Synthesis and antibacterial evaluation of furan derivatives bearing a rhodanine moiety
摘要:
Two series of furan derivatives bearing a rhodanine moiety (4a-l and 5a-l) have been synthesized, characterized, and evaluated for their antibacterial activity. The majority of these compounds showed potent levels of inhibitory activity against a variety of different Gram-positive bacteria, including multidrug-resistant clinical isolates, with minimum inhibitory concentration (MIC) values in the range of 2-16 mu g/mL. In particular, compound 4l was found to be the most potent of the synthesized compounds against the multidrug-resistant strains, with a MIC value of 2 or 4 mu g/mL. None of the compounds exhibited any activity against the Gram-negative bacteria Escherichia coli 1356 at 64 mu g/mL. An examination of the cytotoxicities of these agents revealed that they displayed low levels of toxicity toward HeLa cells. All of the compounds synthesized in the current paper were characterized by H-1 and C-13 NMR, infrared, and mass spectroscopy.
Synthesis and antibacterial evaluation of furan derivatives bearing a rhodanine moiety
摘要:
Two series of furan derivatives bearing a rhodanine moiety (4a-l and 5a-l) have been synthesized, characterized, and evaluated for their antibacterial activity. The majority of these compounds showed potent levels of inhibitory activity against a variety of different Gram-positive bacteria, including multidrug-resistant clinical isolates, with minimum inhibitory concentration (MIC) values in the range of 2-16 mu g/mL. In particular, compound 4l was found to be the most potent of the synthesized compounds against the multidrug-resistant strains, with a MIC value of 2 or 4 mu g/mL. None of the compounds exhibited any activity against the Gram-negative bacteria Escherichia coli 1356 at 64 mu g/mL. An examination of the cytotoxicities of these agents revealed that they displayed low levels of toxicity toward HeLa cells. All of the compounds synthesized in the current paper were characterized by H-1 and C-13 NMR, infrared, and mass spectroscopy.
Spirocyclopropanes from Intramolecular Cyclopropanation of Pyranopyrazoles and Pyranopyrimidine-diones and Lewis Acid Mediated (3 + 2) Cycloadditions of Spirocyclopropylpyrazolones
作者:Prasun Mukherjee、Asish R. Das
DOI:10.1021/acs.joc.7b00089
日期:2017.3.3
A robust intramolecular cyclopropanation reaction was first performed on pyranopyrazole and pyranopyrimidine-dione derivatives to obtain spirocyclopropylpyrazolones and barbiturates, using iodosylbenzene (PhIO) or the combination of iodobenzene diacetate (PIDA)/molecular iodine (I2), under mildreaction conditions. Syntheses of functionally and stereochemically diversified, novel spiropyrazolone fused
Studies With Functionally Substituted Heteroaromatics: A Novel Route for the Synthesis of 1-Aryl-6-oxopyridazinones, 1-Arylpyridazine-6-imines and 1-Aryl-6-imino-4-pyridazinals
作者:Fatima Al-Omran、Mervat Mohammed Abdel Khalik、Adel Abou-Elkhair、Mohammed Hilmy Elnagdi
DOI:10.1055/s-1997-1512
日期:1997.1
Aryldiazonium salts couple with the 3-dimethylamino-1-substituted enones 1 a-c to yield 2-arylhydrazono-3-oxo-3-substituted-propanals which are excellent precursors for the synthesis of pyridazinones. The coupling reaction of 2-cyano-5-dimethylamino-3-substituted-penta-2,4-dienonitrile 12 a-b with benzene diazonium salts in ethanolic sodium hydroxide gives the pyridazinals 13 a, b.
Coupling Reactions of Diazonium Betaines with Alkyl Dicyanoacetates
作者:Richard Neidlein、Zhihua Sui
DOI:10.1080/00397919208021297
日期:1992.1
Abstract The reactions of heterocyclic diazonium betaines, 4-aryl-3-diazo-pyrazole and 3-diazo-indazole, at the α-carbon atoms of alkyl dicyanoacetates gave corresponding azo-compounds.
Intramolecular nitrile imide cycloadditions onto the furan ring have been exploited in the construction of the hitherto unknown 3a,4-dihydro-6H-difuro[3,2-c;3,4-d]pyrazole skeleton.