Synthesis and antimicrobial evaluation of 3-methanone-6-substituted-benzofuran derivatives
摘要:
Seventeen benzofuran derivatives were synthesized and screened for their antibacterial activities against Escherichia coli, Staphylococcus aureus, Methicillin-resistant S. aureus, Bacillus subtilis, and Pseudomonas aeruginosa. Seven of them have showed excellent antibacterial activities compared to the positive controls (Cefotaxime and Sodium Penicillin). The substitutions at C-6 and C-3 positions of these derivatives were found to greatly impact on the antibacterial activity and strains specificity, respectively. Specifically, compounds bearing a hydroxyl group at C-6 (5a, 5b, 5c and 12) offered excellent antibacterial activities against all five above-mentioned strains (MIC80 = 0.78-12.5 ug/mL), and those with imine (15) and (3, 4, 5-trimethoxyphenyl) methanone (7e), respectively, at C-3 position showed selective activity against S. aureus among five tested strains with great MIC80 values (3.12-12.5 ug/mL). (C) 2012 Elsevier Masson SAS. All rights reserved.
Regioselective Preparation of Benzo[<i>b</i>]furans from Phenols and α<i>-</i>Bromoketones
作者:Leire Arias、Yosu Vara、Fernando P. Cossío
DOI:10.1021/jo201841y
日期:2012.1.6
In this paper, a fully regiocontrolled synthesis of either 2- and 3-substituted benzo[b]furans is described. Direct reaction between phenols and α-bromoacetophenones in the presence of neutral alumina yields 2-substitutedbenzo[b]furans with complete regiocontrol. When a basic salt such as potassium carbonate is used, the corresponding 2-oxoether is obtained. Cyclization of these latter compounds promoted
在本文中,描述了2-和3-取代的苯并[ b ]呋喃的完全区域控制的合成。在中性氧化铝存在下,苯酚与α-溴乙酰苯之间的直接反应生成具有完全区域控制能力的2取代的苯并[ b ]呋喃。当使用碱性盐如碳酸钾时,获得了相应的2-氧代醚。由中性氧化铝促进的这些后面化合物的环化产生相应的3-取代的苯并[ b ]呋喃。使用前一种方法,可以在两个制备步骤中从商业来源获得Moracin M和其他类似物。DFT计算提供了合理的反应路径,以了解2-取代的苯并[ b ]呋喃的形成。
Deconstructive Reorganization: De Novo Synthesis of Hydroxylated Benzofuran
An unprecedented deconstructive reorganization strategy for the denovosynthesis of hydroxylated benzofurans from kojic acid- or maltol-derived alkynes is reported. In this reaction, both the benzene and furan rings were simultaneously constructed, whereas the pyrone moiety of the kojic acid or maltol was deconstructed and then reorganized into the benzene ring as a six-carbon component. Through this
An efficient and ligand‐free palladium‐catalyzed arylation of benzofurans has been developed with N′ ‐acyl arylhydrazines as the coupling partners. This protocol features a wide functional‐group tolerance and highly regioselective products.
Transition metal directed synthesis of moracin M, a phytoalexin of Morus alba Linn.
作者:Inderjit S. Mann、David A. Widdowson、John M. Clough
DOI:10.1016/s0040-4020(01)81951-7
日期:1991.9
2-(5-Resorcinyl)benzofurans have been synthesised by the palladium catalysed cross coupling of 2-trimethylstannyl-or 2-bromozinc benzofurans with the appropriately functionalised 5-iodoresorcinols. These were synthesised by the tri-isopropylsilyloxy directed remote (C-5) lithiation/iodination of the O,O-di(tri-isopropylsilyl)resorcinoltricarbonylchromium(0) complex. The method was applied to the synthesis