A novel protocol for selective synthesis of monoclinic zirconia nanoparticles as a heterogeneous catalyst for condensation of 1,2-diamines with 1,2-dicarbonyl compounds
developed for the condensation of 1,2‐diketones with aromatic 1,2‐diamines in polyethylene glycol (PEG), providing quinoxaline derivatives in good yields. The important features of the methodology are broad substrates scope, simple workup, catalyst free, environmentally benign, and no requirement for metal catalysts. It is noteworthy that the cyclization reaction of 1,2‐diketones with aliphatic 1,2‐diamines
Crystalline nanobelts of α-MoO3 have been obtained successfully using novel and safe agents through a simple and safe solâgel method (polymerizingâcomplexing) and characterized by XRD, FT-IR, Raman spectroscopies, high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and the temperature programmed desorption (TPD) of ammonia. An orthorhombic lattice system for nano-MoO3 was established. The HRTEM images showed that the nanobelt morphology of α-MoO3 mostly ranged from 20â70 nm in width and 200â400 nm in length. The ammonia TPD profile demonstrated strong acidic sites. The spectral and analysis data confirmed the effectiveness of the method for the preparation of α-MoO3 nanobelts by prevention of grain growth or agglomeration of the particles. The nanostructured MoO3 exhibited a high efficiency in catalyzing the condensation reaction of various 1,2-diamine and carbonyl compounds for synthesis of heterocyclic compounds. The recovery of the title heterogenous nanocatalyst was easy and efficient and its catalytic activity was strikingly different from the bulk material.
[EN] PKB INHIBITORS AS ANTI-TUMOR AGENTS<br/>[FR] INHIBITEURS DE LA PKB UTILISES COMME AGENTS ANTITUMORAUX
申请人:IMCLONE SYSTEMS INC
公开号:WO2005007099A2
公开(公告)日:2005-01-27
The invention is directed to biaryl compounds with two six membered rings fused wherein at least one six membered ring is substituted with a thiophenyl or furanyl ring. Useful in the inhibition of PKB kinase, the treatment of cancer, or the inhibition of tumor growth.
Design, Synthesis and Opto-electrochemical Properties of Novel Donor–Acceptor Based 2,3-di(hetero-2-yl)pyrido[2,3-b]pyrazine amine derivatives as Blue-Orange Fluorescent Materials
作者:Suraj S. Mahadik、Dinesh R. Garud、Anuja P. Ware、Subhash S. Pingale、Rajesh M. Kamble
DOI:10.1016/j.dyepig.2020.108742
日期:2021.1
We herein report the design and synthesis of novel donor‒acceptor (D‒A) type 2,3-di(thiophene-2-yl)pyrido[2,3-b]pyrazine and 2,3-di(furan-2-yl)pyrido[2,3-b]pyrazine amine derivatives by employing palladium catalyzed Buchwald‒Hartwig coupling reaction. The synthesized compounds have been characterized by spectroscopic, electrochemical and thermal methods. Absorption spectra of all dyes showed an intramolecular
我们在这里报告设计和合成的新型供体受体(D typeA)型2,3-二(噻吩-2-基)吡啶[ 2,3- b ]吡嗪和2,3-二(呋喃-2-)钯催化的Buchwald‒Hartwig偶联反应合成基)吡啶基[2,3- b ]吡嗪胺衍生物。合成的化合物已通过光谱,电化学和热方法进行了表征。所有染料的吸收光谱显示出分子内电荷转移(ICT)转换(λ最大 在蓝色-橙色区域在溶液= 438-473纳米)和正溶致变色与发射最大值(λ EMM = 489–617 nm)。此外,通过FEG‒SEM技术证实,由于纳米颗粒的形成,研究了固态发射对THF-水系统中聚集诱导发射(AIE)效应的影响。通过循环伏安法测量这些分子的HOMO(-5.22至-5.75 eV)和LUMO(-3.35至-3.45 eV)能级,并通过DFT计算进行关联。基于与报道的双极性材料可比的HOMO和LUMO能级,以及有效的固态发射,保证了合成
A novel protocol for selective synthesis of monoclinic zirconia nanoparticles as a heterogeneous catalyst for condensation of 1,2-diamines with 1,2-dicarbonyl compounds
ZrO2 nanocatalyst has been obtained successfully using novel and safe agents through a simple and safe sol–gel method (polymerizing–complexing) and characterized by XRD, FT-IR, Raman spectroscopies and transmission electron microscopy (TEM). Raman spectroscopies and XRD results indicated only formation of monoclinic zirconia. TEM images revealed spherical nanoparticles with 20–40 nm diameter range. The spectral and analysis data confirmed the effectiveness of the method for preparation of monoclinic zirconia by preventing grain growth or agglomeration of particles. The nanostructured ZrO2 exhibited high efficiency in catalyzing condensation of various 1,2-diamine and 1,2-dicarbonyl compounds for the synthesis of heterocyclic compounds. The recovery of the title heterogeneous nanocatalyst was easy and efficient and its catalytic activity was strikingly different from the bulk one.