high yields. The general palladium protocol has been demonstrated to be efficient for the coupling of both bromide and triflate derivatives
BrCCl3 and CBr4 was develop, enabling Kharasch-type addition/nucleophilic substitution cascade to selectively produce α-gem-dihalovinyl ketones and chromen-2-ones with moderate to good yields. Use of monoalkynes without additional nucleophilic sites furnished α-gem-dihalovinyl ketonesthrough a Kharasch-type addition and intermolecular allylic substitution cascade whereas the latter transformation of 2-ethynylphenols
Pd-catalyzed spiroannulation of 4-bromocoumarin with alkynes has been illustrated. The reaction highlights an interesting process for cascade formation of two five-membered rings through spiroannulation followed by cyclization via C–Hactivation. This method offers an attractive platform for the synthesis of a broad range of indane-fused spiropentadiene chromanones in good yields.
A conceptually new and one-pot method for the synthesis of N-arylated coumarin/pyran derivatives via Smiles rearrangement. The reaction of 4-bromocoumarin/pyran with 2-amino phenols affords O-arylated coumarin/pyran which subsequently rearranges into N-arylated coumarin/pyran under mild reaction conditions in good yields.