Reconciling the Gap between Medications and their Potential Leads: The Role of Marine Metabolites in the Discovery of New Anticancer Drugs: A Comprehensive Review

One-third of people will be diagnosed with cancer at some point in their lives, making it the second leading cause of death globally each year after cardiovascular disease. The complex anticancer molecular mechanisms have been understood clearly with the advent of improved genomic, proteomic, and bioinformatics. Our understanding of the complex interplay between numerous genes and regulatory genetic components within cells explaining how this might lead to malignant phenotypes has greatly expanded. It was discovered that epigenetic resistance and a lack of multitargeting drugs were highlighted as major barriers to cancer treatment, spurring the search for innovative anticancer treatments. It was discovered that epigenetic resistance and a lack of multitargeting drugs were highlighted as major barriers to cancer treatment, spurring the search for innovative anticancer treatments. Many popular anticancer drugs, including irinotecan, vincristine, etoposide, and paclitaxel, have botanical origins. Actinomycin D and mitomycin C come from bacteria, while bleomycin and curacin come from marine creatures. However, there is a lack of research evaluating the potential of algae-based anticancer treatments, especially in terms of their molecular mechanisms. Despite increasing interest in the former, and the promise of the compounds to treat tumours that have been resistant to existing treatment, pharmaceutical development of these compounds has lagged. Thus, the current review focuses on the key algal sources that have been exploited as anticancer therapeutic leads, including their biological origins, phytochemistry, and the challenges involved in converting such leads into effective anticancer drugs.

Camphor and Menthol as Anticancer Agents: Synthesis, Structure-Activity Relationship and Interaction with Cancer Cell Lines

Cancer is a type of human cell degenerative disease that has afflicted a large number of people for years. Cancer is caused due to the abnormal proliferation of cells in any part of the body. Most of the prescribed anticancer drugs are synthetic in nature and have been reported with enormous adverse effects. The researchers are very much enthusiastic about the use of natural compounds and their derivatives, which have been reported with less toxicity. Natural compounds have emerged as promising synergistic compounds with potential anticancer effects. In vitro anticancer activity of natural compounds with special reference to camphor and menthol has been investigated against different cancer cell lines. It has been found that camphor and menthol derivatives have potential cytotoxic activity. The present literature review outlines the various methods for the synthesis of camphor and menthol derivatives, which have potential cytotoxic activity. It highlights various cancer cell lines, which are the target of these camphor and menthol derivatives as ligands, along with structure-activity studies.

Insight into the Synthesis, Biological Activity, and Structure-activity Relationship of Benzothiazole and Benzothiazole-hydrazone Derivatives: A Comprehensive Review

Heterocyclic compounds constitute the most important part of medicinal as well as organic chemistry. Most of the marketed drugs possess therapeutic activity because of the presence of heterocyclic scaffolds as part of their structure. A slight change in the structure of the heterocyclic moieties may result in a major change in the therapeutic response of the drug candidate. Among all heterocycle compounds, the compounds containing nitrogen and sulfur atoms serve as a unique resource for drug development, such as benzothiazoles. Benzothiazole is a benzofused heterocyclic that is widely reported as a constituent of naturally occurring chemicals and chiefly responsible for their pharmacological potential. It was also reported that the pharmacological activity of BTA may also be influenced by its coupling with aldehydes, ketones, or hydrazines to form respected benzothiazole-hydrazone derivatives. The present comprehensive review consists of various synthesis methods, biological activities, and structure-activity relationships of and targets of benzothiazole and benzothiazole-hydrazone derivatives to provide a wide range of information to medicinal chemists for future research work.

An Insight into Diverse Activities and Targets of Flavonoids

BACKGROUND

Flavonoids belong to the chemical class of polyphenols and are in the category of secondary metabolites imparting a wide protective effect against acute and chronic diseases.

OBJECTIVE

The study aims to investigate and summarize the information of various flavonoids extracted, isolated from various sources, and possess different pharmacological properties by acting on multiple targets.

METHODS

This comprehensive review summarizes the research information related to flavonoids and their pharmacological action targets from various sources like PubMed, Google Scholar and Google websites.

RESULTS

Extracted information in the paper discusses various therapeutic effects of flavonoids isolated from medicinal plant sources, which have the property to inhibit several enzymes, which finally results in health benefits like anti-cancer, anti-bacterial, antioxidant, anti-allergic, and anti-viral effects. This study also showed the different solvents and methods involved in the extraction and characterization of the isolated phytochemical constituents.

CONCLUSION

The findings showed the contribution of several flavonoids in the management and inhibition of various acute and chronic sicknesses by acting on different sites in the body. This study may lead to gaining interest for more research on the bioactives of different medicinal plants for the discovery of new lead compounds or further improvement of the efficacy of the existing compound.

A Comprehensive Review of the Pharmacological Importance of Dietary Flavonoids as Hepatoprotective Agents

The liver is a crucial organ that is involved in various kinds of metabolic activity and a very stable accessory gland for the digestive system. Long-term or persistent inflammation and oxidative stress due to any reasons have a substantial impact on the beginning and continuation of chronic diseases such as hepatocellular carcinoma, liver cirrhosis, liver fibrosis, and other hepatic conditions. There are many sources which can help the liver to be healthy and enhance its metabolic potential of the liver. Since the diet is rich origin of bioactive along with antioxidant chemicals including flavonoids and polyphenols, it can control different stages of inflammation and hepatic diseases. Numerous food sources, notably vegetables, nuts, fruits, cereals, beverages, and herbal medicinal plants, are rich in bioactive chemicals called flavonoids and their derivatives like Flavones, Anthocyanins, Iso-flavonoid, Flavanones, Flavanols, and Flavan-3-ols. Most recently occurred research on flavonoids has demonstrated that they can regulate hepatoprotective properties. This is because they are essential parts of pharmaceutical and nutraceutical products due to their hepatoprotective, antioxidative, and immune-modulating characteristics. However, the characteristics of their hepatoprotective impact remain unclear. The purpose of this comprehensive review is to survey the flavonoid structure and enriched sources for their hepatoprotective and antioxidant effects concerning liver toxicity or injury.

Significant Advancement in Various Synthetic Strategies and Pharmacotherapy of Piperine Derivatives: A Review

BACKGROUND

Piperine is a natural compound found in black pepper that has been traditionally used for various therapeutic purposes. In the ayurvedic system of medication there is a lot of evidence which shows that the piperine is widely used for different therapeutic purpose. In recent years, there has been an increasing interest in the pharmacological and therapeutic potential of piperine and its derivatives in modern medicine. In order to increase the bioavailability and therapeutic effectiveness of piperine and its analogs, researchers have been looking at various extraction methods and synthesis approaches. Many studies have been conducted in this area because of the promise of piperine as a natural substitute for synthetic medications.

OBJECTIVES

The objective of this review article is to provide an up-to-date analysis of the literature on the synthesis of piperine analogs, including their extraction techniques and various biological activities such as antihypertensive, antidiabetic, insecticidal, antimicrobial, and antibiotic effects. Additionally, the review aims to discuss the potential of piperine in modern medicine, given its traditional use in various medicinal systems such as Ayurveda, Siddha, and Unani. The article also provides a comprehensive analysis of the plant from which piperine is derived.

CONCLUSION

This review article provides a thorough examination of piperine and the source plant. The best extraction technique for the extraction of piperine and the synthesis of its analogs with various biological activities, including antihypertensive, antidiabetic, insecticidal, antibacterial, and antibiotic properties, are covered in the article. This review aims to provide an updated analysis of the literature on the synthesis of piperine analogs.

Investigating Neuroprotective Potential of Berberine, Levetiracetam and their Combination in the Management of Alzheimer's Disease Utilizing Drug Repurposing Strategy

AIM

The aim of the present work was to evaluate the neuroprotective potential of berberine, levetiracetam and their combination in lead acetate-induced neurotoxicity by applying a drug repositioning approach.

BACKGROUND

Alzheimer's disease (AD) is a neurodegenerative disease characterized by impairment of memory, disturbances in reasoning, planning, language and perception. Currently, there are only four drugs approved by US-FDA for AD; therefore, there is an extensive need for new drug development. The drug repositioning approach refers to the development of new uses for existing or abandoned pharmaceuticals. Several studies support the neuroprotective abilities of anti-oxidants resulting in neuronal protection against neurotoxins, suppression of oxidative stress and promotion of memory, learning and cognitive functions. Many natural polyphenols are being investigated as a potential therapeutic option for AD. Levetiracetam (LEV), a second-generation antiepileptic drug, is a new molecule that is clearly differentiated from conventional antiepileptic drugs by its pharmacologic properties. LEV also has been previously demonstrated to protect against oxidative stress-induced neurotoxicity in several models of seizures. Berberine (BBR) is an anti-inflammatory and anti-oxidant phytoconstituent.

OBJECTIVE

To study the therapeutic effect of berberine, levetiracetam and their physical mixture in lead acetate-induced neurotoxicity in Swiss albino mice for probable application in the management of Alzheimer's disease.

METHODS

Neurotoxicity was induced in Swiss albino mice by lead acetate. Behavioural parameters, such as transfer latency time and percentage alternation, were studied using Morris water maze (MWM), Elevated plus-maze test (EPM) and Y-maze for the assessment of improvement in learning and memory. Concentrations of acetylcholinesterase, MDA and GSH in the brain were also estimated. Brain samples were subjected to histopathological studies.

RESULTS

Results revealed that the combination of BBR and LEV exhibited a significant neuroprotective effect by decreasing escape latency time and increasing time spent in the target quadrant in MWM. The combination also decreases transfer latency time in EPM and acetylcholinesterase levels in the brain as compared to standard donepezil. Reduced neuronal damage was also confirmed by the histopathological report.

CONCLUSION

Leveteracitam, berberin and their combination resulted in the significant conservation of various behavioural, biochemical, enzymatic and anti-oxidant parameters that were evaluated. The neuroprotective effect of plain leveteracitam and berberin was significantly better than their combination. The anticipated synergism or additive effect was not observed with the combination of leveteracitam and berberin in lead acetate-induced neurotoxicity.

Molecular Target Interactions of Quinoline Derivatives as Anticancer Agents: A Review

One of the leading causes of death worldwide is cancer, which poses substantial risks to both society and an individual's life. Cancer therapy is still challenging, despite developments in the field and continued research into cancer prevention. The search for novel anticancer active agents with a broader cytotoxicity range is therefore continuously ongoing. The benzene ring gets fused to a pyridine ring at two carbon atoms close to one another to form the double ring structure of the heterocyclic aromatic nitrogen molecule known as quinoline (1-azanaphthalene). Quinoline derivatives contain a wide range of pharmacological activities, including antitubercular, antifungal, antibacterial, and antimalarial properties. Quinoline derivatives have also been shown to have anticancer properties. There are many quinoline derivatives widely available as anticancer drugs that act via a variety of mechanisms on various molecular targets, such as inhibition of topoisomerase, inhibition of tyrosine kinases, inhibition of heat shock protein 90 (Hsp90), inhibition of histone deacetylases (HDACs), inhibition of cell cycle arrest and apoptosis, and inhibition of tubulin polymerization.

Insight Into the various approaches for the enhancement of bioavailability and pharmacological potency of terpenoids: A Review

Abstract:

Terpenoids are naturally occurring secondary metabolites that consist of isoprene units (i.e., 2-methyl-1,3-butadiene). Terpenoids became recognized because of their diverse pharmacological benefits, such as anti-cancer, anti-inflammatory, antioxidant, analgesic, antibacterial, antifungal, hepatoprotective, antiviral, and antiparasitic activities. But most of these compounds have limited lipophilicity, dissolution rate, aqueous solubility, and drug permeability, so they are not used effectively. The low bioavailability significantly interferes with the performance of terpenoids to cure diseases, and the absorption process of terpenoids also becomes disrupted; therefore, their bioavailability in the blood becomes insufficient to achieve optimal treatment activity. Thus, to overcome this limitation, some strategies are used, such as nanotechnology (nanoparticles, carrier complexation), cocrystal, and glycosylation. Thus, this review summarizes the chemistry of terpenoids, factors that limit the bioavailability of terpenoids, and strategies employed to date with their design principles and outcomes possibly increasing their bioactivity.

Review on the discovery of new Benzimidazole derivatives as Anticancer Agents: Synthesis and Structure-Activity Relationship (2010-2022)

Background:

Benzimidazole (Benz-fused bicyclic ring system) is the most versatile class of heterocyclic compounds due to their numerous applications in industrial and synthetic organic chemistry because of its many biological actions. Benzimidazole analogs have been utilized to discover a variety of medical problems, such as cancer, bacterial infections, fungal infections, etc. Nitrogen-containing hybrid heterocyclic compounds are being studied by researchers because it provides a broad range of therapeutic potential and has minimal side effects.

Objective:

The current review of the literature emphasizes recent developments in the design of new benzimidazole derivatives as possible anticancer agents with their relationship between structure and activity, which will give insight into the future design of more active benzimidazole molecules.

Result and Conclusion:

The present review consists of synthetic protocols for the synthesis of benzimidazole derivatives along with their pharmacological potentials and structure-activity relationship in correlation with synthetic molecules to provide a depth view of the work done on benzimidazole. It would be significant for further research in the development of better drug molecules representing a potent derivative of medicinal agents.

Recent Updates on Synthesis, Biological Activity, and Structure-Activity Relationship of 1,3,4-oxadiazole-Quinoline Hybrids: A Review

Due to their diverse applications in industrial and synthetic organic chemistry, quinoline and 1,3,4-oxadiazole have become important heterocyclic compounds. Quinoline and 1,3,4-oxadiazole compounds have been developed for various medical conditions such as anti-cancer, anti-bacterial, anti-fungal, antimalarial, antioxidants, anti-HIV, anticonvulsant, antiviral, etc. The current review includes synthetic protocols for biologically active 1,3,4-oxadiazole incorporating quinoline hybrids with their structure-activity relationship to explore work (Mainly from 2010 to 2021) based on 1,3,4-oxadiazole-quinoline hybrids to the medicinal chemist for further research in the development of the molecule.

Multiple Cancer Combating by Natural Bioactives: A Review

Background:

Significant progress in the field of anticancer research has led to a rise in the study of bioactive chemicals with potential anticancer effects. Still, many bioactive natural chemicals must be investigated in order to generate more effective anti-cancer therapeutics.

Outline:

There have been many attempts to treat cancer, and this review summarizes many bioactive substances obtained from nature that have the ability to fight against different types of malignancies with minimal harm, based on diverse research. Polyphenolic flavonoids, carotenoid (fucoxanthin), tannin, and other notable natural bioactive with anticancer potential were examined and reviewed systematically with an eye toward their significance in many types of cancer treatment.

Conclusion:

Throughout the text, it was concluded that the natural bioactive play a very prominent role in combating different types of cancer, and the information related to the bioactive role in cancer treatment over the last 10 years was gathered from several research and review articles. The material kept in this paper can act as a template for future research in expressing the more beneficial role of other bioactive in acting as an adjuvant in chemotherapy practice for prevention and treatment of various cancer additionally with no or minimal adverse effects which are prominent with the conventional drugs used for the treatment of cancer.

Updates on the Synthetic Strategies and Structure-Activity Relationship of Anticonvulsant Benzothiazole and Benzimidazole Derivatives

Abstract:

Epilepsy is a chronic neurological disorder, characterized by periodic and unpredictable seizures affecting the neurobiological, psychological, cognitive, economic, and social well-being of patients. It is one of the causes of concern in developed as well as in developing countries as currently marketed drugs are not capable to provide protection against it. Although several heterocyclic moieties have been frequently used as building blocks for the preparation of anticonvulsant drugs, more focused and consistent research on the synthesis of potential molecules with less adverse effects is needed of the hour. It can be concluded on the basis of available research reports that among several heterocyclic compounds, benzo-fused five-membered heterocyclic moieties (benzothiazole and benzimidazole) have been utilized far less than their great potential as building blocks for the synthesis of anticonvulsant drugs. Various reports clearly established that the required pharmacophore model could be easily achieved through benzothiazole and benzimidazole moieties as two hetero atoms and aryl rings are present in the structure. The present study highlights various synthetic approaches for anticonvulsant benzothiazole and benzimidazole derivatives with their structure-activity relationship studies, in order to provide a trove of knowledge to medicinal chemists for future research.

In-Silico and In-Vitro Screening of Novel Pyridazine Analogs as Muscle Relaxant Agent on Acetylcholine Muscarinic Receptor

Background:

Among Nitrogen-containing heterocyclic compounds, pyridazine derivatives serve as a necessary scaffold as they possess various pharmacological activities. Thus, in recent times, the design of novel synthetic schemes and the selection of a new target for the action of pyridazine derivatives have attracted the attention of researchers.

Objective:

This study has focused on synthesizing and evaluating the muscle relaxant activity of pyridazine analogs by in-silico screening and rotarod test.

Methods:

In the present work, pyridazine derivatives were synthesized from substituted pyridine and maleic anhydride yielding intermediates (1a-5a) which on reaction with hydrazine yielded final pyridazine derivatives(1b-5b). They were then screened for muscle relaxant action by an in-silico docking study against muscarinic acetylcholine receptors with protein data bank ID: 5CXV with the use of Autodock 4.2 and Biovia discovery studio tools. Compounds were further tested for muscle relaxant activity by the rotarod test

Results:

Synthesis of the designed compounds was carried out successfully. Obtained result showed that the final compounds (1b-5b) showed 1-3 interactions with acetylcholine muscarinic receptor with -7.2 to -7.9 Kcal/mole affinities. The findings were compared to the typical drug diazepam, which has one interaction with the target and binding energy of -7.7 Kcal/mole. Moreover, the result of the rotarod test showed that substitution by electron-withdrawing groups causes more muscle relaxant activity when compared with the electron releasing groups

Conclusion:

The results of the experimental study showed that pyridazine derivatives could serve as a promising template for the further design and development of muscle relaxant agents.

A Review Exploring Synthetic Strategies for Psychologically useful Oxadiazole Derivatives

Abstract:

Oxadiazole is a five-membered aromatic heterocyclic ring having two nitrogen and one oxygen atom. Various isomeric forms have been reported for oxadiazole, such as 1,3,4-oxadiazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, etc. In the current time, a considerable population worldwide is facing several mental problems due to a competitive lifestyle. The present status of available medicines doesn’t promise for complete cure without any adverse effects. So, these disorders are continuously challenging the researchers for coming with new molecules with superior efficacy and minimum side effects. All the isomeric forms of oxadiazole have numerous potential in treating various mental problems such as parkinsonism, alzheimer, schizophrenia, and epileptic disorders. In this review article, we summarize several recently reported synthetic strategies for preparing different oxadiazole and its derivatives which were found effective in psychological disorders. The researchers will get all the valuable information (synthesis strategies) for their future research in discovering new molecules with oxadiazole moiety. Furthermore, this review article will help the researchers in the fight against mental disorders and give a new light for mentally challenged people.

Insights into Interactions of Human Cytochrome P450 17A1: Review

Abstract:

Cytochrome P450s are a widespread and vast superfamily of hemeprotein monooxygenases that metabolize physiologically essential chemicals necessary for most species' survival, from protists to plants to humans. They catalyze the synthesis of steroid hormones, cholesterol, bile acids, and arachidonate metabolites and the degradation of endogenous compounds such as steroids, fatty acids, and other catabolizing compounds as an energy source and detoxifying xenobiotics such as drugs, procarcinogens, and carcinogens. The human CYP17A1 is one of the cytochrome P450 genes located at the 10q chromosome. The gene expression occurs in the adrenals and gonads, with minor amounts in the brain, placenta, and heart. This P450c17 cytochrome gene is a critical steroidogenesis regulator which performs two distinct activities: 17 alpha-hydroxylase activity (converting pregnenolone to 17-hydroxypregnenolone and progesterone to 17-hydroxyprogesterone, these precursors are further processed to provide glucocorticoids and sex hormones) and 17, 20-lyase activity (which converts 17-hydroxypregnenolone to DHEA). Dozens of mutations within CYP17A1 are found to cause 17-alpha-hydroxylase and 17, 20-lyase deficiency. This condition affects the function of certain hormone-producing glands, resulting in high blood pressure levels (hypertension), abnormal sexual development, and other deficiency diseases. This review highlights the changes in CYP17A1 associated with gene-gene interaction, drug-gene interaction, chemical-gene interaction, and its biochemical reactions; they have some insights to correlate with the fascinating functional characteristics of this human steroidogenic gene. The findings of our theoretical results will be helpful to further the design of specific inhibitors of CYP17A1.

Synthetic Strategies of Pyrazoline Derivatives for the Development of New Anticancer Agents: Recent Updates

Background:

Pyrazoline is a heterocyclic compound of five rings, three carbon atoms, and two nitrogen atoms in a circle with just one endocyclic bond. Pyrazoline is one form of electron-rich nitrogen carrier, gaining popularity because it combines exciting electronic properties with the potential for dynamic applications. Many methods have been used in this research to synthesize pyrazoline derivatives to show a highly biological effect.

Objective:

The research of pyrazoline derivatives' biological activity has been a fascinating area of pharmaceutical chemistry. Pyrazolines are used in multifunctional applications. The current review of pyrazoline derivatives patent literature (2000-2021) describing the introduction, general method, and synthetic scheme on Anticancer activity has been discussed.

Conclusion:

Pyrazolines is a known heterocyclic compound. Pyrazoline is a five-membered ring containing three carbon and two nitrogen atoms nearby. Many approaches can be used to figure out their Synthesis. Numerous pyrazoline derivatives have been discovered to have an essential biological effect on anticancer activity, which has encouraged research in this area. The use of pyrazoline against cancer is a brilliant moiety and has an enormous scope of interest for the researchers to search more about this moiety.

Benzothiazole: Synthetic Strategies, Biological Potential, and Interactions with Targets

:

Benzothiazole is a heterocyclic compound that contains a benzene ring fused with a five-member 1,3-thiazole ring. Several types of research have established its potential as an antimicrobial agent, anticancer agent, anti-epileptic agent, antiviral agent, etc. Nowadays, various effective drugs utilize the hybridization of two or more pharmacophores in a single-molecule for synergizing its pharmacological action or to interact with more than one target or to reduce the side effects associated with it. In this article, various strategies for the synthesis of different pharmacologically active hybrid compounds containing benzothiazole with different substituents are highlighted. Apart from presenting the synthesis strategies, the article also highlights various pharmacological actions and molecular interactions with different biological molecules of the potential drugs containing benzothiazole.

Comprehensive Review on Synthetic Approaches and Biological Activities of 1,3,4-Oxadiazole

Abstract:

Among the large variety of nitrogen and oxygen heterocycles, 1,3,4-oxadiazole, the scaffold, has attracted considerable attention owing to its ability to showing an extensive range of pharmacological actions. Therefore, significant efforts of organic chemists have been directed towards the construction of new drug candidates containing 1,3,4-oxadiazole subunits connected to a known pharmaceutical or a potential pharmacophore. This digest highlights recent publications on the various synthesis techniques of 1,3,4-oxadiazole and related compounds over the previous ten years (2011–2021). The purpose of this review is to learn about several ways for synthesizing oxadiazole. These heterocyclics are formed mainly by the cyclization reactions of various reactants under diverse circumstances. According to the literature investigations, they were given a high priority for their pharmacological significance, such as anticonvulsant, anticancer, antioxidant, anti-inflammatory, antibacterial, antidiabetic, etc.

In Vitro and In Vivo Approaches for Screening the Potential of Anticancer Agents: A Review

BACKGROUND

Anticancer drug development is a tedious process, requiring several in vitro, in vivo, and clinical studies. In order to avoid chemical toxicity in animals during an experiment, it is necessary to envisage toxic doses of screened drugs in vivo at different concentrations. Several in vitro and in vivo studies have been reported to discover the management of cancer.

MATERIALS AND METHODS

This study focused on bringing together a wide range of in vivo and in vitro assay methods developed to evaluate each hallmark feature of cancer.

RESULT

This review provides detailed information on target-based and cell-based screening of new anticancer drugs in the molecular targeting period. This would help in inciting an alteration from the preclinical screening of pragmatic compound-orientated to target-orientated drug selection.

CONCLUSION

Selection methodologies for finding anticancer activity have importance for tumor- specific agents. In this study, advanced rationalization of the cell-based assay is explored along with broad applications of the cell-based methodologies considering other opportunities.

Recent updates on Synthetic Strategies and Biological Potential of 1,3,4-oxadiazole: Review

Abstract:

Among the large variety of nitrogen and oxygen-containing heterocycles, 1,3,4-oxadiazole, the scaffold, has attracted considerable attention owing to its ability to show an extensive range of pharmacological actions. According to literature investigations, prepared 1,3,4-oxadiazole and its derivative are pharmacologically significant and consist of a variety of activities, such as anticonvulsant, anticancer, antioxidant, anti-inflammatory, antibacterial, antidiabetic, etc. These heterocyclics are formed mainly by the cyclization reactions of various reactants under diverse reaction circumstances. Therefore, significant efforts of organic chemists have been directed towards the synthesis of new drug candidates containing 1,3,4-oxadiazole subunits connected to an established potential pharmacophore to improve the efficacy and potency. This article aims to highlight recent publications on the various synthesis techniques of 1,3,4-oxadiazole and related compounds over the previous ten years (2011–2021). The purpose of this review is to help researchers by summarizing several synthetic strategies for synthesizing oxadiazole.

Synthetic Approach to Potential Anticancer Benzimidazole Derivatives- A Review

Cancer is one of the deadliest diseases in many developed and developing countries. Continuous efforts are required for designing better therapeutic agents for the treatment of cancer with more efficacy, selectivity, and less toxicity. The fused heterocyclic ring system has been identified by several researchers as a privileged structure that can be used as a basis for drug discovery in medicinal chemistry. The hetero-aromatic bicyclic ring system acts as a pharmacophore in a wide range of drugs with therapeutic potential. According to studies in the literature, variously substituted benzimidazoles have distinct pharmacological profiles with multi-targeting ability, making them an important anchor for the production of novel therapeutic agents against complex cancers including breast cancer, skin cancer, and blood cancer. In this presented article we are discussed various synthetic methods for the synthesis of anticancer benzimidazoles and their derivatives in different solvent conditions, substrates, and various catalysts mainly those which are eco-friendly, and economical, which shows the anticancer activity. We also focused on various derivatives are under clinical trials containing Benzimidazole moiety.