An efficient synthesis of some new 3-bipyridinyl substituted coumarins as potent antimicrobial agents
作者:Hemali B. Lad、Rakesh R. Giri、D.I. Brahmbhatt
DOI:10.1016/j.cclet.2013.01.041
日期:2013.3
studies in developing newantimicrobials, a series of structurally novel 3-bipyridinyl substituted coumarin derivatives 4a–f and 5a–f were synthesized by a single-step reaction protocol under Krohnke's reaction conditions. 1H NMR, 13C NMR, IR and mass spectral techniques were employed for the structural elucidation of the synthesized compounds. An evaluation of antimicrobial activity showed that almost
摘要作为开发新型抗菌剂的一项正在进行的研究的一部分,在克罗恩克反应条件下,通过一步法合成了一系列结构新颖的3-联吡啶基取代的香豆素衍生物4a-f和5a-f。1 H NMR,13 C NMR,IR和质谱技术用于合成化合物的结构阐明。抗菌活性评估表明,几乎所有化合物均比参考药物显示出更好的结果。在合成的衍生物4f,5a和5d中,发现是最有效的类似物。因此,它们可能是新药的有希望的领导者。
A Convenient Synthesis of Bipyrido‐Fused Coumarins and Their Biological Evaluation
作者:Rakesh R. Giri、Dinkar I. Brahmbhatt
DOI:10.1002/jhet.3672
日期:2019.9
A convenient and efficient strategy has been devised for the synthesis of bipyrido‐fused coumarins employing Kröhnke's pyridine synthesis approach. In the present work, 4‐hydroxycoumarins 1a–d were reacted with appropriate chalcones 2a–c to afford desired bipyridyl‐fused coumarins 3a–l. The structures of all the newly synthesized compounds 3a–l were ascertained by IR, 1H NMR, 13C NMR, mass spectral
已经设计了一种方便有效的策略,用于利用Kröhnke的吡啶合成方法合成双吡啶并结合的香豆素。在目前的工作中,使4-羟基香豆素1a - d与合适的查耳酮2a - c反应,得到所需的联吡啶基融合的香豆素3a - l。所有新合成的化合物3a - l的结构均通过IR,1 H NMR,13确定13 C NMR,质谱数据和元素分析。进一步评估化合物对代表性病原体的抗微生物反应,并将由此获得的结果与标准药物进行比较。很少有衍生物3c,3f和3i表现出有希望的效力。
Synthesis and antimycobacterial activity of some N1-[1-[3-aryl-1-(pyridin-2-, 3-, or 4-yl)-3-oxo]propyl]-2-pyridinecarboxamidrazones
N1-[1-[3-aryl-1-(pyridin-2,3-, and 4-yl)-3-oxo[propyl]-2- pyridinecarboxamidrazone derivatives were synthesized and tested for their in vitro antimycobacterial activity. Some compounds showed interesting activity against a strain of Mycobacterium tuberculosis and a strain of Mycobacterium avium.
In the present study, using chalcone as a lead compound, a series of its derivatives (compounds 1-30) were designed and synthesised. Their activity of anti-pathogenic fungi of plants has been evaluated. It is found that these compounds have good antifungal activity against Sclerotinia sclerotiorum, Helminthosprium maydis, Botrytis cinerea, Rhizoctonia solani and Gibberella zeae. Among them, the inhibition of growth for compound 30 against S. sclerotiorum showed 89.9%, with the median effective concentrations (EC50) of 15.4gmL(-1). The inhibition of growth for compounds 28, 29 and 30 at a concentration of 100gmL(-1) against H. maydis is 90.3%, 90.7% and 91.1%, with EC50 of 15.1, 18.3 and 18.1gmL(-1), respectively.