Synthesis and antimycobacterial activity of new quinoxaline-2-carboxamide 1,4-di-N-oxide derivatives
摘要:
As a continuation of our research and with the aim of obtaining new anti-tuberculosis agents which can improve the current chemotherapeutic anti-tuberculosis treatments, forty-three new quinoxaline-2-carboxamide 1,4-di-N-oxide derivatives were synthesized and evaluated for in vitro anti-tuberculosis activity against Mycobacterium tuberculosis strain H(37)Rv. Active compounds were also screened to assess toxicity to a VERO cell line. Results indicate that compounds with a methyl moiety substituted in position 3 and unsubstituted benzyl substituted on the carboxamide group provide an efficient approach for further development of anti-tuberculosis agents. (C) 2010 Elsevier Masson SAS. All rights reserved.
Es werden Umsetzungenvon Dithiocarbamaten mit weiteren β‐Lactonen zu 2 und deren Cyclisierung zu den 4‐Oxo‐2‐thioxo‐tetrahydro‐1,3‐thiazinen 3 beschrieben. Mit Diketenderivaten (β‐Propiolactonen mit exocyclischer Doppelbindung) werden keine 1,3‐Thiazine 6 erhalten, sondern unter Schwefelkohlenstoff‐Eliminierung β‐Ketosäureamide 7.
Under mild conditions, a series of α,α-difluoro-β-ketoamides were synthesized with Selectfluor® as the F+ source in the presence of K2CO3 in the mixed-solvent of water and PEG-400 (VH2O:VPEG-400=3:1), without additional phase-transfer catalyst. By using this approach, most cases examined in this study proceeded in nearly quantitative conversions regardless of the electronic nature of the substituent
在温和条件下,一系列的α,α二氟β酮酰胺用的Selectfluor合成®的F +的K的存在源2 CO 3在水和PEG-400混合溶剂(伏特H2个Ø:伏特聚乙二醇400=3:1个),无需额外的相转移催化剂。通过使用这种方法,大多数情况下,在这项研究中取代形式的电子性质的几乎定量进行转换,无论检查。
Preparation and antiinflammatory activity of 2- and 4-pyridones
作者:James Benjamin Pierce、Zaven S. Ariyan、Gaye Stuart Ovenden
DOI:10.1021/jm00344a008
日期:1982.2
been self-condensed to form pyridones. N-Alkylacetoacetamides give 2-pyridones, while N-arylacetoacetamides give 4-pyridones. In an attempt to develop nonacidic, nonsteroidal antiinflammatory agents, the pyridones were tested in a carrageenan-induced pedal edema assay in rats. While the 2-pyridones were not active, 9 of 17 4-pyridones tested were active, and one compound (4g) had antiinflammatory efficacy
Mediated by sodium persulfate (Na(2)S(2)0(8)), a series of polysubstituted 4-pyridones were synthesized via self-condensation of N-aryl acetoacetamides, during which a novel N to C 1,3-acyl migration should be involved. The structure of 4-pyridone was unequivocally confirmed by X-ray diffraction analysis. However, the self-condensation of N-benzyl acetoacetamides under the same condition gave polysubstituted 2-pyridones instead of 4-pyridones.
5,6-Dihydroimidazo[2,1-b]thiazole-2-carboxamide derivatives or salts thereof