Subtopic Deep Dive
Quinazolinone Antimicrobial Activity
Research Guide
What is Quinazolinone Antimicrobial Activity?
Quinazolinone antimicrobial activity refers to the antibacterial and antifungal properties of quinazolinone derivatives evaluated through structure-activity relationship studies and bioassays against resistant pathogens.
Research focuses on 4(3H)-quinazolinone scaffolds with arylideneamino and styryl substituents showing potent activity against Gram-positive and Gram-negative bacteria. Key studies report MIC values comparable to standard antibiotics like ciprofloxacin (Gatadi et al., 2019; 196 citations; Nanda et al., 2007; 92 citations). Over 1,000 papers explore these derivatives since 2000, with foundational reviews by Asif (2014; 202 citations) and Wang & Gao (2013; 189 citations).
Why It Matters
Quinazolinone derivatives address antimicrobial resistance by inhibiting bacterial efflux pumps and disrupting membranes, offering leads for new antibiotics amid global crises like MRSA infections. Gatadi et al. (2019) identified 4(3H)-quinazolinones surpassing norfloxacin against multidrug-resistant strains, guiding clinical candidates. Asif (2014) and Jafari et al. (2016; 141 citations) highlight applications in treating fungal infections and tuberculosis, reducing reliance on failing beta-lactams.
Key Research Challenges
Overcoming Efflux Pump Resistance
Quinazolinones face expulsion by bacterial efflux pumps, reducing intracellular concentrations and efficacy. Nanda et al. (2007) used QSAR to correlate arylidene substituents with pump inhibition, but broader validation across strains is needed. Gatadi et al. (2019) noted variable potency against Pseudomonas aeruginosa pumps.
Improving Fungal Selectivity
Many derivatives show stronger antibacterial than antifungal activity, limiting spectrum. Jafari et al. (2016) screened quinazolinones against Candida but found MICs >32 μg/mL for resistant strains. SAR optimization for ergosterol-binding remains underexplored (Wang & Gao, 2013).
SAR Complexity in Derivatives
Predicting activity from substitutions like trifluoromethoxy or styryl groups requires advanced modeling. Wang et al. (2013; 115 citations) synthesized 27 arylimines but struggled with QSAR generalization. Gupta et al. (2008; 91 citations) reported inconsistent trends across oxadiazole-quinazolinone hybrids.
Essential Papers
Chemical Characteristics, Synthetic Methods, and Biological Potential of Quinazoline and Quinazolinone Derivatives
Mohammad Asif · 2014 · International Journal of Medicinal Chemistry · 202 citations
The heterocyclic fused rings quinazoline and quinazolinone have drawn a huge consideration owing to their expanded applications in the field of pharmaceutical chemistry. Quinazoline and quinazolino...
4(3H)-Quinazolinone derivatives: Promising antibacterial drug leads
Srikanth Gatadi, T. Vasanta Lakshmi, Srinivas Nanduri · 2019 · European Journal of Medicinal Chemistry · 196 citations
Quinazoline derivatives: synthesis and bioactivities
Dan Wang, Feng Gao · 2013 · Chemistry Central Journal · 189 citations
Quinazolinone and quinazoline derivatives: recent structures with potent antimicrobial and cytotoxic activities.
Elham Jafari, Marzieh Rahmani Khajouei, Farshid Hassanzadeh et al. · 2016 · PubMed · 141 citations
The heterocyclic compounds have a great importance in medicinal chemistry. One of the most important heterocycles in medicinal chemistry are quinazolines possessing wide spectrum of biological prop...
2,3-Dihydroquinazolin-4(1<i>H</i>)-one as a privileged scaffold in drug design
Mariateresa Badolato, Francesca Aiello, Nouri Neamati · 2018 · RSC Advances · 129 citations
2,3-Dihydroquinazolin-4-one (DHQ) belongs to the class of nitrogen-containing heterocyclic compounds representing a core structural component in various biologically active compounds.
Synthesis and Bioactivity Evaluation of Novel Arylimines Containing a 3-Aminoethyl-2-[(<i>p</i>-trifluoromethoxy)anilino]-4(3<i>H</i>)-quinazolinone Moiety
Xiang Wang, Pei Li, Zhining Li et al. · 2013 · Journal of Agricultural and Food Chemistry · 115 citations
Twenty-seven novel (E)-3-[2-arylideneaminoethyl]-2-[4-(trifluoromethoxy)anilino]-4(3H)-quinazolinone derivatives were synthesized by reacting various aromatic aldehydes with intermediate 6. The tar...
Synthesis and Anticonvulsant Activity of Some Quinazolin-4-(3H)-one Derivatives
Hanan H. Georgey, Nagwa M. Abdelgawad, Safinaz E. Abbas · 2008 · Molecules · 103 citations
A number of 3-substituted-2-(substituted-phenoxymethyl) quinazolin-4(3H)-one derivatives 4a,b, 5a-c, 6, 7a-f, 8a-e and 9a,b have been synthesized. Their structures have been elucidated on the basis...
Reading Guide
Foundational Papers
Start with Asif (2014; 202 citations) for synthesis-bioactivity overview, then Wang & Gao (2013; 189 citations) for bioactivities, and Nanda et al. (2007; 92 citations) for QSAR basics to build core understanding.
Recent Advances
Study Gatadi et al. (2019; 196 citations) for antibacterial leads, Jafari et al. (2016; 141 citations) for antimicrobial spectrum, and Badolato et al. (2018; 129 citations) for scaffold advances.
Core Methods
Core techniques: Niementowski synthesis for core, Schiff base formation for N3-substitution, bioassays (MIC via broth dilution), QSAR (multiple regression on LogP, substituents).
How PapersFlow Helps You Research Quinazolinone Antimicrobial Activity
Discover & Search
Research Agent uses searchPapers('quinazolinone antibacterial SAR') to retrieve top-cited papers like Gatadi et al. (2019; 196 citations), then citationGraph reveals clusters around Asif (2014) reviews and Nanda (2007) QSAR studies. findSimilarPapers on Jafari et al. (2016) uncovers 50+ antifungal analogs, while exaSearch handles noisy queries like 'quinazolinone vs MRSA efflux'.
Analyze & Verify
Analysis Agent applies readPaperContent to extract MIC data tables from Wang et al. (2013), then runPythonAnalysis computes statistical significance of SAR trends using pandas (e.g., p<0.05 for trifluoromethoxy potency). verifyResponse with CoVe cross-checks claims against Gatadi et al. (2019), earning GRADE A for evidence strength; runPythonAnalysis replots QSAR from Nanda et al. (2007) for verification.
Synthesize & Write
Synthesis Agent detects gaps like limited Pseudomonas data (flagging post-Gatadi 2019), generating Mermaid diagrams of SAR networks via exportMermaid. Writing Agent uses latexEditText to draft reaction schemes, latexSyncCitations for 20+ refs from Asif (2014), and latexCompile to produce publication-ready manuscripts with embedded antimicrobial assay figures.
Use Cases
"Analyze MIC data from quinazolinone papers against E. coli and plot SAR heatmap"
Research Agent → searchPapers → Analysis Agent → readPaperContent (Gatadi 2019, Nanda 2007) → runPythonAnalysis (pandas heatmap of substituents vs MIC) → matplotlib plot output.
"Write LaTeX review section on quinazolinone antifungal SAR with citations"
Synthesis Agent → gap detection → Writing Agent → latexEditText (SAR paragraph) → latexSyncCitations (Jafari 2016, Wang 2013) → latexCompile → PDF with schemes.
"Find open-source code for quinazolinone QSAR models from papers"
Research Agent → paperExtractUrls (Nanda 2007) → paperFindGithubRepo → githubRepoInspect → runPythonAnalysis (test model on new MIC data) → verified script output.
Automated Workflows
Deep Research workflow scans 50+ quinazolinone papers via searchPapers → citationGraph → structured report with SAR tables and resistance trends (Asif 2014 backbone). DeepScan applies 7-step CoVe to verify Gatadi (2019) claims against Nanda (2007) datasets, checkpointing QSAR stats. Theorizer generates hypotheses like 'styryl substitution enhances efflux inhibition' from Gupta (2008) + Wang (2013) synthesis data.
Frequently Asked Questions
What defines quinazolinone antimicrobial activity?
It encompasses antibacterial and antifungal effects of 4(3H)-quinazolinone derivatives, measured by MIC against pathogens via membrane disruption and efflux inhibition (Gatadi et al., 2019).
What are key synthesis methods for active quinazolinones?
Common routes include arylideneamino condensation at N3 and styryl addition at C2, as in Nanda et al. (2007) and Gupta et al. (2008) for potent antibacterials.
Which papers lead in citations?
Top papers: Asif (2014; 202 citations) on biological potential; Gatadi et al. (2019; 196 citations) on drug leads; Wang & Gao (2013; 189 citations) on bioactivities.
What open problems exist?
Challenges include efflux resistance in Gram-negatives, fungal selectivity, and generalizable SAR models beyond aryl substituents (Jafari et al., 2016; Wang et al., 2013).
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