设计,合成和鉴定了33个新的2,3-二氢喹啉-4(1 H)-one类似物,并通过IR,1 H NMR,13 C NMR和HRMS进行了表征。化合物2g和4l的晶体结构通过单晶X射线衍射表征。他们的抗真菌活性对五种植物病原真菌即确定纹枯病,Fusarum菌,长蠕玉米小斑病,菌核病和灰霉病。结果表明,它们中的大多数在20 mg / L时显示出显着的抗真菌活性。化合物4e表现出对灰葡萄孢的最强抗真菌活性,并且比市售杀菌剂氟吡草胺具有更好的效果。同时,评估活性化合物对琥珀酸脱氢酶(SDH)的抑制活性。结果显示它们表现出优异的活性。化合物4e具有比氟吡兰更好的抑制活性。分子建模结果表明,化合物4e可与SDH的结合位点牢固结合并相互作用。首次报道了2,3-二氢喹啉-4(1 H)-one衍生物对SDH的抑制活性。
设计,合成和鉴定了33个新的2,3-二氢喹啉-4(1 H)-one类似物,并通过IR,1 H NMR,13 C NMR和HRMS进行了表征。化合物2g和4l的晶体结构通过单晶X射线衍射表征。他们的抗真菌活性对五种植物病原真菌即确定纹枯病,Fusarum菌,长蠕玉米小斑病,菌核病和灰霉病。结果表明,它们中的大多数在20 mg / L时显示出显着的抗真菌活性。化合物4e表现出对灰葡萄孢的最强抗真菌活性,并且比市售杀菌剂氟吡草胺具有更好的效果。同时,评估活性化合物对琥珀酸脱氢酶(SDH)的抑制活性。结果显示它们表现出优异的活性。化合物4e具有比氟吡兰更好的抑制活性。分子建模结果表明,化合物4e可与SDH的结合位点牢固结合并相互作用。首次报道了2,3-二氢喹啉-4(1 H)-one衍生物对SDH的抑制活性。
Bifunctional catalysts bearing two catalytic sites, Lewis acidic organometallic titanocene and Brønsted acidic COOH, have been assembled in situ from Cp2TiCl2 with carboxylic acid ligands, showing high catalytic activity over an intramolecular Mannich reaction towards synthesis of 2‐aryl‐2,3‐dihydroquinolin‐4(1H)‐ones. The determination of the bifunctional catalyst Cp2Ti(C8H4NO6)2 was elucidated by
具有羧酸催化配体的Cp 2 TiCl 2原位组装了带有两个催化位点的Lewis酸性有机金属钛茂和Brønsted酸性COOH双功能催化剂,在分子内曼尼希反应中对2-芳基-2,3的合成显示出高催化活性。 -dihydroquinolin-4(1H)-1。双功能催化剂Cp 2 Ti(C 8 H 4 NO 6)2的测定单个X射线HRMS和催化行为的研究阐明了这一点。特别是,用休眠的COOMe掩盖布朗斯台德酸性COOH催化位点会大大降低反应产率,这表明两个催化位点共同作用以保持高催化效率。
Lithium tetrafluoroborate catalyzed highly efficient inter- and intramolecular aza-Michael addition with aromatic amines
Abstract Lithium tetrafluoroborate has been demonstrated for the first time to be an efficient catalyst in intermolecular aza-Michael addition aromatic amines to electron deficient alkenes. Suitability of the same catalyst in intramolecular aza-Michael addition leading 2-aryl-2,3-dihydroquinolin-4(1H) ones has also been described.
Eco-friendly polyethylene glycol promoted Michael addition reactions of α,β-unsaturated carbonyl compounds
作者:Dalip Kumar、Gautam Patel、Braja G. Mishra、Rajender S. Varma
DOI:10.1016/j.tetlet.2008.09.116
日期:2008.12
Intra- and inter-nucleophilic addition reactions of different α,β-unsaturatedcarbonylcompounds were found to be highly effective without any additives in PEG-400 as a recyclable reaction medium under neutral conditions.
Ytterbium(III) triflate: An efficient and simple catalyst for isomerization of 2′-hydroxychalcone and 2′-aminochalcones in ionic liquid
作者:V. Kameswara Rao、M. Sudershan Rao、Anil Kumar
DOI:10.1002/jhet.760
日期:2011.11
Isomerization of 2′‐hydroxychalcone and 2′‐aminochalcone have been investigated using ytterbium(III) trifluromethanesulfonate Yb(OTf)3} (30 mol %) as Lewis acid catalyst in [bmim][BF4] ionicliquid. The effect of different metal triflates as Lewis acid, catalyst loading and reaction media was studied for this isomerization reaction. Advantages of the methodology include short reaction time, excellent
2-Substituted-4-quinolones 2 and the corresponding 2,3-dihydro-2-substituted-4-quinolones 3 have been obtained by reduction with CO at 170 °C and 30 atm of 2-nitrochalcones 1, catalysed by Ru3(CO)12 with DIAN-Me as co-catalyst in ethanol–water.