Subtopic Deep Dive
Click Chemistry Synthesis of Tetrazoles
Research Guide
What is Click Chemistry Synthesis of Tetrazoles?
Click Chemistry Synthesis of Tetrazoles uses Huisgen 1,3-dipolar cycloadditions of azides with nitriles, acyl cyanides, or sulfonyl cyanides to form 5-substituted tetrazoles under thermal or catalyzed conditions.
Introduced by Demko and Sharpless in 2002, these methods enable high-yield synthesis without metal catalysts by heating neat mixtures at 120–130°C (Demko and Sharpless, 2002; 447 citations). Variants include organoaluminum azide cycloadditions with nitriles under mild conditions (Aureggi and Sedelmeier, 2007; 173 citations). Over 10 key papers document optimizations for acyl and sulfonyl tetrazoles.
Why It Matters
Click tetrazole synthesis supports drug discovery by providing bioisosteres for carboxylic acids in high throughput (Mittal and Awasthi, 2019). Demko and Sharpless methods (2002; 447 and 411 citations) enable library generation for medicinal chemistry pipelines with simple workups. Scalable reactions tolerate functional groups, accelerating hit-to-lead optimization in pharmaceuticals.
Key Research Challenges
Azide Handling Safety
Azides pose explosion risks during synthesis and purification (Aureggi and Sedelmeier, 2007). Demko and Sharpless thermal methods require high temperatures, limiting substrate scope (2002). Safer alternatives like organoaluminum azides address toxicity but need scalability improvements.
Regioselectivity Control
Huisgen cycloadditions can form 1,4- and 1,5-regioisomers without catalysts (Demko and Sharpless, 2002). Copper or ruthenium catalysis improves selectivity but introduces metal residues. Optimizing ligands and solvents remains key for pure products.
Scalability Limitations
Neat reactions scale poorly due to heat transfer issues (Demko and Sharpless, 2002; 269 citations). Aqueous or catalyzed variants like FeTSPP show promise but require efficiency gains (El-Remaily and Elhady, 2019). Industrial library synthesis demands greener, higher-yield protocols.
Essential Papers
A click chemistry approach to tetrazoles by Huisgen 1,3-dipolar cycloaddition: synthesis of 5-acyltetrazoles from azides and acyl cyanides.
Zachary Demko, K. Barry Sharpless · 2002 · PubMed · 447 citations
A Click Chemistry Approach to Tetrazoles by Huisgen 1,3-Dipolar Cycloaddition: Synthesis of 5-Sulfonyl Tetrazoles from Azides and Sulfonyl Cyanides We thank the National Institute of General Medical Sciences, National Institutes of Health (GM-28384), the National Science Foundation (CHE-9985553), the Skaggs Institute for Chemical Biology for a Predoctoral Fellowship (Z.D.), and the W. M. Keck Foundation for financial support. Dedicated to Professor Rolf Huisgen, the pioneer of this large and extremely useful family of reactions.
Zachary Demko, K. Barry Sharpless · 2002 · Angewandte Chemie International Edition · 411 citations
A Click Chemistry Approach to Tetrazoles by Huisgen 1,3-Dipolar Cycloaddition: Synthesis of 5-Acyltetrazoles from Azides and Acyl Cyanides We thank the National Institute of General Medical Sciences, National Institutes of Health (GM-28384), the National Science Foundation (CHE-9985553), the Skaggs Institute for Chemical Biology for a Predoctoral Fellowship (Z.D.), and the W. M. Keck Foundation for financial support.
Zachary Demko, K. Barry Sharpless · 2002 · Angewandte Chemie International Edition · 269 citations
Click chemistry: Acyl cyanides react with alkyl azides in high yield by heating at 120–130°C (see scheme). The reactions are run neat, and the workup is simple. When p-nitrophenyl cyanoformate is u...
1,3‐Dipolar Cycloaddition: Click Chemistry for the Synthesis of 5‐Substituted Tetrazoles from Organoaluminum Azides and Nitriles
Valentina Aureggi, Gottfried Sedelmeier · 2007 · Angewandte Chemie International Edition · 173 citations
Cheap and safe: Conventional methods to prepare tetrazoles employ dangerous, toxic reagents. A new route to these heterocycles (see scheme) uses inexpensive and nontoxic dialkyl aluminum azides. Th...
Recent Advances in the Synthesis of 5-Substituted 1H-Tetrazoles: A Complete Survey (2013–2018)
R. Mittal, Satish Kumar Awasthi · 2019 · Synthesis · 82 citations
Tetrazoles are synthetic organic heterocyclic compounds comprising of high nitrogen content among stable heterocycles. Tetrazoles, chiefly 5-substituted 1H-tetrazoles have been used as a bioisoster...
A novel approach for the synthesis of 5-substituted-1H-tetrazoles
Batool Akhlaghinia, Soodabeh Rezazadeh · 2012 · Journal of the Brazilian Chemical Society · 71 citations
A series of 5-substituted-1H-tetrazoles (RCN4H) have been synthesized by cycloaddition reaction of different aryl and alkyl nitriles with sodium azide in DMSO using CuSO4•5H2O as catalyst. A wide v...
Iron (III)‐porphyrin Complex FeTSPP as an efficient catalyst for synthesis of tetrazole derivatives <i>via</i> [2 + 3]cycloaddition reaction in aqueous medium
Mahmoud Abd El Aleem Ali Ali El‐Remaily, Omar M. Elhady · 2019 · Applied Organometallic Chemistry · 42 citations
The metal complex (5,10,15,20‐tetrakis‐(4‐sulfonatophenyl)‐porphyrin‐iron (III) chloride (FeTSPP) was new employed in an environmentally benign protocol as an efficient catalyst for a “click” chemi...
Reading Guide
Foundational Papers
Start with Demko and Sharpless (2002; 447 citations) for acyl tetrazoles and (411 citations) for sulfonyl tetrazoles to grasp thermal Huisgen basics; then Aureggi and Sedelmeier (2007; 173 citations) for safer aluminum azide method.
Recent Advances
Mittal and Awasthi (2019; 82 citations) surveys 2013–2018 advances; El-Remaily and Elhady (2019; 42 citations) on FeTSPP aqueous catalysis.
Core Methods
Huisgen thermal cycloaddition (120–130°C, neat); organoaluminum azide with nitriles; CuSO4-catalyzed nitrile azide (Akhlaghinia and Rezazadeh, 2012); FeTSPP in water.
How PapersFlow Helps You Research Click Chemistry Synthesis of Tetrazoles
Discover & Search
Research Agent uses searchPapers and citationGraph on Demko and Sharpless (2002, 447 citations) to map 20+ related works via forward/backward citations. exaSearch queries 'Huisgen cycloaddition tetrazoles acyl cyanides' for hidden preprints; findSimilarPapers expands to sulfonyl variants (Demko and Sharpless, 2002).
Analyze & Verify
Analysis Agent runs readPaperContent on Demko and Sharpless (2002) abstracts to extract yields and conditions, then verifyResponse with CoVe checks regioselectivity claims against 5 papers. runPythonAnalysis parses reaction data into pandas for yield statistics; GRADE assigns A-grade evidence to thermal methods (447 citations).
Synthesize & Write
Synthesis Agent detects gaps in scalable catalysts post-2007 (Aureggi and Sedelmeier), flags contradictions in azide safety. Writing Agent uses latexEditText for reaction schemes, latexSyncCitations for 10 Demko papers, latexCompile for Overleaf export; exportMermaid diagrams cycloaddition mechanisms.
Use Cases
"Extract yield data from Demko-Sharpless click tetrazole papers and plot vs temperature"
Research Agent → searchPapers('Demko Sharpless tetrazoles 2002') → Analysis Agent → readPaperContent(3 papers) → runPythonAnalysis(pandas plot yields/temps) → matplotlib yield distribution graph.
"Write LaTeX section on Huisgen cycloaddition for tetrazole review with citations"
Synthesis Agent → gap detection (post-2002 advances) → Writing Agent → latexEditText('Huisgen section') → latexSyncCitations(Demko 2002 et al.) → latexCompile → PDF with schemes.
"Find GitHub repos with code for simulating tetrazole cycloaddition kinetics"
Research Agent → searchPapers('tetrazole click simulation') → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → Python kinetics models and Jupyter notebooks.
Automated Workflows
Deep Research workflow scans 50+ tetrazole papers via citationGraph from Demko (2002), outputs structured report with yield tables and gap analysis. DeepScan's 7-step chain verifies Sharpless methods: searchPapers → readPaperContent → runPythonAnalysis(yields) → CoVe → GRADE. Theorizer generates hypotheses on FeTSPP catalyst improvements from El-Remaily (2019).
Frequently Asked Questions
What defines Click Chemistry Synthesis of Tetrazoles?
Huisgen 1,3-dipolar cycloadditions of azides with nitriles or cyanides, often thermal at 120–130°C, as in Demko and Sharpless (2002).
What are key methods?
Thermal reactions of azides with acyl/sulfonyl cyanides (Demko and Sharpless, 2002; 447 citations); organoaluminum azide cycloadditions (Aureggi and Sedelmeier, 2007).
What are key papers?
Demko and Sharpless (2002) acyl tetrazoles (447 citations), sulfonyl tetrazoles (411 citations); Aureggi and Sedelmeier (2007; 173 citations).
What open problems exist?
Scalable, metal-free regioselective synthesis; safer azide alternatives; green solvents for library scale (Mittal and Awasthi, 2019).
Research Synthesis of Tetrazole Derivatives with AI
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