Subtopic Deep Dive
Fluorinated Heterocyclic Compounds
Research Guide
What is Fluorinated Heterocyclic Compounds?
Fluorinated heterocyclic compounds are organic molecules containing fluorine atoms integrated into heterocyclic rings such as oxadiazoles and thiadiazoles, analyzed for structural properties and enhanced metabolic stability using techniques like 19F NMR and X-ray crystallography.
This subtopic focuses on synthesis methods like ring-enlargement reactions of 1,2,4-oxadiazoles with hydrazine (Buscemi et al., 2005, 75 citations) and ANRORC-like rearrangements (Palumbo Piccionello et al., 2006, 45 citations). Structural analysis employs 19F NMR for hydrogen bonding (Mishra and Suryaprakash, 2017, 70 citations) and X-ray diffraction for crystal structures. Over 10 key papers from 2001-2022 document ~700 cumulative citations.
Why It Matters
Fluorination in oxadiazoles and thiadiazoles boosts metabolic stability and bioavailability, making them clinical candidates in microbiology (Upare and Roopan, 2022, 122 citations). Photochemical routes enable synthesis of fluorinated heterocycles for drug development (Buscemi et al., 2003, 38 citations). Crystal engineering of fluorinated stilbenes reveals intermolecular interactions critical for co-crystal design (Mariaca et al., 2006, 38 citations). These properties position compounds for pharmaceutical applications.
Key Research Challenges
Competitive Reaction Pathways
Ring-enlargement of 1,2,4-oxadiazoles with hydrazine yields competitive paths, complicating selective synthesis of fluorinated Z-oximes (Buscemi et al., 2005). Control over nucleophilic addition at C(5) remains difficult. Optimization requires detailed mechanistic studies.
Detecting Intramolecular H-Bonding
Organic fluorine's weak hydrogen bonding in heterocycles demands combined 1D/2D 19F NMR and DFT calculations for detection (Mishra and Suryaprakash, 2017). Spectral overlap hinders precise structural elucidation. Validation across derivatives is resource-intensive.
Crystal Structure Prediction
Fluorinated heterocycles exhibit complex intermolecular forces, challenging co-crystal formation predictions (Mariaca et al., 2006). Electrostatic potentials from X-ray data guide engineering but lack generality. Scaling to polyfluorinated systems persists as an issue.
Essential Papers
Biological activity of oxadiazole and thiadiazole derivatives
Upare Abhay Atmaram, Selvaraj Mohana Roopan · 2022 · Applied Microbiology and Biotechnology · 122 citations
Fluorinated Heterocyclic Compounds. An Effective Strategy for the Synthesis of Fluorinated<i>Z</i>-Oximes of 3-Perfluoroalkyl-6-phenyl-2<i>H</i>-1,2,4-triazin- 5-ones via a Ring-Enlargement Reaction of 3-Benzoyl-5-perfluoroalkyl-1,2,4-oxadiazoles and Hydrazine
Silvestre Buscemi, Andrea Pace, Antonio Palumbo Piccionello et al. · 2005 · The Journal of Organic Chemistry · 75 citations
The reaction of 3-benzoyl-5-perfluoroalkyl-1,2,4-oxadiazoles with hydrazine has been investigated, evidencing the possibility of competitive reaction paths. Nucleophilic addition of the hydrazine t...
Recent Advances in the Chemistry of 1,2,4-OxadiazolesaaDedicated to Professor Nicolò Vivona on the occasion of his 75th birthday.
Andrea Pace, Silvestre Buscemi, Antonio Palumbo Piccionello et al. · 2015 · Advances in heterocyclic chemistry · 70 citations
Intramolecular Hydrogen Bonding Involving Organic Fluorine: NMR Investigations Corroborated by DFT-Based Theoretical Calculations
Sandeep Kumar Mishra, N. Suryaprakash · 2017 · Molecules · 70 citations
The combined utility of many one and two dimensional NMR methodologies and DFT-based theoretical calculations have been exploited to detect the intramolecular hydrogen bond (HB) in number of differ...
Molecular docking, dynamics simulation and ADMET prediction of Acetaminophen and its modified derivatives based on quantum calculations
Monir Uzzaman, Jakaria Shawon, Zainul Abedin Siddique · 2019 · SN Applied Sciences · 45 citations
The Fascinating Chemistry of α‐Haloamides
Anna Fantinati, Vinicio Zanirato, Paolo Marchetti et al. · 2020 · ChemistryOpen · 45 citations
Abstract The aim of this review is to highlight the rich chemistry of α‐haloamides originally mainly used to discover new C−N, C−O and C−S bond forming reactions, and later widely employed in C−C c...
Synthesis of fluorinated indazoles through ANRORC-like rearrangement of 1,2,4-oxadiazoles with hydrazine
Antonio Palumbo Piccionello, Andrea Pace, Ivana Pibiri et al. · 2006 · Tetrahedron · 45 citations
Reading Guide
Foundational Papers
Start with Buscemi et al. (2005, 75 citations) for ring-enlargement mechanisms; Palumbo Piccionello et al. (2006, 45 citations) for ANRORC indazoles; Buscemi et al. (2003, 38 citations) for photochemistry basics.
Recent Advances
Upare and Roopan (2022, 122 citations) for biological applications; Mishra and Suryaprakash (2017, 70 citations) for NMR/DFT advances; Pace et al. (2015, 70 citations) for oxadiazole chemistry review.
Core Methods
19F NMR with DFT for H-bonding (Mishra and Suryaprakash, 2017); X-ray crystallography for structures (Altaf et al., 2015); Horner-Wadsworth-Emmons for stilbenes (Mariaca et al., 2006).
How PapersFlow Helps You Research Fluorinated Heterocyclic Compounds
Discover & Search
Research Agent uses searchPapers and citationGraph to map 75-cited Buscemi et al. (2005) ring-enlargement work, revealing clusters around oxadiazole synthesis; exaSearch uncovers photochemical routes (Buscemi et al., 2003); findSimilarPapers expands to thiadiazole biology (Upare and Roopan, 2022).
Analyze & Verify
Analysis Agent applies readPaperContent to extract 19F NMR data from Mishra and Suryaprakash (2017), verifies H-bond claims via verifyResponse (CoVe) with GRADE scoring on DFT evidence, and runs PythonAnalysis for spectral peak deconvolution using NumPy/pandas on extracted datasets.
Synthesize & Write
Synthesis Agent detects gaps in scalable fluorination methods post-2022, flags contradictions in reaction paths across Buscemi/Pace papers; Writing Agent uses latexEditText, latexSyncCitations for oxadiazole review drafts, latexCompile for publication-ready PDFs, and exportMermaid for reaction pathway diagrams.
Use Cases
"Analyze 19F NMR shifts for H-bonding in fluorinated oxadiazoles from Mishra 2017."
Research Agent → searchPapers → Analysis Agent → readPaperContent + runPythonAnalysis (NumPy peak fitting) → matplotlib spectral plots with statistical verification.
"Draft LaTeX review on ring-enlargement synthesis of fluorinated triazinones."
Synthesis Agent → gap detection → Writing Agent → latexEditText (structure draft) → latexSyncCitations (Buscemi 2005 et al.) → latexCompile → publication PDF.
"Find Python code for DFT calculations on fluorinated heterocycle H-bonds."
Research Agent → paperExtractUrls (Mishra 2017) → Code Discovery → paperFindGithubRepo → githubRepoInspect → verified DFT scripts for quantum analysis.
Automated Workflows
Deep Research workflow systematically reviews 50+ fluorinated heterocycle papers via citationGraph, generating structured reports on synthesis trends (Buscemi/Pace lineage). DeepScan applies 7-step CoVe to verify NMR/DFT claims in Mishra (2017) with GRADE checkpoints. Theorizer builds mechanistic models from oxadiazole rearrangement data (Palumbo Piccionello 2006).
Frequently Asked Questions
What defines fluorinated heterocyclic compounds?
Molecules with fluorine in rings like 1,2,4-oxadiazoles and thiadiazoles, studied for stability via 19F NMR and crystallography (Buscemi et al., 2005).
What are key synthesis methods?
Ring-enlargement of oxadiazoles with hydrazine (Buscemi et al., 2005) and ANRORC rearrangements (Palumbo Piccionello et al., 2006); photochemical routes for 1-oxa-2-azoles (Buscemi et al., 2003).
What are prominent papers?
Buscemi et al. (2005, 75 citations) on triazinone oximes; Upare and Roopan (2022, 122 citations) on biological activity; Mishra and Suryaprakash (2017, 70 citations) on NMR/DFT H-bonding.
What open problems exist?
Selective control of competitive reactions (Buscemi et al., 2005); precise prediction of fluorine H-bonding in crystals (Mariaca et al., 2006); scaling photochemical syntheses.
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