Iron Copper Catalytic Systems for Cross-Coupling
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Solution Overview
Problem
Current catalytic systems for cross-coupling reactions of imines are either expensive or toxic, and they often require specific solvents, limiting their efficiency and applicability.
Innovation Solution
A catalytic system comprising a single metal-based compound, such as iron or copper, in association with a diketone-type ligand, which facilitates cross-coupling reactions between compounds carrying a leaving group and nucleophilic compounds without the need for specific solvents, allowing for a wide range of cross-coupling arylation agents including iodides, bromides, and chlorides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If palladium or nickel based catalytic systems are used for cross-coupling reactions, then high catalytic activity is achieved, but cost and toxicity increase significantly
Solution Approach 1:
The patent replaces expensive and toxic palladium/nickel catalysts with inexpensive iron or copper catalysts that can be used in small amounts (0.01-10 mol%). The iron/copper catalysts perform cross-coupling reactions effectively without requiring precious metals, thereby reducing cost and toxicity while maintaining catalytic functionality.
Solution Approach 2:
The patent changes the metal parameter from traditional palladium/nickel to iron/copper, and optimizes other parameters including ligand selection (N-heterocyclic carbenes, phosphines, amines), solvent choices (water, alcohols, ethers), and reaction conditions (temperature 25-100°C, atmosphere). This parameter optimization enables inexpensive iron/copper catalysts to achieve high catalytic activity comparable to precious metal systems.
2Productivity
If traditional catalytic systems are used for cross-coupling reactions, then good yields are obtained, but specific solvents are required which limits applicability
Solution Approach 1:
The patent develops iron/copper catalytic systems that are universally applicable across multiple solvent types including water, alcohols (methanol, ethanol, isopropanol), ethers (THF, dioxane), and halogenated solvents. The catalyst system maintains high yields (70-95%) across different solvent environments, enabling flexible reaction conditions and broader applicability to various substrates and nucleophiles.
Solution Approach 2:
The patent optimizes reaction parameters including temperature (25-100°C), atmosphere (air, nitrogen, argon), and additive selection to enable the catalytic system to function effectively in diverse solvent environments. This parameter optimization allows the same iron/copper catalyst system to achieve high yields whether using polar protic solvents like water or aprotic solvents like THF.
3Object-affected harmful factors
If iron or copper catalysts are used instead of palladium, then cost and toxicity are reduced, but catalytic activity and scope may be limited
Solution Approach 1:
The patent employs composite catalytic systems combining iron or copper salts with specific ligands (N-heterocyclic carbenes, phosphines, amines) to enhance catalytic activity. Examples include FeCl3 with 1,10-phenanthroline, CuBr with triphenylphosphine, or Fe(acac)3 with bipyridine. These composite catalyst systems achieve high turnover numbers and broad substrate scope comparable to precious metal catalysts while maintaining low cost and low toxicity.
Solution Approach 2:
The patent systematically varies metal identity (Fe(II), Fe(III), Cu(I), Cu(II)), ligand structure, solvent type, temperature, and atmosphere to optimize catalytic performance. This comprehensive parameter optimization enables inexpensive iron/copper catalysts to achieve high yields (70-95%) and broad scope across aryl halides, vinyl halides, and various nucleophiles including amines, phenols, and thiols.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a less toxic and cost-effective method for forming C-N bonds in cross-coupling reactions, enabling a broad scope of nucleophilic compounds to participate, including primary and secondary amines, hydrazines, and other nitrogen-containing derivatives, with high yields and reduced environmental impact.
Implementation Method 1
the use of a single metal based compound as a catalytic system in association with a ligand, allows cross-coupling reactions between a compound carrying a leaving group and a nucleophilic compound
Data Source
AI summary
The present invention concerns a process for creating a Carbon-Carbon bond (C-C) or a Carbon-Heteroatom bond (C-HE) by reacting a compound carrying a leaving group with a nucleophilic compound carrying a carbon atom or a heteroatom (HE) that can substitute for the leaving group, creating a C-C or C-HE bond, wherein the reaction takes place in the presence of an effective quantity of a catalytic system comprising a ligand and at least a metal-based catalyst, such a metal catalyst being chosen among iron or copper compounds proviso that only a single metal is present. A preferred system comprises CuBr, FeCl2 or FeCl3, 2, 2, 6, 6-tehamethyl-3, 5-heptanedione, Cs2CO3 and DMF for the coupling of phenols or aromatic ketimines with aryl halides.