213013-03-7Relevant academic research and scientific papers
Design, synthesis and in-vitro evaluation of fluorinated triazoles as multi-target directed ligands for Alzheimer disease
Dalvi, Tanay,Dewangan, Bhaskar,Agarwal, Gopal,Shinde Suchita, Dattatray,Jain, Alok,Srivastava, Akshay,Sahu, Bichismita
, (2021/04/27)
Alzheimer disease is multi-factorial and inflammation plays a major role in the disease progression and severity. Metals and reactive oxygen species (ROS) are the key mediators for inflammatory conditions associated with Alzheimer's. Along multi-factorial nature, major challenge for developing new drug is the ability of the molecule to cross blood brain barrier (BBB). We have designed and synthesized multi-target directed hexafluorocarbinol containing triazoles to inhibit Amyloid β aggregation and simultaneously chelate the excess metals present in the extracellular space and scavenge the ROS thus reduce the inflammatory condition. From the screened compound library, compound 1c found to be potent and safe. It has demonstrated inhibition of Amyloid β aggregation (IC50 of 4.6 μM) through selective binding with Amyloid β at the nucleation site (evidenced from the molecular docking). It also chelate metals (Cu+2, Zn+2 and Fe+3) and scavenges ROS significantly. Due to the presence of hexafluorocarbinol moiety in the molecule it may assist to permeate BBB and improve the pharmacokinetic properties. The in-vitro results of compound 1c indicate the promiscuity for the development of hexafluorocarbinol containing triazoles amide scaffold as multi-target directed therapy against Alzheimer disease.
Co-catalyst and solvent free nitrogen rich triazole based organocatalysts for cycloaddition of CO2 into epoxide
Elkadi, Mirella,Khattak, Zafar A. K.,Suleman, Suleman,Ullah, Habib,Verpoort, Francis,Younus, Hussein A.
, (2020/07/21)
A general synthesis of triazole-based catalysts remains a significant challenge. Consequently, triazole-based catalysts are rarely studied. Herein, the first report is presented for the construction of cyclic carbonates using triazole-based organocatalyst
Triazole based cobalt catalyst for CO2 insertion into epoxide at ambient pressure
Suleman, Suleman,Younus, Hussein A.,Ahmad, Nazir,Khattak, Zafar A.K.,Ullah, Habib,Park, Jihae,Han, Taejun,Yu, Baoyi,Verpoort, Francis
, (2020/01/03)
Over the past decades, a lot of efforts have been made for the fixation of carbon dioxide (CO2) into epoxide for the synthesis of industrially important cyclic carbonates. Here, a cobalt(II) complex based on triazole, namely Co(II)-1,2,3-1H-triazole-4-carboxylate, was synthesized, fully characterized by FTIR, NMR, mass spectrometry, and single crystal X-ray diffraction, and used as a catalyst for the cycloaddition of CO2 to epoxides. The catalytic studies demonstrated that the catalyst is highly active for the CO2 fixation, with high turnover number (TON, 85 × 103) even without the use of solvent and at ambient pressure (1 bar) to produce a variety of different cyclic carbonates depending on the epoxide. Remarkably, the catalyst was used continuously further by the addition of a fresh amount of the substrate within the same reaction mixture for at least five successive reaction cycles without any loss in the catalytic activity.
Water Oxidation at Neutral pH using a Highly Active Copper-Based Electrocatalyst
Younus, Hussein A.,Zhang, Yan,Vandichel, Matthias,Ahmad, Nazir,Laasonen, Kari,Verpoort, Francis,Zhang, Ce,Zhang, Shiguo
, p. 5088 - 5099 (2020/08/12)
The sluggish kinetics of the oxygen evolution reaction (OER) at the anode severely limit hydrogen production at the cathode in water splitting systems. Although electrocatalytic systems based on cheap and earth-abundant copper catalysts have shown promise
N-Mesityl-C-acylketenimines: 1,5-Sigmatropic Shifts and Electrocyclization to Quinolines
Rao, V. V. Ramana,Fulloon, Belinda E.,Bernhardt, Paul V.,Koch, Rainer,Wentrup, Curt
, p. 5779 - 5786 (2007/10/03)
Flash vacuum thermolysis (FVT) of triazoles 6a- c generates α-oxoketenimines 10, the ester 10a being isolable. FVT of pyrroledione 8 generates the isomeric imidoylketene 9a. Ketenes 9 and ketenimines 10 undergo thermal interconversion by 1,3-shifts of methoxy and dimethylamino groups under mild FVT conditions (ca. 350-400°C). Both 9 and 10 are directly observable by IR spectroscopy at either 77 K or on Ar matrix isolation at 12 K. On FVT at temperatures above ca. 400°C, the ketenimines 10 undergo a 1,5-H shift to o-quinoid imines 12/13, followed by electrocyclization to dihydroquinolines 14 (unobserved) and 15 (observed by NMR). The latter are easily oxidized to alkylquinoline-3-carboxylates or quinoline-3-carboxamides 16 by atmospheric oxygen. Ab initio calculations on model compounds 18-23 predict an energy barrier of ca. 38 kcal mol-1 (161 kJ mol-1) for the 1,5-H shift in N-(o-methylphenyl)ketenimines via the transition state TS19 followed by an electrocyclization barrier to dihydroquinoline 23a via TS22a of ca. 16 kcal mol-1.
