Semaglutide, a glucagon like peptide-1 receptor agonist with cardiovascular benefits for management of type 2 diabetes.

Semaglutide, a glucagon like peptide-1 (GLP-1) receptor agonist, is available as monotherapy in both subcutaneous as well as oral dosage form (first approved oral GLP-1 receptor agonist). It has been approved as a second line treatment option for better glycaemic control in type 2 diabetes and currently under scrutiny for anti-obesity purpose. Semaglutide has been proved to be safe in adults and elderly patients with renal or hepatic disorders demanding no dose modification. Cardiovascular (CV) outcome trials established that it can reduce various CV risk factors in patients with established CV disorders. Semaglutide is well tolerated with no risk of hypoglycaemia in monotherapy but suffers from gastrointestinal adverse effects. A large population affected with COVID-19 infection were diabetic; therefore use of semaglutide in diabetes as well as CV patients would be very much supportive in maintaining health care system during this pandemic situation. Hence, this peptidic drug can be truly considered as a quintessential of GLP-1 agonists for management of type 2 diabetes.

Green Synthetic Approach: An Efficient Eco-Friendly Tool for Synthesis of Biologically Active Oxadiazole Derivatives.

Green synthetic protocol refers to the development of processes for the sustainable production of chemicals and materials. For the synthesis of various biologically active compounds, energy-efficient and environmentally benign processes are applied, such as microwave irradiation technology, ultrasound-mediated synthesis, photo-catalysis (ultraviolet, visible and infrared irradiation), molecular sieving, grinding and milling techniques, etc. Thesemethods are considered sustainable technology and become valuable green protocol to synthesize new drug molecules as theyprovidenumerous benefits over conventional synthetic methods.Based on this concept, oxadiazole derivatives are synthesized under microwave irradiation technique to reduce the formation of byproduct so that the product yield can be increased quantitatively in less reaction time. Hence, the synthesis of drug molecules under microwave irradiation follows a green chemistry approach that employs a set of principles to minimize or remove the utilization and production of hazardous toxic materials during the design, manufacture and application of chemical substances.This approach plays a major role in controlling environmental pollution by utilizing safer solvents, catalysts, suitable reaction conditions and thereby increases the atom economy and energy efficiency. Oxadiazole is a five-membered heterocyclic compound that possesses one oxygen and two nitrogen atoms in the ring system.Oxadiazole moiety is drawing considerable interest for the development of new drug candidates with potential therapeutic activities including antibacterial, antifungal, antiviral, anticonvulsant, anticancer, antimalarial, antitubercular, anti-asthmatic, antidepressant, antidiabetic, antioxidant, antiparkinsonian, analgesic and antiinflammatory, etc. This review focuses on different synthetic approaches of oxadiazole derivatives under microwave heating method and study of their various biological activities.

Current Insights into Therapeutic Potential of Terpenoids as Anticancer Agents.

BACKGROUND: Cancer is regarded as one of the main causes of death globally. Future predictions indicate that the death rate from cancer will keep rising, which may reach 11.4 million in 2030. Carcinogenesis refers to the phenomenon of transforming a normal cell into a cancer cell. Cancer is characterized by unregulated and uncontrolled cell division due to alterations at the molecular and genetic levels. Gene mutations can speed up the rate of cell division, which leads to cancer. Metastasis entails the dissemination of cancer cells from the primary site to distant regions of the body via the circulatory or lymphatic systems. OBJECTIVE: This review is mainly focusing on the anticancer properties of terpenoids. In the case of human beings, several types of cancers can be treated clinically based on the form and phase of the cancer. So, there are different types of treatment regimens available for the management of cancer, such as immunotherapy, hormonal therapy, radiation therapy, and chemotherapy. METHODS: Several problems are associated with cancer therapy, including chemoresistance, severe toxicity, relapse, and metastasis. To minimize these complications, natural products like terpenoids seem to be beneficial for the effective management of cancer. RESULTS: Experimental results revealed that the anticancer potential of terpenoids is due to activation of apoptosis and stimulation of cell cycle arrest. Some of the terpenoids exhibit anticancer effects by inhibiting angiogenesis and metastasis via the regulation of several signaling pathways intracellularly. Certain terpenoids have been shown to work in concert with anticancer medications (doxorubicin, cisplatin, paclitaxel, and 5-fluorouracil) to provide synergistic effects. These terpenoids have also been shown to be effective against cancer cells that are resistant to several drug therapies. CONCLUSION: The current study will focus on signaling pathways and mode of action of several types of terpenoids as anticancer agents. Further, it will provide insights into the ongoing clinical trials and prospective pathways for the advancement of terpenoids as possible anti-cancer agents.

Applications of nanotechnology-mediated herbal nanosystems for ophthalmic drug.

In recent years, herbal nanomedicines have gained tremendous popularity for novel drug discovery. Nanotechnology has provided several advances in the healthcare sector, emerging several novel nanocarriers that potentiate the bioavailability and therapeutic efficacy of the herbal drug. The recent advances in nanotechnology with accelerated strategies of ophthalmic nanosystems have paved a new path for overcoming the limitations associated with ocular drug delivery systems, such as low bioavailability, poor absorption, stability, and precorneal drug loss. Ophthalmic drug delivery is challenging due to anatomical and physiological barriers. Due to the presence of these barriers, the herbal drug entry into the eyes can be affected when administered by following multiple routes, i.e., topical, injectables, or systemic. However, the advancement of nanotechnology with intelligent systems enables the herbal active constituent to successfully entrap within the system, which is usually difficult to reach employing conventional herbal formulations. Herbal-loaded nanocarrier drug delivery systems demonstrated enhanced herbal drug permeation and prolonged herbal drug delivery. In this current manuscript, an extensive search is conducted for original research papers using databases Viz., PubMed, Google Scholar, Science Direct, Web of Science, etc. Further painstaking efforts are made to compile and update the novel herbal nanocarriers such as liposomes, polymeric nanoparticles, solid lipid nanoparticles, nanostructure lipid carriers, micelles, niosomes, nanoemulsions, dendrimers, etc., which are mostly used for ophthalmic drug delivery system. This article presents a comprehensive survey of diverse applications used for the preventative measures and treatment therapy of varied eye disorders. Further, this article highlights the recent findings that the innovators are exclusively working on ophthalmic nanosystems for herbal drug delivery systems. The nanocarriers are promising drug delivery systems that enable an effective and supreme therapeutic potential circumventing the limitations associated with conventional ocular drug delivery systems. The nanotechnology-based approach is useful to encapsulate the herbal bioactive and prevent them from degradation and therefore providing them for controlled and sustained release with enhanced herbal drug permeation. Extensive research is still being carried out in the field of herbal nanotechnology to design an ophthalmic nanosystem with improved.

Biological Effects and Mechanisms of Taurine in Various Therapeutics.

More than two hundred years ago, taurine was first isolated from materials derived from animals. It is abundantly found in a wide range of mammalian and non-mammalian tissues and diverse environments. Taurine was discovered to be a by-product of the metabolism of sulfur only a little over a century and a half ago. Recently, there has been a renewed academic interest in researching and exploring various uses of the amino acid taurine, and recent research has indicated that it may be useful in the treatment of a variety of disorders, including seizures, high blood pressure, cardiac infarction, neurodegeneration, and diabetes. Taurine is currently authorised for the therapy of congestive heart failure in Japan, and it has shown promising results in the management of several other illnesses as well. Moreover, it was found to be effective in some clinical trials, and hence it was patented for the same. This review compiles the research data that supports the prospective usage of taurine as an antibacterial, antioxidant, anti-inflammatory, diabetic, retinal protective, and membrane stabilizing agent, amongst other applications.

Development And Validation Of Rp-Hplc Method For The Estimation Of Tenofovir And Emtricitabine In Bulk And Pharmaceutical Dosage Form.

BACKGROUND: A novel, simple, efficient, rapid, and precise reverse-phase high-performance liquid chromatography (RP-HPLC) method was developed for the estimation of Tenofovir and Emtricitabine in the bulk and pharmaceutical dosage form. The currently developed method was subsequently validated according to ICH guidelines in terms of linearity, accuracy, precision, the limit of detection, the limit of quantification, robustness, etc. Methods: The separation of the selected drugs was optimized after several trials including change of mobile phase and its composition, stationary phase, flow rate, column temperature, etc. The separation was performed by using an Inertsil ODS C18 column (250 mm x 4.6 mm, 5µ) and UV absorption was measured at 231 nm. Methanol: Acetonitrile: Water was selected as the mobile phase in the ratio of 50:20:30 (V/V/V) at a flow rate of 1 mL/min. As per International Conference on Harmonization (ICH) Q2 R1 guidelines, several validation parameters were evaluated which include specificity, linearity, precision, accuracy, the limit of detection (LOD), and the limit of quantitation (LOQ). RESULTS: The acceptable degree of linearity range was found to be 40-100 µg/mL. The standard solution exhibited retention times of 3.06 minutes and 5.07 minutes for Tenofovir and Emtricitabine respectively. The LOD and LOQ obtained were 0.05µg/ml and 0.02µg/mL, 15µg/mL, and 0.08µg/mL for Tenofovir and Emtricitabine respectively. The percent recovery was found to be 98 to 102%. CONCLUSION: Hence, the proposed method is simple, selective, and specifically meets the requirements of ICH guidelines for the validation of the analytical method.

Mechanistic Role of Tempol: Synthesis, Catalysed Reactions and Therapeutic Potential.

Tempol (TP) was introduced in 1960 by Lebedev and Kazarnovskii and is an excellent catalyst extensively used in the synthesis and oxidation of various reagents. 4-Hydroxy-2,2,6,6- tetramethylpiperidin-1-oxyl (TP) has also been explored against various disorders like inflammation, superoxide anion-influenced molecular linked behavioural modifications, radical capturing, cardioprotective, protective ocular damage, against skin burns, fibrocystic diseases, breast cancer prevention, respiratory infections, alopecia, and cerebral malaria, etc. This review article comprises five major aspects of TP namely (a) Approx. 25 different Synthesis schemes of TP (b) major reactions catalysed by TP (c) Therapeutic potential of TP. It also provides scientific information that supports the use of TP which may be proven as a "MIRACLE" drug for the treatment of numerous disorders namely in reducing the reactive oxygen species, superoxide mutases, vision disorders, cancer as well as in covid. It also possesses a significant role in minimising side effects in combination therapy. This review will be beneficial to researchers, healthcare, and academic professionals for further research.

NOX-2 Inhibitors may be Potential Drug Candidates for the Management of COVID-19 Complications.

COVID-19 is an RNA virus that attacks the targeting organs, which express angiotensin-converting enzyme-2 (ACE-2), such as the lungs, heart, renal system, and gastrointestinal tract. The virus that enters the cell by endocytosis triggers ROS production within the confines of endosomes via a NOX-2 containing NADPH-oxidase. Various isoforms of NADPH oxidase are expressed in airways and alveolar epithelial cells, endothelial and vascular smooth muscle cells, and inflammatory cells, such as alveolar macrophages, monocytes, neutrophils, and T-lymphocytes. The key NOX isoform expressed in macrophages and neutrophils is the NOX-2 oxidase, whereas, in airways and alveolar epithelial cells, it appears to be NOX-1 and NOX-2. The respiratory RNA viruses induce NOX-2-mediated ROS production in the endosomes of alveolar macrophages. The mitochondrial and NADPH oxidase (NOX) generated ROS can enhance TGF-ß signaling to promote fibrosis of the lungs. The endothelium-derived ROS and platelet-derived ROS, due to activation of the NADPH-oxidase enzyme, play a crucial role in platelet activation. It has been observed that NOX-2 is generally activated in COVID-19 patients. The post-COVID complications like pulmonary fibrosis and platelet aggregation may be due to the activation of NOX-2. NOX-2 inhibitors may be a useful drug candidate to prevent COVID-19 complications like pulmonary fibrosis and platelet aggregation.

Carbapenem Antibiotics: Recent Update on Synthesis and Pharmacological Activities.

Right from the breakthrough of carbapenems since 1976, many schemes on synthesis, structure-activity relationship (SAR), and biological activities have been carried out, and several carbapenems have been developed, including parentally active carbapenems like imipenem, doripenem, biapenem, meropenem, ertapenem, panipenem, razupenem, tomopenem, and cilastatin, whereas orally active carbapenems like GV-118819, GV-104326, CS-834, L-084, DZ-2640, CL 191, 121, L-646, 591, S-4661, ER-35768, MK-826. Prodrugs of carbapenem with increased bioavailability include temopenem, tebipenem, sanfetrinem, LK-157, and CP 5484. Merck, Glaxo Welcome Research Group, Johnson & Johnson, Sankyo Group and Dai-ichi Group, and Wyeth-Ayerst Group were among the businesses that produced carbapenems. In this review Witting reaction, Mitsunobu reaction, Dieckmann reaction, palladium-catalyzed hydrogenolysis, E. coli-based cloned synthesis, as well as biosynthetic enzymes such as carbapenem synthetase (carA), carboxymethylproline synthase (carB), carbapenem synthase (carC) are included. Carbapenems are biologically mainly active in the infections like urinary tract infections, bloodstream infections, tuberculosis, intra-abdominal infections, and pathogens like anaerobes, gram-positive and gram-negative bacteria.

Green Chemistry Approach for the Synthesis of Isoxazole Derivatives and Evaluation of their Anti-epileptic Activity.

BACKGROUND: Green strategy involves the design, synthesis, processing, and use of chemical substances by eliminating the generation of chemical hazards. This approach focuses on atom economy, use of safer solvents or chemicals, consumption of energy, and decomposition of the chemical substances to non-toxic materials which are eco-friendly. OBJECTIVE: So, the microwave irradiated heating method is considered a green and sustainable technique for the development of novel heterocyclic scaffold-like isoxazole derivatives via chalcones. Isoxazole derivatives play a vital role due to their diverse pharmacological activities such as antibiotic (Sulfamethoxazole, Cloxacillin, Flucloxacillin, Cycloserine), anti-fungal (Drazoxolon), Antirheumatic (Leflunomide), antidepressant (Isocarboxazid), antineoplastic (Acivicin), anticonvulsant (Zonisamide), antipsychotic (Risperidone) and anti-inflammatory drugs (Valdecoxib), etc. Methods: The isoxazole derivatives were synthesized with the help of microwave irradiation that follows green chemistry protocol. RESULTS: The titled compounds were subjected to antiepileptic evaluation to determine their therapeutic potential. CONCLUSION: The use of microwave radiation enhances the rate of the reaction which leads to high selectivity with improved product yields in comparison with the traditional heating methods. The tested compounds exhibited promising antiepileptic activity as compared to the standard drug (Phenytoin).

Microwave Induced Green Synthesis: Sustainable Technology for Efficient Development of Bioactive Pyrimidine Scaffolds.

Microwave radiation is used as a heating source during the synthesis of heterocyclic compounds. The heating mechanisms involved in microwave-induced synthesis include dipolar polarization and ionic conduction. This heating technology follows the green protocol as it involves the use of recyclable organic solvents during synthesis. The microwave heating approach offers a faster rate of reaction, easier work-up procedure, and higher product yield with purity and also reduces environmental pollution. So, microwave heating is applied as a sustainable technology for the efficient production of pyrimidine compounds as one of the heterocyclic moieties. Pyrimidine is a six-membered nitrogenous heterocyclic compound that plays a significant role due to several therapeutic applications. This moiety acts as an essential building block for generating drug candidates with diverse biological activities, including anti-cancer (capecitabine), anti-thyroid (propylthiouracil), antihistaminic (pemirolast), antimalarial (pyrimethamine), antidiabetic (alloxan), antihypertensive (minoxidil), anti-inflammatory (octotiamine), antifungal (cyprodinil), antibacterial (sulfamethazine), etc. This review is focused on the synthesis of pyrimidine analogs under microwave irradiation technique and the study of their therapeutic potentials.

Therapeutic implications of current Janus kinase inhibitors as anti-COVID agents: A review.

Severe cases of COVID-19 are characterized by hyperinflammation induced by cytokine storm, ARDS leading to multiorgan failure and death. JAK-STAT signaling has been implicated in immunopathogenesis of COVID-19 infection under different stages such as viral entry, escaping innate immunity, replication, and subsequent inflammatory processes. Prompted by this fact and prior utilization as an immunomodulatory agent for several autoimmune, allergic, and inflammatory conditions, Jakinibs have been recognized as validated small molecules targeting the rapid release of proinflammatory cytokines, primarily IL-6, and GM-CSF. Various clinical trials are under investigation to evaluate Jakinibs as potential candidates for treating COVID-19. Till date, there is only one small molecule Jakinib known as baricitinib has received FDA-approval as a standalone immunomodulatory agent in treating critical COVID-19 patients. Though various meta-analyses have confirmed and validated the safety and efficacy of Jakinibs, further studies are required to understand the elaborated pathogenesis of COVID-19, duration of Jakinib treatment, and assess the combination therapeutic strategies. In this review, we highlighted JAK-STAT signalling in the pathogenesis of COVID-19 and clinically approved Jakinibs. Moreover, this review described substantially the promising use of Jakinibs and discussed their limitations in the context of COVID-19 therapy. Hence, this review article provides a concise, yet significant insight into the therapeutic implications of Jakinibs as potential anti-COVID agents which opens up a new horizon in the treatment of COVID-19, effectively.

Novel Herbal Nanocarriers for Treatment of Dermatological Disorders.

BACKGROUND AND OBJECTIVE: In the present scenario, the use of novel nanocarriers to provide a better therapy regimen is noteworthy. Nanotechnology with the advanced system enables the herbs for encapsulation within the smart carrier and boosts the nanotherapeutic. These emerging innovations of herbal nanocarriers have paved the way for dermal targeting by eliciting the desired response for particular diseases. METHODS: In this current manuscript, an extensive search is conducted for the original research papers using databases, viz., Google Scholar, PubMed, Science Direct, etc. Furthermore, painstaking efforts are made to compile and update the novel herbal nanocarriers, such as liposomes, ethosomes, transferosomes, niosomes, nanoemulsions, nanogels, nanostructured lipid carriers, solid lipid carriers, etc., which are mostly used for the treatment of several skin maladies, viz., eczema, psoriasis, acne, etc. This article highlights the recent findings that the innovators are exclusively working on herbal drug delivery systems for dermal targeting, and these are enumerated in the form of tables. CONCLUSION: Herbal formulations employing a suitable nanocarrier could be a promising approach for the treatment of several pathological conditions, including skin ailments. Therefore, scientific research is still being carried out in this specific area for a better perspective in herbal drug delivery and targeting.

Reactive Oxygen Species (ROS): Key Components in Cancer Therapies.

Reactive Oxygen Species (ROS) refers to the highly reactive substances which contain oxygen radicals. Hypochlorous acid, peroxides, superoxide, singlet oxygen, alpha-oxygen, and hydroxyl radicals are the major examples of ROS. Generally, the reduction of oxygen (O2) in molecular form produces superoxide (•O2 -) anion. ROS are produced during a variety of biochemical reactions within the cell organelles, such as endoplasmic reticulum, mitochondria, and peroxisome. Naturally, ROS are also formed as a byproduct of the normal metabolism of oxygen. The production of ROS can be induced by various factors such as heavy metals, tobacco, smoke, drugs, xenobiotics, pollutants, and radiation. From various experimental studies, it is reported that ROS acts as either a tumor-suppressing or a tumor-promoting agent. The elevated level of ROS can arrest the growth of tumors through the persistent increase in cell cycle inhibition. The increased level of ROS can induce apoptosis by both intrinsic and extrinsic pathways. ROS is considered to be a tumor-suppressing agent as the production of ROS is due to the use of most of the chemotherapeutic agents in order to activate cell death. The cytotoxic effect of ROS provides impetus towards apoptosis, but in higher levels, ROS can cause initiation of malignancy that leads to uncontrolled cell death in cancer cells. In contrast, some species of ROS can influence various activities at the cellular level, including cell proliferation. This review highlights the genesis of ROS within cells by various routes and their role in cancer therapies.

Computational Approach to Combat COVID-19 Infection: Emerging Tools for Accelerating Drug Research.

BACKGROUND: The process of drug discovery and development is expensive, complex, timeconsuming, and risky. There are different techniques involved in the process of drug development, including random screening, computational approaches, molecular manipulation, and serendipitous research. Among these methods, the computational approach is considered an efficient strategy to accelerate and economize the drug discovery process. OBJECTIVE: This approach is mainly applied in various phases of the drug discovery process, including target identification, target validation, lead identification, and lead optimization. Due to the increase in the availability of information regarding various biological targets of different disease states, computational approaches such as molecular docking, de novo design, molecular similarity calculation, virtual screening, pharmacophore-based modeling, and pharmacophore mapping have been applied extensively. METHODS: Various drug molecules can be designed by applying computational tools to explore the drug candidates for the treatment of Coronavirus infection. The World Health Organization announced the coronavirus disease as COVID-19 and declared it a global pandemic on 11 February 2020. Therefore, it is thought of interest to the scientific community to apply computational methods to design and optimize the pharmacological properties of various clinically available and FDA-approved drugs such as remdesivir, ribavirin, favipiravir, oseltamivir, ritonavir, arbidol, chloroquine, hydroxychloroquine, carfilzomib, baraticinib, prulifloxacin, etc., for effective treatment of COVID-19 infection. RESULTS: Further, various survey reports suggest that extensive studies are carried out by various research communities to find out the safety and efficacy profile of these drug candidates. CONCLUSION: This review is focused on the study of various aspects of these drugs related to their target sites on the virus, binding interactions, physicochemical properties, etc.

Current trends in diagnosis and treatment strategies of COVID-19 infection.

Coronaviruses are terrifically precise and adapted towards specialized respiratory epithelial cells, observed in organ culture and human volunteers both. This virus is found to possess an unpredictable anti-viral T-cell response which in turn results in T-cell activation and finally apoptosis, leading to cytokine storm and collapse of the whole immune system. The present review provides comprehensive information regarding SARS-CoV-2 infection, mutant strains, and the impact of SARS-COV-2 on vital organs, the pathophysiology of the disease, diagnostic tests available, and possible treatments. It also includes all the vaccines developed so far throughout the world to control this pandemic. Until now, 18 vaccines have been approved by the WHO and further 22 vaccines are in the third trial. This study also provides up-to-date information regarding the drugs repurposed in clinical trials and the recent status of allopathic drugs along with its result. Although vaccines are available, specific treatment is not available for the disease. Furthermore, the effect of vaccines on new variants is a new area of research at this time. Therefore, a preventive attitude is the best approach to fight against this virus.

Drug Repurposing Strategy (DRS): Emerging Approach to Identify Potential Therapeutics for Treatment of Novel Coronavirus Infection.

Drug repurposing is also termed as drug repositioning or therapeutic switching. This method is applied to identify the novel therapeutic agents from the existing FDA approved clinically used drug molecules. It is considered as an efficient approach to develop drug candidates with new pharmacological activities or therapeutic properties. As the drug discovery is a costly, time-consuming, laborious, and highly risk process, the novel approach of drug repositioning is employed to increases the success rate of drug development. This strategy is more advantageous over traditional drug discovery process in terms of reducing duration of drug development, low-cost, highly efficient and minimum risk of failure. In addition to this, World health organization declared Coronavirus disease (COVID-19) as pandemic globally on February 11, 2020. Currently, there is an urgent need to develop suitable therapeutic agents for the prevention of the outbreak of COVID-19. So, various investigations were carried out to design novel drug molecules by utilizing different approaches of drug repurposing to identify drug substances for treatment of COVID-19, which can act as significant inhibitors against viral proteins. It has been reported that COVID-19 can infect human respiratory system by entering into the alveoli of lung via respiratory tract. So, the infection occurs due to specific interaction or binding of spike protein with angiotensin converting enzyme-2 (ACE-2) receptor. Hence, drug repurposing strategy is utilized to identify suitable drugs by virtual screening of drug libraries. This approach helps to determine the binding interaction of drug candidates with target protein of coronavirus by using computational tools such as molecular similarity and homology modeling etc. For predicting the drug-receptor interactions and binding affinity, molecular docking study and binding free energy calculations are also performed. The methodologies involved in drug repurposing can be categorized into three groups such as drug-oriented, target-oriented and disease or therapy-oriented depending on the information available related to quality and quantity of the physico-chemical, biological, pharmacological, toxicological and pharmacokinetic property of drug molecules. This review focuses on drug repurposing strategy applied for existing drugs including Remdesivir, Favipiravir, Ribavirin, Baraticinib, Tocilizumab, Chloroquine, Hydroxychloroquine, Prulifloxacin, Carfilzomib, Bictegravir, Nelfinavir, Tegobuvir and Glucocorticoids etc to determine their effectiveness toward the treatment of COVID-19.

Microwave-Induced Ugi-Four Component Reactions: Synthesis of New Hetero- Steroid-Amino Acid Conjugates.

BACKGROUND: Aza-steroids are an important class of compounds because of their numerous biological activities. The hetero steroids have different hydrogen bonding ability and hydrophobicity in comparison to steroids. MATERIALS AND METHODS: Microwave-induced synthesis of a novel type of hybrid hetero-steroid amine conjugates, following Ugi-four component reactions of steroidal amines with alanine and valine methyl esters as amino acid residues is described. Specifically, hetero-steroid-amino acid conjugate based on D-ring fused hetero steroidal amine, hetero-steroid-amino acid conjugate based on A-ring hetero steroidal amine, and hetero-steroidamino acid conjugate based on B-ring hetero steroidal amine are synthesized. RESULTS AND DISCUSSION: The yield of the products under microwave-induced process was considerably higher than that obtained by the conventional method. In contrast to the conventional method for the synthesis of these molecules, microwave-induced method has several advantages. CONCLUSION: These include rapid reaction, a superior yield of the product, minimum side reaction, and economical microwave-induced process.

Polyaromatic Hydrocarbons (PAHs): Structures, Synthesis and their Biological Profile.

Polycyclic aromatic hydrocarbons (PAHs) are aromatic compounds with two or more fused benzene rings in their structural configurations. PAHs do not contain heteroatoms and substituents on the ring system. PAHs containing up to four rings are called light PAHs while those that contain more than four rings are considered as heavy PAHs. Heavy PAHs are more stable and more toxic than the light PAHs. Generally, the increase in the size and angularity of a PAH molecule results in an increase in hydrophobicity and electrochemical stability. Ring linkage patterns in PAHs may occur in such a way that the tertiary carbon atoms are centers of two or three interlinked rings. The examples of PAHs are naphthalene, anthracene, phenanthrene, acenaphthylene, acenaphthene, fluorene, fluoranthene, pyrene, benz[a]anthracene, chrysene, benzo[b]fluoranthene, etc. PAHs can be produced either naturally or anthropogenically and have toxic properties. Due to the health risk posed by their exposure, there is a need to control the release of PAHs through air quality management. Refinery industries are required to monitor and regulate their discharges. There is an urgent need for the considerable efforts to be applied in the field of research to degrade and monitor potentially hazardous substances to control, predict and avoid negative effects of PAHs pollution.

An Overview on Steroids and Microwave Energy in Multi-Component Reactions towards the Synthesis of Novel Hybrid Molecules.

In recent years, hybrid systems are gaining considerable attention owing to their various biological applications in drug development. Generally, hybrid molecules are constructed from different molecular entities to generate a new functional molecule with improved biological activities. There already exist a large number of naturally occurring hybrid molecules based on both non-steroid and steroid frameworks synthesized by nature through mixed biosynthetic pathways such as, a) integration of the different biosynthetic pathways or b) Carbon- Carbon bond formation between different components derived through different biosynthetic pathways. Multicomponent reactions are a great way to generate efficient libraries of hybrid compounds with high diversity. Throughout the scientific history, the most common factors developing technologies are less energy consumption and avoiding the use of hazardous reagents. In this case, microwave energy plays a vital role in chemical transformations since it involves two very essential criteria of synthesis, minimizing energy consumption required for heating and time required for the reaction. This review summarizes the use of microwave energy in the synthesis of steroidal and non-steroidal hybrid molecules and the use of multicomponent reactions.