The need for a mild and efficient synthesis method

The gap

Evidence profile

Sourced from the stated research gap and future work and abstract of the source papers, classified as general, drawn from work published between 2020 and 2026, spanning 5 journals. Those papers have been cited 147 times in total.

Supporting evidence — 6 representative gaps

• Silica-supported orthophosphoric acid (H3PO4·SiO2) as an environmentally friendly, heterogeneous catalyst for one-pot synthesis of 4-substituted 1,5-benzodiazepines (2026) · Chemistry of Heterocyclic Compounds · doi

  The lack of environmentally sustainable methodologies for the synthesis of biologically active molecules. The need for reusable heterogeneous catalysts for the synthesis of 4-substituted 1,5-benzodiazepines.

  generalstated research gap
  Keywords: lack environmentally sustainable methodologies synthesis biologically active molecules
• Synthetic and medicinal chemistry of phthalazines: Recent developments, opportunities and challenges (2020) · Bioorganic Chemistry · cited 52× · doi

  on phthalazine-piperizine hybrid. Nitrogen-containing heterocycles constitute a huge number of pharmaceuticals and bioactive natural products. Among them, diazaheterocycles such as phthalazines have been recognized as prominent motifs of numerous medicines and synthetic drug molecules. The development of these drug candidates is highly dependent on the sustainable synthetic methodologies and there remains a compelling need for a coordinated approach to discover novel therapeutics. This review presents a well-balanced overview of synthetic and medicinal chemistry aspects of phthalazine nucleus over the last decade. A reasonable degree of chemical complexity in the synthesis of these small molecules was achieved through various efficient and robust methods. High level of functional group tolerance was noticed in the structurally diversified phthalazine products. The use of newly developed approaches was investigated in the formation of drugs such as naproxen. Moreover, the halogenated phthalazine products were also synthetically modified using Buchwald-Hartwig amination protocol, thus enabling the formation of new carbon-nitrogen bonds. On the other hand, various biological activities of the phthalazine core have been reviewed. The careful and critical evaluation of the in vitro and in vivo bioactivity results revealed the significance of the substitution patterns. Structure-activity relationship analyses also provided insightful information leading to the generation of potent leads with enhanced inhibitory efficacy. The literature precedents (vatalanib, sunitinib, phenstatin, taladegib, vismodegib, sorafenib, Anta XV, MY 5445, PHR0007) were used to optimize and fine-tune the structures using seemingly simple exchange of bioactive pharmacophores providing a significant boost in potency. The possible binding modes of the most potent leads were visualized using molecular docking approach. Despite these remarkable achievements, there is still lack of an integrated strategy to overcome the challenges and deficit of potent leads in drug discovery arena. The green and sustainable syntheses need to be developed while applying the low-cost procedures and shortening the reaction steps. The careful selection of lead compounds considering their physical properties, pharmacological profiling, and 92 appropriate structure–activity relationships need to be developed. In vitro toxicity screening as well as in vivo testing need improvement at the earlier phase of drug discovery process, thus allowing medicinal chemists to safely design the drug candidate. Collectively, the developed synthetic methodologies and bioactive potential associated with the phthalazine nucleus will serve as a handy guide to design new strategies tightly linked to the discovery and development of effective therapeutic drugs.

  generalfuture workevidence 5/5
  Keywords: phthalazine drug synthetic need developed bioactive products using potent leads discovery nitrogen molecules development sustainable
• Recent advances in synthesis and medicinal chemistry of benzodiazepines (2020) · Bioorganic Chemistry · cited 95× · doi

  Benzodiazepines represent a so-called privileged scaffold in modern medicinal chemistry possessing a wide spectrum of biological activities and tremendous applications in various fields. Their potentiality has led the interest of organic and medicinal chemists to design a library of pharmacologically active compounds. In the last decade, significant progress has been made in the synthetic chemistry of these agents and a large number of novel benzodiazepine derivatives have been successfully synthesized and screened as potential treatments for a multitude of medical conditions or as molecules demonstrating a response towards diverse biological targets. The enormous amount of data relating to the structure-activity relationship for benzodiazepines derived from structurally diverse substrates has added to previous knowledge, thus allowing better insight into the design of more effective drug candidates. The present review provides a detailed account of the current status of benzodiazepines including modern advancements in their synthetic methodologies, medicinal chemistry and structure-activity relationship studies along with the insight of their interaction with key biological targets. The different classes of benzodiazepines or fused benzodiazepines ring systems proved their significance in drug design. They have been either synthetically prepared via different approaches or can be isolated from natural resources but synthetic approaches involving reactions of an array of diamines with the library of different carbonyl substrates predominated for the synthesis of novel functionalized benzodiazepine molecules. A number of reports stating the advancement in synthetic process for the preparation of functionalized benzodiazepines have been described by various researchers throughout the world. The synthetic protocols discussed in this review are high-yielding, highly efficient and some selective catalytic processes operating under mild conditions were also included. We have described the use of transition metal catalysis (such as Rh(III), and palladium), acid catalysis using different Lewis acids, microwave-assisted green synthesis, applications of MOFs, C-H functionalization, cycloaddition and transition metal-free oxidative cyclization to achieve the efficient synthesis of various benzodiazepines under mild conditions with desired stereo/regioselectivity. Biological profile of benzodiazepine based motifs with appropriate substitution pattern has been attributed due to their ability to interact with various key biological targets or biomolecules involved in various biochemical pathways, which extend their spectrum of activity and makes them attractive lead molecules for the design and development of heterocyclic compounds in the field of drug discovery. For example interaction of benzodiazepine based motifs with biological targets such as BET (Bromodomain Inhibitors) and X-linked inhibitors of the apoptosis protein (XIAP) contributed towards the anticancer activity. They were also reported as sodium channel inhibitors, 1 γ-secretase inhibitor, 2 interleukin-1β-converting enzymes (ICE) inhibitors, 4 cholecystokinins (CCK)-2 antagonists and non-nucleoside inhibitors of HIV-1 reverse transcriptase. This potential biological profile makes them a powerful tool for the design and development of novel therapeutic candidates. The above discussion and observations demonstrated that there is much scope in this promising moiety. Possible future efforts involve the development of even more efficient catalytic systems to extend the substrate scope of benzodiazepines by utilizing a wide range of catalytic reagents. Also, extensive biological profile and pharmaceutical properties displayed by benzodiazepine- based motifs along with structure-activity relationship properties will undeniably lead to potential pharmaceutical agents with the relevant pharmacological profile. In particular, there is much scope in the design and development of pyrrolobenzodiazepines as DNA minor groove sequence-specific agents for the treatment of cancer. We hope that this literature will inspire more exciting research in various disciplinary fields and provides useful information regarding how the benzodiazepines nucleus can be utilized by a medicinal chemist for the design as well as the development of clinically viable molecules for the treatment of various devastating diseases.

  generalfuture workevidence 5/5
  Keywords: benzodiazepines biological various design synthetic benzodiazepine activity development inhibitors medicinal molecules targets different profile chemistry
• A Mild and Efficient Oxalic Acid Catalysed Synthesis of 1,5-Benzodiazepines via Cyclocondensation of β-Amino Ketones with o-Phenylenediamine (2026) · Asian Journal of Chemistry · doi

  The need for a mild and efficient synthesis method for 1,5-benzodiazepines. The limitations of traditional synthesis methods, including harsh reaction conditions and expensive catalysts.

  generalstated research gapevidence 5/5
  Keywords: need mild efficient synthesis method benzodiazepines limitations traditional
• Synthesis, characterization, and antibacterial activity of Benzimidazole Schiff Bases and Bis(thiazolidin-4-one) Derivatives (2026) · World Journal of Chemical and Pharmaceutical Sciences · doi

  The study aims to address the gap in the synthesis and evaluation of benzimidazole-linked compounds. The introduction highlights the importance of benzimidazole-containing hybrids in pharmacophore design, which is not fully explored.

  generalstated research gapevidence 5/5
  Keywords: study aims address gap synthesis evaluation benzimidazole-linked compounds
• Nickel-Catalyzed Ligand-Controlled Selective Reductive Cyclization/Cross-Couplings (2023) · Accounts of Chemical Research · doi

  Further investigation of ligand properties has led to tunable cyclization/cross-couplings (addition to the amide carbonyl vs 7- endo -cyclization) for the divergent synthesis of pharmacologically important 2-benzazepine frameworks.

  generalabstractevidence 4/5
  Keywords: cyclization further investigation ligand properties tunable cross couplings addition amide carbonyl endo divergent synthesis pharmacologically

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