Pyrazole[3,4-d]pyridazine derivatives: Molecular docking and explore of acetylcholinesterase and carbonic anhydrase enzymes inhibitors as anticholinergics potentials
Graphical abstract
Introduction
The pyrazoles are essential parts of many heterocyclic compounds. They have extensive workspace due to biologic activities and medicinal properties [1], [2]. These molecules have potential applications such as antibacterial, antifungal, antibiotics, insecticide, pesticide, biosensors, etc., [3], [4], [5], [6], [7]. Pyrazole molecules are known to exhibit specific properties such as antiviral, antitumor, antidepressant, anti-inflammatory and antioxidant activities [8], [9], [10], [11]. In the medical sector, the pyrazoles are used in the structure of some drugs such as Viagra, Celebrex, and Zerbaxa [12], [13], [14]. Additionally, pyrazole-pyridazine derivatives were used in agricultural products and drug researches due to their diverse biological activities [15]. Furthermore, substituted pyrazoles were used in the polymer structures in terms of optoelectronic properties [16]. The commonly used methods for synthesis of the pyrazole-pyridazine derivatives are reported the cyclocondensation of hydrazine hydrate or monosubstituted hydrazines and 1,3-dicarbonyl compounds [17], [18]. In this study, the synthesis of pyrazole-pyridazine was performed using various hydrazines and substituted pyrazole. The synthesized molecules were characterized by IR, NMR, and Mass analysis.
Carbonic anhydrase (CA) isozymes catalyze the reversible hydration of carbon dioxide (CO2) to produce bicarbonate anion (HCO3−) and a proton (H+) [19], [20]. Hence, these enzyme superfamily members including sixteen isoenzymes are primer controllers of pH outside and within the cell. Diversity in subcellular localization and catalytic activity, carbonic anhydrase isoenzymes show the main range of biological aims with several therapeutic potentials [21], [22]. In particular, inhibitor compounds of hCA I and II isozymes in human cells are utilized as factors for treating glaucoma and edema. Membrane-bound brain-associated hCA IV isoenzyme is involved in pH regulation in neuron cells and glial cells analogously to the tumor-associated CA IX isoform. This plays an important role in progression, acidification of tumors, and metastasis in various cancers. A new approach to therapy of obesity and epilepsy is evaluated by inhibition behavior of special isozymes of CA [23], [24]. Indeed, selective inhibitor compounds of CA isoforms in pathogenic microorganisms is gaining enhancing consideration as a new method of therapy of infectious disease [25].
Acetylcholine (ACh) is the main player as far as Alzheimer's disease (AD) is interesting which is synthesized by choline acetyltransferase (CAT). This area of the brain cell is affected in the pathophysiological phenomenon of the AD [26], [27]. This reasons, finally, a marked difference in ACh and CAT synthesis. CAT amounts are decreased 58–90% in the AD, which raises the severity of dementia [28]. Acetylcholinesterase (AChE) is the enzyme accountable for the degradation of the ACh, which is markedly decreased in the AD. Therefore, these enzymes cholinergic synapses waiting for ACh and choline acetate is a key enzyme responsible for the hydrolysis. AChE enzyme, both three-dimensional structure of the active site amino acid sequence of the enzyme is related to many insects, and nerve transmission in the backbone is highly conserved [29]. Organic compounds with the potential to inhibit AChE enzyme or AChE inhibitors (AChEIs) are also very noteworthy due to their significance in the therapy of multiple neurodegenerative diseases. It is expected that AD, an extensive shape of dementia, will increase its prevalence globally and will be a significant problem for human health in the coming periods [30].
Herein, the facile synthesis to condensation reaction of pyrazole-3-carboxylic acid compounds (1a,b) and pyrazole[3,4-d]pyridazine (2a–n) derivatives have been reported, and their inhibition potential of hCA I, and II isoenzymes were investigated. The most suitable and potent AChE inhibition effects of these molecules are also studied.
Section snippets
Materials and equipment
All chemicals used in this study were purchased from Sigma (Steinheim, Germany) and Merck (Darmstadt, Germany) companies. Bruker DRX-400 MHz FT-NMR spectrometer was employed to obtain the structure of molecules at 1 H (400 MHz) and 13 C (100 MHz) NMR spectra. The infrared spectra were recorded on a Perkin Elmer Precisely Spectrum. Samples were used as pellet form, and the measuring range was from 4.000 to 450 cm−1. An LC/MS spectrometer (Thermo Scientific TSQ-Quantum Access) was used to measure
Chemistry
The pyrazole[3,4-d]pyridazine compounds are the most commonly studied subject in heterocyclic chemistry due to their biologic activities [17]. Therefore, pyrazole[3,4-d]pyridazine compounds were prepared, and spectroscopic methods confirmed their structures. Initially, pyrazole-3-carboxylic acid (1a,b) compounds were prepared by our research group. Pyrazole[3,4-d]pyridazine (2a–n) derivatives were directly obtained by cyclization reaction synthesized 1a and b compounds and various hydrazines as
Conclusion
Finally, a series of pyrazole-3-carboxylic acids (1a and b) and pyrazole[3,4-d]pyridazine (2a–n) derivatives were synthesized. These compounds were analyzed for AChE inhibition properties and hCAs I and II isoforms. Pharmacophores have gained significant importance in many different synthetic drug designs due to their various biological activities and the scaffolds of various bioactive natural compounds. Among the scaffolds of these compounds, thiazole and coumarin have recently attracted
Acknowledgments
The authors would like to thank Dr. Halide Sedef Karaman for providing technical guidance during the docking study of this article and for supporting small drug discovery software.
Declaration of Competing Interest
The authors declared that there is no conflict of interest.
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