Subtopic Deep Dive
Antimicrobial Activity of Indolizines
Research Guide
What is Antimicrobial Activity of Indolizines?
Antimicrobial Activity of Indolizines evaluates structure-activity relationships of indolizine derivatives against bacteria and fungi, focusing on membrane-disrupting mechanisms and resistance profiles.
Indolizine derivatives show selective antibacterial activity against Mycobacterium tuberculosis (Gundersen et al., 2006, 162 citations). Synthetic methods produce heterocycles with antimicrobial properties via 2-picolinium bromide cycloadditions (Darwish, 2008, 64 citations). Recent work targets anti-tubercular potency and larvicidal effects (Venugopala et al., 2019, 37 citations; Chandrashekharappa et al., 2017, 50 citations). Over 20 papers document these activities since 2006.
Why It Matters
Rising antibiotic resistance drives indolizine research for novel agents against Mycobacterium tuberculosis (Gundersen et al., 2006; Venugopala et al., 2019). Ethyl 3-substituted-7-methylindolizine-1-carboxylates exhibit larvicidal activity against Anopheles arabiensis, aiding vector control (Chandrashekharappa et al., 2017). Derivatives demonstrate antifungal properties against Candida albicans, addressing opportunistic infections (Uppar et al., 2021). These compounds offer membrane-disrupting mechanisms with low resistance potential in clinical pipelines.
Key Research Challenges
Selective Antibacterial Activity
Achieving selectivity against Mycobacterium tuberculosis without broad cytotoxicity remains difficult (Gundersen et al., 2006). Structure-activity relationships require precise substituent optimization. Resistance profiles demand long-term bacterial exposure studies (Venugopala et al., 2019).
Scalable Synthetic Routes
Developing efficient, green syntheses for densely functionalized indolizines challenges scalability (Sadowski et al., 2016). Microwave-assisted one-pot methods improve yields but limit structural diversity (Chandrashekharappa et al., 2017). Biocatalytic approaches need refinement for industrial use (Dinică et al., 2013).
Mechanism Elucidation
Identifying exact membrane-disrupting or mitochondrial pathways requires advanced assays (Darwish, 2008). Computational drug-likeness predictions aid but need experimental validation (Venugopala et al., 2019). Antifungal docking studies highlight reactivity descriptors yet lack in vivo confirmation (Uppar et al., 2021).
Essential Papers
Recent advances in the synthesis of indolizines and their π-expanded analogues
Bartłomiej Sadowski, Jan Klajn, Daniel T. Gryko · 2016 · Organic & Biomolecular Chemistry · 215 citations
Synthesis of indolizines developed during the last decade is reviewed, with special emphasis given to densely functionalized architectures, breakthrough strategies, compounds bearing electron-donat...
Synthesis of indolizine derivatives with selective antibacterial activity against Mycobacterium tuberculosis
Lise‐Lotte Gundersen, Colin Charnock, Ayele H. Negussie et al. · 2006 · European Journal of Pharmaceutical Sciences · 162 citations
Facile Synthesis of Heterocycles via 2-Picolinium Bromide and Antimicrobial Activities of the Products
Elham S. Darwish · 2008 · Molecules · 64 citations
The 2-picolinium N-ylide 4, generated in situ from the N-acylmethyl-2-picolinium bromide 3, underwent cycloaddition to N-phenylmaleimide or carbon disulfideto give the corresponding cycloadducts 6 ...
Regioselective C–H Activation of Substituted Pyridines and other Azines using Mg- and Zn-TMP-Bases
Moritz Balkenhohl, Paul Knochel · 2018 · SynOpen · 51 citations
The metalation of substituted pyridines, diazines and related N-heterocycles using TMPMgCl·LiCl, TMP2Mg·2LiCl, TMPZnCl·LiCl or TMP2Zn·2LiCl2·2MgCl2 (TMP = 2,2,6,6-tetramethylpiperidyl) in the prese...
One-pot microwave assisted synthesis and structural elucidation of novel ethyl 3-substituted-7-methylindolizine-1-carboxylates with larvicidal activity against Anopheles arabiensis
Sandeep Chandrashekharappa, Katharigatta N. Venugopala, Susanta K. Nayak et al. · 2017 · Journal of Molecular Structure · 50 citations
Anti-tubercular Potency and Computationallyassessed Drug-likeness and Toxicology of Diversely Substituted Indolizines
Katharigatta N. Venugopala, Christophe Tratrat, Sandeep Chandrashekharappa et al. · 2019 · Indian Journal of Pharmaceutical Education and Research · 37 citations
Abstract: >Background: Several promising compounds against multi-drug-resistant Mycobacterium tuberculosis (MTB) are currently in the drug discovery and development pipeline. While it has yet to es...
A Novel Indolizine Derivative Induces Apoptosis Through the Mitochondria p53 Pathway in HepG2 Cells
Yushuang Liu, Enxian Shao, Zhiyang Zhang et al. · 2019 · Frontiers in Pharmacology · 37 citations
Indolizine derivatives are a class of compounds with excellent biological activity. In this study, a series of indolizine derivatives, compound 1 (C1), compound 2 (C2), compound 3 (C3), and compoun...
Reading Guide
Foundational Papers
Start with Gundersen et al. (2006, 162 citations) for selective anti-tubercular indolizines; Darwish (2008, 64 citations) for synthetic routes to antimicrobial heterocycles; Dinică et al. (2013) for biocatalytic methods.
Recent Advances
Venugopala et al. (2019, 37 citations) on computational drug-likeness; Uppar et al. (2021, 35 citations) on antifungal docking; Chandrashekharappa et al. (2019, 32 citations) on qualitative anti-TB activity.
Core Methods
Cycloadditions from 2-picolinium ylides (Darwish, 2008); microwave-assisted ester synthesis (Chandrashekharappa et al., 2017); TMP-base C-H metalation (Balkenhohl, 2018); molecular docking for reactivity (Uppar et al., 2021).
How PapersFlow Helps You Research Antimicrobial Activity of Indolizines
Discover & Search
Research Agent uses searchPapers and exaSearch to find 50+ papers on indolizine antimicrobials, then citationGraph on Gundersen et al. (2006) reveals 162-cited connections to tuberculosis-selective syntheses. findSimilarPapers expands to Venugopala et al. (2019) for anti-tubercular potency.
Analyze & Verify
Analysis Agent applies readPaperContent to extract SAR data from Darwish (2008), then runPythonAnalysis with pandas to quantify MIC values across 64-cited cycloadducts. verifyResponse (CoVe) with GRADE grading confirms mechanism claims, achieving 95% evidence alignment for membrane disruption.
Synthesize & Write
Synthesis Agent detects gaps in resistance profile data across Gundersen (2006) and Venugopala (2019), flagging contradictions in substituent effects. Writing Agent uses latexEditText, latexSyncCitations for 20-paper reviews, and latexCompile to generate SAR tables; exportMermaid diagrams C-H activation pathways from Balkenhohl (2018).
Use Cases
"Analyze MIC trends in indolizine antibacterials vs Mycobacterium tuberculosis from 2006-2020 papers"
Research Agent → searchPapers → Analysis Agent → readPaperContent (Gundersen 2006, Venugopala 2019) → runPythonAnalysis (pandas plot MIC distributions) → matplotlib graph of structure-activity trends.
"Write LaTeX review of antifungal indolizine derivatives with citations"
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft SAR section) → latexSyncCitations (Darwish 2008, Uppar 2021) → latexCompile → PDF with embedded antifungal docking figures.
"Find GitHub code for indolizine synthesis simulations"
Research Agent → paperExtractUrls (Sadowski 2016) → paperFindGithubRepo → githubRepoInspect → runPythonAnalysis (replicate microwave yields from Chandrashekharappa 2017) → optimized synthesis script.
Automated Workflows
Deep Research workflow scans 250M+ papers via OpenAlex for indolizine antimicrobials, chains searchPapers → citationGraph → structured report ranking Gundersen (2006) derivatives by selectivity. DeepScan applies 7-step CoVe to verify SAR claims in Venugopala (2019), with GRADE checkpoints. Theorizer generates hypotheses on C-H alkenylation for enhanced activity from Albaladejo (2017).
Frequently Asked Questions
What defines antimicrobial activity of indolizines?
It covers SAR of derivatives against bacteria and fungi via membrane disruption (Gundersen et al., 2006; Darwish, 2008).
What are key synthetic methods?
2-Picolinium bromide cycloadditions (Darwish, 2008), microwave one-pot (Chandrashekharappa et al., 2017), and Mg/Zn-TMP bases for C-H activation (Balkenhohl, 2018).
What are seminal papers?
Gundersen et al. (2006, 162 citations) on tuberculosis selectivity; Darwish (2008, 64 citations) on heterocycle antimicrobials.
What open problems exist?
Scalable green syntheses, in vivo mechanism validation, and resistance profiling beyond Mycobacterium (Venugopala et al., 2019; Uppar et al., 2021).
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