Sonochemically synthesized ferromagnetic Fe<sub>3</sub>O<sub>4</sub>nanoparticles as a recyclable catalyst for the preparation of pyrrolo[3,4-c]quinoline-1,3-dione derivatives
作者:Nagaraj Basavegowda、Kanchan Mishra、Yong Rok Lee
DOI:10.1039/c4ra11623b
日期:——
This paper reports the green, rapid synthesis of Fe3O4 nanoparticles by the ultrasonic irradiation of Fe2O3 solution and Perilla frutescens (P. frutescens) leaf extract, which was used as both reducing and capping agent. The synthesized Fe3O4 nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray analysis, vibrating sample magnetometry, thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The FT-IR spectra indicated that the bioactive molecules present in the plant extract contain polyols, which act as a reducing as well as capping agent, as confirmed by TGA. TEM and SEM showed that the Fe3O4 nanoparticles were approximately spherical in shape with a mean size of 50 nm. The synthesized Fe3O4 nanoparticles exhibited ferromagnetic behavior with a saturation magnetization of 25.15 emu g−1. The Fe3O4 nanoparticles, with their easy recovery by an external magnetic field, exhibited strong catalytic activity towards pyrrolo[3,4-c]quinoline-1,3-dione derivatives. These results suggest that the Fe3O4 nanoparticles produced can be applied as a catalyst in organic synthesis and recycled at least five times without significant loss in its activity.
Efficient one-step synthesis of pyrrolo[3,4-c]quinoline-1,3-dione derivatives by organocatalytic cascade reactions of isatins and β-ketoamides
作者:Likai Xia、Yong Rok Lee
DOI:10.1039/c3ob40791h
日期:——
We describe an efficient one-step synthesis of pyrrolo[3,4-c]quinolinedione derivatives using ethylenediamine diacetate (EDDA)-catalyzed cascade reactions of isatins and β-ketoamides. It is the first direct conversion of isatins to pyrrolo[3,4-c]quinolinedione derivatives via C–N bond cleavage and isatin ring expansion. Furthermore, this reaction provides a one-step synthetic route for the production
我们描述了一种高效的一步合成吡咯并[3,4- c ]喹啉二酮衍生物,使用乙二胺二乙酸酯(EDDA)催化的isatins和β-ketoamides级联反应。这是首次通过C–N键断裂和Isatin环扩环将Isatins直接转化为吡咯并[3,4- c ] quinolinedione衍生物。此外,该反应提供了一步合成路线,用于生产通常使用多步反应制备的生物学上感兴趣的复杂分子。
Microwave-Assisted Synthesis of Diverse Pyrrolo[3,4-<i>c</i>]quinoline-1,3-diones and Their Antibacterial Activities
作者:Likai Xia、Akber Idhayadhulla、Yong Rok Lee、Sung Hong Kim、Young-Jung Wee
DOI:10.1021/co500002s
日期:2014.7.14
With the aim of developing a general and practical method for library production, a novel and efficient two-phase microwave-assisted cascade reaction between isatins and beta-ketoamides in [Bmim]BF4/toluene was developed for the synthesis of pyrrolo[3,4-c]quinoline-1,3-diones. The features of this methodology are, the use of microwave-assisted rapid synthesis, mild reaction conditions, high yields, operational simplicity, facile product separation, and recyclability. Furthermore, the antibacterial activities of the pyrrolo[3,4-c]quinoline-1,3-dione derivatives produced were evaluated against Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Enterobacter aerogenes) and Gram-positive bacteria (Bacillus cereus and Staphylococcus aureus). These derivatives showed antibacterial activities against Gram-positive strains that were at least equivalent to that against Gram-negative strains. Compound 73,5} displayed the most potent antibacterial activity against P. aeruginosa (MIC = 0.5 mu g/mL) and greater activity than standard ampicillin (MIC = 1 mu g/mL). Compound 74,7} exhibited the best inhibitory activity against E. coli and E. aerogenes (MIC = 1 and 0.5 mu g/mL), compared with the standard ampicillin (both MICs = 1 mu g/mL). The synthesized pyrrolo[3,4-c]quinoline-1,3-diones are expected to be widely used as lead compounds for the development of new antibacterial agents.
YXOB, S. V.;KONSHIN, M. E., XIMIYA GETEROTSIKL. SOED.,(1988) N 5, 652-653
作者:YXOB, S. V.、KONSHIN, M. E.
DOI:——
日期:——
Synthesis and reactions of 3-(N-arylcarbamoyl)-2-methylcinchoninic acid