Novel 1,3,4-thiadiazole compounds as potential MAO-A inhibitors - design, synthesis, biological evaluation and molecular modelling.

Monoamine oxidases (MAOs) are important drug targets for the management of neurological disorders. Herein, a series of new 1,3,4-thiadiazole derivatives bearing various alkyl/arylamine moieties as MAO inhibitors were designed and synthesized. All of the compounds were more selective against MAO-A than MAO-B.

Design, Synthesis and Biological Evaluation of a Novel Series of Thiadiazole- Based Anticancer Agents as Potent Angiogenesis Inhibitors.

Background: Thiadiazole has attracted a great deal of interest as a versatile heterocycle for the discovery and development of potent anticancer agents. Thiadiazole derivatives exert potent antitumor activity against a variety of human cancer cell lines through various mechanisms.

Objective: The goal of this work was to design and synthesize thiadiazole-based anticancer agents with anti-angiogenic activity.

Design, synthesis, biological evaluation, and docking studies of some novel chalcones as selective COX-2 inhibitors.

A new series of chalcones (1-9) possessing an SO CH COX-2 pharmacophore at the para position of the C-1 phenyl ring was synthesized via the Claisen-Schmidt condensation reaction and examined for their inhibition potential against cyclooxygenase (COX) enzymes. Their structures were elucidated by infrared, H NMR (nuclear magnetic resonance), C NMR, and high-resolution mass spectroscopic methods. Enzyme inhibition studies revealed that most of the compounds showed a moderate-to-strong inhibitory activity (IC  = 0.

Synthesis of some new benzoxazole derivatives and investigation of their anticancer activities.

Phortress is an anticancer prodrug, which has active metabolite (5F-203) being potent agonist of the aryl hydrocarbon receptor (AhR). The 5F-203 switches on cytochrome P450 CYP1A1 gene expression and thus exhibits anticancer activity. In this study, it is aimed to obtain new phortress analogues by bioisosteric replacement of benzothiazole core in the structure to benzoxazole ring system.

Design, synthesis and biological assessment of new selective COX-2 inhibitors including methyl sulfonyl moiety.

Nonsteroidal anti-inflammatory drugs (NSAIDs) cause peptic lesions in the gastrointestinal mucosa by inhibiting the cyclooxygenase-1 (COX-1) enzyme. Selective COX-2 inhibition causes decreased side effects over current NSAIDs. Therefore, the studies about selective inhibition of COX-2 enzyme are very important for new drug development.

Design, Synthesis, In Vitro and In Silico Studies of New Thiazolylhydrazine-Piperazine Derivatives as Selective MAO-A Inhibitors.

Monoamine oxidase (MAO) isoenzymes are very important drug targets among neurological disorders. Herein, novel series of thiazolylhydrazine-piperazine derivatives were designed, synthesized and evaluated for their MAO-A and -B inhibitory activity. The structures of the synthesized compounds were assigned using different spectroscopic techniques such as H-NMR, C-NMR and HRMS.

Design, Synthesis, and Structure-Activity Relationships of Thiazole Analogs as Anticholinesterase Agents for Alzheimer's Disease.

Dementia is a neurological condition commonly correlated with Alzheimer's disease (AD), and it is seen with many other central nervous system (CNS) disorders. The restricted number of medications is not appropriate to offer enough relief to enhance the quality of life of patients suffering from this symptom; thus, all therapeutic choices should be carefully assessed. In this study, new thiazolylhydrazone derivatives (-) were designed and synthesized based on the cholinergic hypothesis.

Synthesis, anticancer evaluation and molecular docking studies of new benzimidazole- 1,3,4-oxadiazole derivatives as human topoisomerase types I poison.

In this study, some benzimidazole-oxadiazole derivatives were synthesised and tested for their anticancer activities on five cancer cell lines, including HeLa, MCF7, A549, HepG2 and C6. Their structures were elucidated by IR, H-NMR, C-NMR, 2 D-NMR and HRMS spectroscopic methods. Among all screened compounds; , , , , , , and exhibited potent selective cytotoxic activities against various tested cancer cell lines.

Synthesis, investigation of biological effects and in silico studies of new benzimidazole derivatives as aromatase inhibitors.

Inhibition of aromatase enzymes is very important in the prevention of estrogen-related diseases and the regulation of estrogen levels. Aromatase enzyme is involved in the final stage of the biosynthesis of estrogen, in the conversion of androgens to estrogen. The development of new compounds for the inhibition of aromatase enzymes is an important area for medicinal chemists in this respect.

Synthesis, enzyme activity and molecular docking studies of new benzylamine-sulfonamide derivatives as selective MAO-B inhibitors.

Many studies have been conducted on the selective inhibition of human monoamine oxidase B (MAO-B) enzyme using benzylamine-sulphonamide derivatives. Using various chemical modifications on , which was reported previously by our team and showed a significant level of MAO-B inhibition, novel benzylamine-sulphonamide derivatives were designed, synthesised, and their MAO inhibition potentials were evaluated. Among the tested derivatives, compounds and achieved IC values of 0.

Synthesis and biological evaluation of novel 1,3,4-thiadiazole derivatives as possible anticancer agents.

The synthesis of new N-(5-substituted-1,3,4-thiadiazol-2-yl)-2-[(5-(substituted amino)-1,3,4-thiadiazol-2-yl)thio]acetamide derivatives and investigation of their anticancer activities were the aims of this work. All the new compounds' structures were elucidated by elemental analyses, IR, 1H NMR, 13C NMR and MS spectral data. Anticancer activity studies of the compounds were evaluated against MCF-7 and A549 tumor cell lines.

Synthesis, characterization and carbonic anhydrase I and II inhibitory evaluation of new sulfonamide derivatives bearing dithiocarbamate.

In this study, novel dithiocarbamate-sulfonamide derivatives (3a-3k) were synthesized to investigate their inhibitory activity on purified human carbonic anhydrase (hCA) I and II. The IC and K values of the compounds were calculated to compare their inhibition profiles on hCA I and II isoenzymes. Acetazolamide was used as the standard inhibitor in the enzyme inhibition assay.

Synthesis, Docking Studies and Biological Activity of New Benzimidazole- Triazolothiadiazine Derivatives as Aromatase Inhibitor.

In the last step of estrogen biosynthesis, aromatase enzyme catalyzes the conversion of androgens to estrogens. Aromatase inhibition is an important way to control estrogen-related diseases and estrogen levels. In this study, sixteen of benzimidazole-triazolothiadiazine derivatives have been synthesized and studied as potent aromatase inhibitors.

Synthesis and docking study of benzimidazole-triazolothiadiazine hybrids as aromatase inhibitors.

Aromatase is involved in the biosynthesis of estrogen and thus is a critical target for breast cancer. In this study, to identify new aromatase enzyme inhibitors, seven 3-[4-(5-methyl-1H-benzo[d]imidazol-2-yl)phenyl]-6-(substituted phenyl)-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazine derivatives were synthesized. First, a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was performed to determine the inhibitory activity of the synthesized compounds on the MCF-7 cell line.

Synthesis, molecular docking analysis and carbonic anhydrase I-II inhibitory evaluation of new sulfonamide derivatives.

New sulfonamide-hydrazone derivatives (3a-3n) were synthesized to evaluate their inhibitory effects on purified human carbonic anhydrase (hCA) I and II. The inhibition profiles of the synthesized compounds on hCA I-II isoenzyme were investigated by comparing their IC and K values. Acetazolamide (5-acetamido-1,3,4-thiadiazole-2-sulfonamide, AZA) has also been used as a standard inhibitor.

Synthesis and AChE Inhibitory Activity of Novel Thiazolylhydrazone Derivatives.

Alzheimer's disease (AD) is the most common of the degenerative brain diseases and is described together with the impairment of cognitive function. Patients with AD lose the capability to code new memories, and life conditions are extremely difficult. The development of new drugs in this area continues at a great pace.

Synthesis and AChE-Inhibitory Activity of New Benzimidazole Derivatives.

Alzheimer's disease (AD), one of the main causes of aged dementia, is a progressive and degenerative neurological disorder characterized by loss of cognition and memory. Although the symptomatic treatment of AD, particularly acetylcholinesterase inhibitors (AChEIs) based on the 'cholinergic hypothesis', has been successful in clinic, at present there is no cure for this disease. In this study, we designed compounds carrying benzimidazole and triazole rings on the same chemical skeleton so as to investigate their potential acetylcholinesterase and butyrylcholinesterase activity.

Synthesis and Antifungal Potential of Some Novel Benzimidazole-1,3,4-Oxadiazole Compounds.

Discovery of novel anticandidal agents with clarified mechanisms of action, could be a rationalist approach against diverse pathogenic fungal strains due to the rise of resistance to existing drugs. In support to this hypothesis, in this paper, a series of benzimidazole-oxadiazole compounds were synthesized and subjected to antifungal activity evaluation. In vitro activity assays indicated that some of the compounds exhibited moderate to potent antifungal activities against tested species when compared positive control amphotericin B and ketoconazole.

In vitro and in silico evaluation of new thiazole compounds as monoamine oxidase inhibitors.

New twenty compounds bearing thiazole ring (3a-3t) were designed and synthesized as monoamine oxidase (MAO) inhibitors. The fluorometric enzyme inhibition assay was used to determine the biological effects of synthesized compounds. Most of them showed remarkable inhibitory activity against both MAO-A and MAO-B.

Synthesis and Evaluation of New 1,3,4-Thiadiazole Derivatives as Potent Antifungal Agents.

With the goal of obtaining a novel bioactive compound with significant antifungal activity, a series of 1,3,4-thiadiazole derivatives (⁻) were synthesized and characterized. Due to thione-thiol tautomerism in the intermediate compound , type of substitution reaction in the final step was determined by two-dimensional (2D) NMR. In vitro antifungal activity of the synthesized compounds was evaluated against eight species.

Synthesis and Anticandidal Activity of New Imidazole-Chalcones.

In the present work, 15 new 1-(4-(1-imidazol-1-yl)phenyl)-3-(4-substituedphenyl)prop-2-en-1-one derivatives (−) were synthesized to evaluate their antifungal activity. Structures of newly synthesized imidazole derivatives (−) were characterized by IR, ¹H-NMR, C-NMR, and LCMSMS spectroscopic methods. The anticandidal activity of compounds (−) against (ATCC 24433), (ATCC 6258), (ATCC 22019), and (ATCC 90030) was elucidated according to the EUCAST definitive (EDef 7.

Synthesis and Evaluation of Heterocycles Based Chalcone Derivatives as Antiproliferative Agents.

Background: The lack of selectivity and development of drug-resistance encourage researchers to search for novel, more efficient and multi-targeted agents with less toxicity.

Objective: In this paper, a series of novel chalcone derivatives bearing diverse heterocycles have been synthesized and evaluated for their antiproliferative activity against A549 (Human Lung Adenocarcinoma) and C6 (Rat Brain Glioma) cells.

Method: Structures of the title compounds (3-18) were verified by FT-IR, 1H NMR, 13C NMR, HRMS spectral data and elemental analyses.

Synthesis and Biological Evaluation of New Thiosemicarbazone Derivative Schiff Bases as Monoamine Oxidase Inhibitory Agents.

Twenty-six novel thiosemicarbazone derivative - were synthesized via condensation reactions between the corresponding thiosemicarbazides and aldehydes. The chemical characterization of the compounds was carried out by infrared (IR), mass (MS), proton and carbon nuclear magnetic resonance (¹H- and C-NMR) spectroscopic analyses. The compounds were investigated for their monoamine oxidase A (MAO-A) and monoamine oxidase B (MAO-B) inhibitory activity and most of them were more potent against MAO-A enzyme when compared with MAO-B enzyme.

The synthesis, antifungal and apoptotic effects of triazole-oxadiazoles against Candida species.

In search of potent and safe antifungal agents, herein, we report the synthesis, characterization and biological activities of triazole-oxadiazole compounds. The structural verification of the molecules was carried out by H NMR, C NMR and mass spectral data. The in vitro antifungal and apoptotic activity were investigated against C.

Design and Synthesis of New Benzothiazole Compounds as Selective hMAO-B Inhibitors.

In the current work a new class of novel benzothiazole-hydrazone derivatives was designed and synthesized as MAO-B inhibitors. Structures of the obtained compounds (-) were characterized by IR, ¹H-NMR, C-NMR, and HRMS spectroscopic methods. The inhibitory activity of compounds (-) against MAO-A and MAO-B enzymes was evaluated by using an in vitro fluorometric method.