Heterocyclic compounds are that type of substances that are deeply intertwined with biological processes. Heterocycles are found in about 90% of commercially available medicines. In medicinal chemistry, finding new synthetic molecules with drug-like characteristics is a regular problem, which triggered the development of pharmacological molecules, the majority of which are based on N-heterocyclic motifs. Among the heterocycles, the pyrrole scaffold is the most commonly found heterocycle in both natural and synthetic bioactive compounds. Pyrrole has a fivemembered heterocyclic ring with a plethora of pharmacophores, resulting in a library of different lead compounds. Pyrrole derivatives are physiologically active heterocyclic compounds that can be used as scaffolds for antibacterial, antiviral, anticancer, antitubercular, anti-inflammatory, and as enzyme inhibitors. On account of their extensive pharmacological profile, pyrrole and its various synthetic derivatives have drawn much attention from researchers to explore it for the benefit of humankind. This review presents an overview of recent developments in the pyrrole derivatives against multiple therapeutic targets.

Alzheimer's disease (AD) is a chronic neurodegenerative brain disorder characterized by memory impairment, dementia, and oxidative stress in elderly people. Currently, only a few drugs are available in the market with various adverse effects. Therefore, to develop new drugs with protective action against the disease, research is turning to the identification of plant products as a remedy. Natural compounds with anti-inflammatory activity could be good candidates for developing effective therapeutic strategies. Phytochemicals, including Curcumin, Resveratrol, Quercetin, Huperzine-A, Rosmarinic acid, genistein, obovatol, and Oxyresvertarol, were reported molecules for the treatment of AD. Several alkaloids, such as galantamine, oridonin, glaucocalyxin B, tetrandrine, berberine and anatabine, have been shown anti-inflammatory effects in AD models in vitro as well as in-vivo. In conclusion, natural products from plants represent interesting candidates for the treatment of AD. This review highlights the potential of specific compounds from natural products along with their synthetic derivatives to counteract AD in the CNS.

Background: Berberine (BBR), an alkaloidal compound found in many plants, is widely used for hundreds of years in the traditional system of Chinese medicine. Objective/Aim: The present review is aimed to summarize the potential of Berberine in the amelioration of various neurological disorders. Methods: The collection of data for the compilation of this review work was searched in PubMed Scopus, Google Scholar, and Science Direct. Of late, researchers are more focused on its beneficial role in neurodegenerative diseases. Result: BBR has proven its protective role in numerous neurotoxicity models including, oxygen-glucose deprivation, mercury-induced, neurodegenerative model by ibotenic acid, and hypoxia caused by COCl2. BBR treatment averts the generation of reactive oxygen species in the oxygen-glucose deprivation model. Further, it subdues cytochrome c along with the divulge of apoptosis-inducing factors that indicate its beneficial action in the management of stroke. BBR diminished hydrogen peroxide-induced neuronal damage by enhancing the PI3k / Akt / Nrf-2 based pathway and showed a preventive impact on neurites of SH-SY5Y cells by averting the formation of ROS and inhibiting apoptosis. The impact of BBR on neurological disorder using a transgenic AD type mouse strain (TgCRND8) showed a reduction in the piling up of amyloid-β plaque. In mice, administration of BBR in the dose range of 5-10m/kg has been reported to raise the levels of serotonin (47%), dopamine (31%), and norepinephrine (29%) in CNS to allay depression. Conclusion: The present review is aimed to summarize the potential of Berberine in the amelioration of various neurological disorders.

Background: Curcumin, a hydrophobic polyphenolic compound present in Curcuma longa Linn. (Turmeric), has been used to improve various neurodegenerative conditions, including Amyotrophic lateral sclerosis, multiple sclerosis, Parkinson's disease, Prion disease, stroke, anxiety, depression, and ageing. However, the Blood-Brain Barrier (BBB) impedes the delivery of curcumin to the brain, limiting its therapeutic potential. Objective/Aim: This review summarises the recent advances towards the therapeutic efficacy of curcumin along with various novel strategies to overcome its poor bioavailability across the bloodbrain barrier. Methods: The data for the compilation of this review work were searched in PubMed Scopus, Google Scholar, and Science Direct. Result: The review also summarises the numerous toxicological studies and the role of curcumin in CNS disorders. Conclusion: The review also summarises the numerous toxicological studies and the role of curcumin in CNS disorders.

Cancer is one of the most alarming diseases, with an estimation of 9.6 million deaths in 2018. Glioma occurs in glial cells surrounding nerve cells. The majority of the patients with gliomas have a terminal prognosis, and the ailment has significant sway on patients and their families, be it physical, psychological, or economic wellbeing. As Glioma exhibits, both intra and inter tumour heterogeneity with multidrug resistance and current therapies are ineffective. So the development of safer anti gliomas agents is the need of hour. Bioactive heterocyclic compounds, eithernatural or synthetic,are of potential interest since they have been active against different targets with a wide range of biological activities, including anticancer activities. In addition, they can cross the biological barriers and thus interfere with various signalling pathways to induce cancer cell death. All these advantages make bioactive natural compounds prospective candidates in the management of glioma. In this review, we assessed various bioactive heterocyclic compounds, such as jaceosidin, hispudlin, luteolin, silibinin, cannabidiol, tetrahydrocannabinol, didemnin B, thymoquinone, paclitaxel, doxorubicin, and cucurbitacins for their potential anti-glioma activity. Also, different kinds of chemical reactions to obtain various heterocyclic derivatives, e.g. indole, indazole, benzimidazole, benzoquinone, quinoline, quinazoline, pyrimidine, and triazine, are listed.

Background: Amyotrophic lateral sclerosis (ALS) is a motor neuron disease (MND) that typically causes death within 3-5 years after diagnosis. Regardless of the substantial scientific knowledge accrued from more than a century ago, truly effective therapeutic strategies remain distant. Various conventional drugs are being used but are having several adverse effects.Objective/Aim: The current study aims to thoroughly review plant-derived compounds with well-defined ALS activities and their structure-activity relationships. Moreover, the review also focuses on complex genetics, clinical trials, and the use of natural products that might decrypt the future and novel therapeutics in ALS.Methods: The collection of data for the compilation of this review work was searched in PubMed Scopus, Google Scholar, and Science Direct.Results: Results showed that phytochemicals like-Ginkgolides, Protopanaxatriol, Genistein, epigallocatechingallate, resveratrol, cassoside, and others possess Amyotrophic lateral sclerosis (ALS) activity by various mechanisms.Conclusion: These plant-derived compounds may be considered as supplements to conventional (ALS). Moreover, further preclinical and clinical studies are required to understand the structure-activity relationships, metabolism, absorption, and mechanisms of plant-derived natural agents.