scholarly journals Design, Synthesis and Comprehensive Investigations of Pyrrolo[3,4-d]pyridazinone-Based 1,3,4-Oxadiazole as New Class of Selective COX-2 Inhibitors

2020 ◽  
Vol 21 (24) ◽  
pp. 9623
Author(s):  
Łukasz Szczukowski ◽  
Edward Krzyżak ◽  
Adrianna Zborowska ◽  
Patrycja Zając ◽  
Katarzyna Potyrak ◽  
...  

The long-term use of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) in treatment of different chronic inflammatory disorders is strongly restricted by their serious gastrointestinal adverse effects. Therefore, there is still an urgent need to search for new, safe, and efficient anti-inflammatory agents. Previously, we have reported the Mannich base-type derivatives of pyrrolo[3,4-d]pyridazinone which strongly inhibit cyclooxygenase, have better affinity to COX-2 isoenzyme and exert promising anti-oxidant activity. These findings encouraged us to perform further optimization of that structure. Herein, we present the design, synthesis, molecular docking, spectroscopic, and biological studies of novel pyrrolo[3,4-d]pyridazinone derivatives bearing 4-aryl-1-(1-oxoethyl)piperazine pharmacophore 5a,b–6a,b. The new compounds were obtained via convenient, efficient, one-pot synthesis. According to in vitro evaluations, novel molecules exert no cytotoxicity and act as selective COX-2 inhibitors. These findings stay in good correlation with molecular modeling results, which additionally showed that investigated compounds take a position in the active site of COX-2 very similar to Meloxicam. Moreover, all derivatives reduce the increased level of reactive oxygen and nitrogen species and prevent DNA strand breaks caused by oxidative stress. Finally, performed spectroscopic and molecular docking studies demonstrated that new compound interactions with bovine serum albumin (BSA) are moderate, formation of complexes is in one-to-one ratio, and binding site II (subdomain IIIA) is favorable.

2020 ◽  
Vol 17 ◽  
Author(s):  
Ramamurthy Katikireddy ◽  
Ramu Kakkerla ◽  
M.P.S. Murali Krishna ◽  
Gandamalla Durgaiah ◽  
Narasimha Reddy Yellu

: 5-(7-Methyl-2-propyl-1H-benzo[d]imidazol-5-yl)-4-phenyl-4H-1,2,4-triazole-3-thiols(6a-i) have been synthesized from key intermediate 7-methyl-2-propyl-1H-benzo[d]imidazole-5-carbohydrazide(3). The hydrazide was treated with different aryl isothiocyanatesto give corresponding thiosemicarbazone derivatives, which underwent cyclization in 4N sodium hydroxide to affordcorresponding title compound. All the compounds evaluated for their in vitro antioxidant and in vivo anti-inflammatory activity. From the results, compounds 6b and 6e have shown potential antioxidant and anti-inflammatory activity. The biological data was further supported by molecular docking studies, which revealed the binding pattern and the affinity of the molecules in the active site of COX-2.


2021 ◽  
Vol 11 (6) ◽  
pp. 13779-13789

A simple and efficient catalytic synthesis of new 1H-pyrazole-1-carbothioamide derivatives through a one-pot reaction of hydrazine hydrate, arylidene malononitrile and isothiocyanates in the presence of HAp/ZnCl2 nano-flakes at 60-70°C has been described. The protocol's main advantages include high yields of products, a wide range of substrates, simple procedure, and short reaction time. Molecular docking studies of the designed compounds were accomplished as COX-2 inhibitors and showed that compounds 3d, 3e, 3h, and 3n give promising results compared with celecoxib as a reference drug.


2007 ◽  
Vol 57 (1) ◽  
pp. 13-30 ◽  
Author(s):  
Mange Yadav ◽  
Shrikant Shirude ◽  
Devendra Puntambekar ◽  
Pinkal Patel ◽  
Hetal Prajapati ◽  
...  

Studies in 3,4-diaryl-1,2,5-oxadiazoles and theirN-oxides: Search for better COX-2 inhibitorsA series of 3,4-diaryl-1,2,5-oxadiazoles and 3,4-diaryl-1,2,5-oxadiazoleN-oxides were prepared and evaluated for COX-2 and COX-1 binding affinityin vitroand for anti-inflammatory activity by the rat paw edema method.p-Methoxy (p-OMe) substituted compounds 9, 21, 34, 41, 42 showed COX-2 enzyme inhibition higher than that showed by compounds with other substituents. 3,4-Di(4-methoxyphenyl)-1,2,5-oxadiazoleN-oxide (42) showed COX-2 enzyme inhibition of 54% at 22 μmol L-1and COX-1 enzyme inhibition of 44% at 88 μmol L-1concentrations, but showed very lowin vivoanti-inflammatory activity. Its deoxygenated derivative (21) showed lower COX-2 enzyme inhibition (26% at 22 μmol L-1) and higher COX-1 enzyme inhibition (53% at 88 μmol L-1) but, markedin vivoanti-inflammatory activity (71% at 25 mg kg-1)vs.celecoxib (48% at 12.5 mg kg-1). Molecular modeling (docking) studies showed that the methoxy group is positioned in the vicinity of COX-2 secondary pocket and it also participates in hydrogen bonding interactions in the COX-2 active site. These preliminary studies suggest thatp-methoxy (p-OMe) group in one of benzene rings may give potentially active leads in this series of oxadiazole/N-oxides.


New two derivatives of 2- methyl benzoimidazole were designed, synthesized and evaluated as a potential cyclooxygenase-2 [COX-2] inhibitors. The synthesized compounds have been recognized according to their spectral FT-IR, 1H-NMR data and physical pro- perties. The newly synthesized compounds were investigated in vivo for their anti-inflammatory activities using egg-white stimulated paw edema method with respect to the effect of propylene glycol 50%v/v [control group] and the ibuprofen [10mg/kg i.p.] was selected as a reference ligand. New compounds showed a significantly higher in vivo anti-inflammatory activity compared with ibuprofen as a reference drug. COX-2 selectivity evaluation through molecular docking via GOLD suite [v. 5.6.2.]. The new compounds via molecular docking showed significant higher activities when compared with ibuprofen as referenced drugs because of having hydrogen bonding interaction toward the key amino acids within COX-2 structure and all these results were compatible with the study of in vivo acute anti-inflammatory activities for tested compounds. ADME studies were performed to predict absorption, bioavailability, topological polar surface area, and drug-likeness. The results of ADME studies showed that all synthesized compounds absorbed from the gastrointestinal tract.


2016 ◽  
Vol 33 ◽  
pp. 8-17 ◽  
Author(s):  
Varsha S. Honmore ◽  
Amit D. Kandhare ◽  
Parag P. Kadam ◽  
Vijay M. Khedkar ◽  
Dhiman Sarkar ◽  
...  

2017 ◽  
Vol 13 (5) ◽  
Author(s):  
Golla Madhava ◽  
Katla V. Ramana ◽  
Saddala M. Sudhana ◽  
Devineni S. Rao ◽  
Kuntrapakam H. Kumar ◽  
...  

2017 ◽  
Vol 29 (11) ◽  
pp. 2559-2564
Author(s):  
M. Vijaya Bhargavi ◽  
P. Shashikala ◽  
M. Sumakanth ◽  
Shravan Kumar Gunda

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