The incidence of cancer is increasing worldwide, affecting a vast majority of the human population, therefore, new different anticancer agents are being developed now and their safety still needs to be evaluated. Among them, pyridine based drugs are contributing a lot, as they are one of the imperative pharmacophores occurring synthetically as well as naturally in heterocyclic compounds, having a wide-range of therapeutic applications in the area of drug discovery that offers many chances for further improvement in antitumor agents via acting onto numerous receptors of extreme prominence. Many pyridine derivatives are reported to inhibit enzymes, receptors and many other targets for controlling and curing the global health issue of cancer. Nowadays in combination with other moieties, researchers are focusing on the development of pyridine-based new derivatives for cancer treatment. Therefore, this review sheds light on the recent therapeutic expansion of pyridine together with its molecular docking, structure-activity-relationship, availability in the market, a summary of recently patented and published research works that shall jointly help the scientists to produce effective drugs with the desired pharmacological activity.

A skin disease, like acne, is very common and normally happens to everyone at least once in their lifetime. The structure of the stratum corneum is often compared with a brick wall, with corneocytes surrounded by the mortar of the intercellular lipid lamellae. One of the best options for successful drug delivery to the affected area of skin is the use of ethosomes which can be transported through the skin through channel-like structures. Tretinoin is a widely used retinoid for the topical treatment of acne, photo-aged skin, psoriasis and skin cancer which makes it a good candidate for topical formulation. Yet side effects, like redness, swelling, peeling, blistering and, erythema, in addition to its high lipophilicity make this challenging. Drug loaded ethosomes had been prepared using phospholipid and ethanol, were optimized and characterized for entrapment efficiency, vesicular size, shape, In-vitro skin permeation, skin retention, drug‐membrane component interaction and stability. The ethosomal formulation having 0.5 %w/v of phospholipid and 20 %v/v of ethanol (F2) showing the greatest entrapment efficiency (80.25±0.23) with small particle size (205.40±2.31nm) was selected for further skin permeation studies. The skin permeation and skin retention studies were performed on ethosomal formulation, liposomal formulation (0.5 %w/v of phospholipid without alcohol), hydroethanolic drug solution and phosphate buffer saline (pH7.4) drug solution. Among them, ethosomal formulation showed higher cumulative percentage of drug permeation (93.36±0.45%) and 8 hours than the other formulations. Scanning electron microscopy confirmed the three dimensional nature of ethosomes. Dynamic light scattering technique proved that the ethosomes has smaller vesicular size than the liposomes prepared without alcohol. FT‐IR studies revealed no interaction between the drug and membrane components. The ethosomal vesicles were incorporated in carbopol gel base and its anti‐acne was compared with the marketed gel. Our results suggest that the ethosomes are an efficient carrier for dermal and transdermal delivery of tretinoin. Keywords: Tretinoin, Ethosomes, Diffusion, Carbopol gels, Transdermal delivery.

Computational and experimental techniques are two complimentary approaches that have important roles in drug discovery and development. Earlier time and cost of bringing a new drug in market bears a question as it takes seven to twelve years and $ 1.2 billion are often cited. Furthermore, five out of forty thousand compounds tested in animals reach human testing and only one of five compounds reaching clinical studies is approved. This accounts for a large input in terms of time, money and human and other resources. Therefore, new approaches are needed to facilitate, expedite and streamline drug discovery and development, save time, money and resources. Among many computational tools, molecular docking is one of the important means that can be used in drug discovery. It provides the information regarding the binding affinities between small molecules (ligands) and macromolecular receptor targets (proteins). Various approaches, methodology are cited in various literatures for describing the cost, time effect with success of drug discovery task. In this review, introduction of the available molecular docking methods, with simple methodology of docking and examples of drug design and discovery through computational docking methods is discussed and emphasis is made on various examples of sampling algorithms, scoring functions with their relevant characterstics with summary on type of ligand binding with receptors.

Pyridazine and its derivative are very important compounds in nitrogen containing heterocyclic compounds due to their various reported pharmacological activities such as antibacterial, muscle relaxant, anti-depressant, antidiabetic, anti-hypertensive, analgesic, anti-tumor, antiviral, nephrotropic, antiinflammatory, anti-viral, anticancer, anti-aggregative, anti-epileptic. It also serves as building block in structure of many chemical constituent of natural compounds phytopharmaceuticals such as cinnolines, phthalazines and also attracting the interest of researchers and medicinal chemist due to its privilege structure which can bear substitution/functionalization easily. Different substituted pyridazine compounds have been synthesized by researchers using different reagents and diverse synthetic route. However most of the investigations available in literature are directed to its large number of biological activities with very less discussion on its various synthetic schemes yielding different type of its derivatives. With the purpose of focusing more on this lack of recent literature this review focuses on different derivative synthesis by using different reaction schemes. Now-a-days pyridazine is serving as ligand in many known chemical reactions and scaffold for drug discovery and development. The aim of this review paper is to encourage more studies on synthesis of pyridazine derivatives which in future will play a vital role for drug discovery.

Nicotine, minodronic acid, nicotinamide (niacin), zolpidem, zolimidine, and other pyridine-based chemicals play vital roles in medicine and biology. Pyridinecontaining drugs are widely available on the market to treat a wide range of human ailments. As a result of these advances, pyridine research is continually expanding, and there are now higher expectations for how it may aid in the treatment of numerous ailments. This evaluation incorporates data acquired from sources, like PubMed, to provide a thorough summary of the approved drugs and bioactivity data for compounds containing pyridine. Most of the reactions discussed in this article will provide readers with a deeper understanding of various pyridine-related examples, which is necessary for the creation of copper catalysis-based synthetic processes that are more accessible, secure, environmentally friendly, and practical, and that also have higher accuracy and selectivity. This paper also discusses significant innovations in the multi-component copper-catalyzed synthesis of N-heterocycles (pyridine), with the aim of developing precise, cost-effective, and environmentally friendly oxygenation and oxidation synthetic methods for the future synthesis of additional novel pyridine base analogs. Therefore, the review article will serve as a novel platform for researchers investigating copperbased pyridine compounds.