合成了一系列新颖的荧光芳基苯乙烯基咪唑并[1,2-a]吡啶,并对其进行了充分表征。如1 H NMR光谱法明确显示的,所有苯乙烯基衍生物具有乙烯基双键的E-构型。观察到,E异构体在固态下是稳定的。然而,具有强供电子二烷基氨基取代基的衍生物经历了部分E - Z在室温下在溶液中异构化。苯乙烯基衍生物在紫外线或可见光区域吸收并发出中等斯托克斯位移的光。这些化合物表现出氟溶剂变色,即发射带随着溶剂极性的增加而红移。而且,由于咪唑并[1,2-a]吡啶环的氮原子的质子化增加了π系统的供体-受体相互作用,因此,苯乙烯基衍生物的吸收和发射性质在酸化后会急剧变化。
Inhibitors of the fungal cell wall. Synthesis of 4-aryl-4- N -arylamine-1-butenes and related compounds with inhibitory activities on β(1–3) glucan and chitin synthases
作者:Juan M Urbina、Juan C.G Cortés、Alirio Palma、Silvia N López、Susana A Zacchino、Ricardo D Enriz、Juan C Ribas、Vladimir V Kouznetzov
DOI:10.1016/s0968-0896(00)00003-1
日期:2000.4
As part of our project devoted to the search for antifungal agents, which act via a selective mode of action, we synthesized a series of new 4-aryl- or 4-alkyl-N-arylamine-1-butenes and transformed some of them into 2-substituted 4-methyl-tetrahydroquinolines and quinolines by using a novel three-step synthesis. Results obtained in agar dilution assays have shown that 4-aryl homoallylamines not possessing
Substituent Cross-Interaction Effects on the Electronic Character of the CN Bridging Group in Substituted Benzylidene Anilines − Models for Molecular Cores of Mesogenic Compounds. A <sup>13</sup>C NMR Study and Comparison with Theoretical Results
作者:Helmi Neuvonen、Kari Neuvonen、Ferenc Fülöp
DOI:10.1021/jo0600508
日期:2006.4.1
could be verified. The electroniceffects of the neighboring aromatic ring substituents systematically modify the sensitivity of the CN group to the electroniceffects of the benzylidene or aniline ring substituents. Electron-withdrawing substituents on the aniline ring decrease the sensitivity of δC(CN) to the substitution on the benzylidine ring, while electron-donating substituents have the opposite
在CDCl 3中,对一系列介晶分子模型化合物(即C 13)测量了13 C NMR化学位移δC (C N)。取代的亚苄基苯胺p -X C 6 H 4 CH NC 6 H 4 p -Y(X = NO 2,CN,CF 3,F,Cl,H,Me,MeO或NMe 2; Y = NO 2,CN ,F,Cl,H,Me,MeO或NMe 2)。δ的取代基依赖性Ç(CN)被用作研究电子取代基对偶氮甲碱单元的作用的工具。亚苄基取代基X有δ的反向效应Ç(C N):吸电子原因屏蔽的取代基,而给电子性的人的行为相反,感应效果清楚地在共振效应为主。相反,苯胺取代基Y发挥正常作用:吸电子取代基引起屏蔽,而供电子取代基引起C N碳屏蔽,感应效应和共振效应的强度非常相似。此外,可以验证X和Y之间是否存在特定的交叉相互作用。相邻芳环取代基的电子效应可系统地改变C的灵敏度N基团对亚苄基或苯胺环取代基的电子作用。吸电子苯胺环上的取代基降低δ的灵敏度Ç(C
Preparation of 2-azetidinones by cyclocondensation of carboxylic acids and imines via diphosphorustetraiodide
作者:Maaroof Zarei、Fatemeh Maaqooli
DOI:10.1080/00397911.2016.1148165
日期:2016.3.18
ABSTRACT One-pot mild synthesis of 2-azetidinones was carried out by the reaction of imines and carboxylic acids in dry dichloromethane at room temperature using diphosphorus tetraiodide. It was also applied for synthesis of 3-spiro-2-azetidinones. The synthesized compounds were characterized by analytical and spectral (infrared, 1H NMR, 13CNMR, and elemental analysis) data. GRAPHICAL ABSTRACT
A new series of 4-aryl and 4-alkyl-4-N-arylamine-1-butenes (homoallylamines) were synthesized and some of them transformed to 4-aryl or alkylquinolines. All of them showed strong antifungal activities against human pathogenic fungi in vitro, being Epidermophyton floccosum the most susceptible species.
An expeditious one-pot synthesis of substituted phenylazetidin-2-ones in the presence of zeolite
作者:Ramakanth Pagadala、Jyotsna S. Meshram、Himani N. Chopde、Venkateshwarlu Jetti、V. Udayini
DOI:10.1002/jhet.604
日期:2011.9
In this study, one‐pot rapid and efficient series of phenylazetidin‐2‐ones were synthesized from N,N‐dimethylaminobenzaldehyde, different substituted aromatic amines and phenylacetyl chloride in the presence of zeolite catalyst under microwave irradiation. We also reported schiffbases (1a–j) by classical and conventional microwave technique. The titled compounds are evaluated for their antimicrobial