Oxalic Amide Ligands for Copper-Catalyzed Aryl Chloride Coupling
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Solution Overview
Problem
Current copper-catalyzed coupling reactions for aryl chlorides are inefficient due to the high energy of the C-Cl bond, requiring expensive palladium catalysts and sterically hindered ligands, and are limited to specific substrates and harsh conditions.
Innovation Solution
A copper-catalyzed coupling system using oxalic amide ligands, copper catalysts, and a base in an appropriate solvent, which facilitates the formation of C-N, C-O, and C-S bonds with aryl chlorides under mild conditions, enabling a wide range of substrates and reducing catalyst loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If copper catalysts are used for coupling reaction of aryl chlorides, then cost is reduced and availability is improved, but reaction efficiency is insufficient and substrate scope is limited
Solution Approach 1:
The patent introduces oxalic amide ligands as intermediary compounds that mediate between the copper catalyst and aryl chloride substrate. These ligands form copper-oxalic amide complexes that act as effective intermediaries, enabling the copper catalyst to activate the inert C-Cl bond through coordinated interaction, thus resolving the inefficiency of direct copper catalysis
Solution Approach 2:
The patent creates composite catalytic systems by combining copper salts with oxalic amide ligands to form copper-oxalic amide complex catalysts. This composite material integrates the low-cost advantage of copper with the high reactivity enabled by the oxalic amide ligand, achieving both cost-effectiveness and high reaction efficiency
2Productivity
If sterically hindered phosphine ligands are used to promote coupling of aryl chlorides, then coupling efficiency is improved, but device complexity and ligand complexity increase
Solution Approach 1:
The patent replaces complex, expensive sterically hindered phosphine ligands with simple, inexpensive oxalic amide ligands. These simpler ligands achieve comparable or superior catalytic activity without requiring elaborate molecular structures, thus reducing ligand complexity while maintaining high coupling efficiency
Solution Approach 2:
The patent changes the chemical parameters of the ligand system by transitioning from phosphine-based ligands to oxalic amide-based ligands. This parameter change involves altering the donor atoms, steric profile, and electronic properties of the ligand, resulting in a simpler molecular structure that maintains high catalytic activity
3Productivity
If palladium catalysts are used for coupling of aryl chlorides, then coupling efficiency is improved, but catalyst cost increases
Solution Approach 1:
The patent creates a copper-based catalytic system that copies the high efficiency of palladium catalysis. By using oxalic amide ligands to modify the copper catalyst, the system replicates the superior performance of expensive palladium catalysts while maintaining the cost advantage of copper, thus providing a cost-effective alternative with comparable efficiency
4Speed
If high reaction temperature is used to promote coupling of aryl chlorides, then reaction rate is improved, but energy consumption and harsh conditions increase
Solution Approach 1:
The copper-oxalic amide complex acts as an intermediary that lowers the activation energy barrier for the coupling reaction. This intermediary enables the reaction to proceed at lower temperatures by providing an alternative reaction pathway with reduced energy requirements, thus maintaining high reaction rates while reducing energy consumption
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 system efficiently promotes the coupling of aryl chlorides with various nucleophiles, offering a cost-effective and economically viable method for large-scale applications with improved reaction conditions and substrate compatibility.
Implementation Method 1
The transition metal-catalyzed coupling reaction of aryl halides with suitable nucleophiles... is very efficient for the formation of C-N, C-C, C-O, C-S, and C-P bonds
Data Source
AI summary
The present invention provides oxalic amide ligands and uses thereof in copper-catalyzed coupling reaction of aryl halides. Specifically, the present invention provides a use of a compound represented by formula I, wherein definitions of each group are described in the specification. The compound represented by formula I can be used as a ligand in copper-catalyzed coupling reaction of aryl halides for the formation of C-N, C-O and C-S bonds.