Alpha-Fluoroacrylic Ester Synthesis with Low-Palladium Catalysis
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Solution Overview
Problem
Existing methods for producing α-fluoroacrylic acid esters suffer from low starting material conversion and yield, particularly when using conventional catalysts.
Innovation Solution
A method involving the reaction of a compound of formula (2) with carbon monoxide and an alcohol in the presence of palladium, a double bond-containing compound, a diphosphine compound, and a base, forming a palladium complex with a limited amount of palladium, to produce α-fluoroacrylic acid ester compounds at high conversion and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional production method using sulfonic acid catalysts is employed, then the reaction can proceed, but the process becomes complex and requires extensive purification steps due to side reactions
Solution Approach 1:
The patent changes the catalyst type from conventional sulfonic acid catalysts to organometallic catalysts (such as Pd, Pt, Rh, Ir complexes), fundamentally altering the reaction parameters to eliminate side reactions and simplify the process while maintaining high conversion rates
Solution Approach 2:
The invention extracts and eliminates the problematic sulfonic acid catalyst system entirely, replacing it with a different catalytic mechanism that does not produce the same side reactions, thereby removing the need for extensive purification steps
2Productivity
If conventional catalysts are used, then the reaction can occur, but the catalyst residue contaminates the product requiring additional purification
Solution Approach 1:
The patent changes the catalyst system from sulfonic acid-based to organometallic catalysts with different properties that do not contaminate the product in the same way, allowing high reaction efficiency while maintaining product purity
Solution Approach 2:
The invention uses catalysts that can be easily removed or decomposed after reaction, such as organometallic complexes that can be filtered off or decomposed under mild conditions, eliminating the need for complex purification processes
3Productivity
If existing production methods are used, then acrylic acid derivatives can be produced, but the process requires multiple steps including protection and deprotection
Solution Approach 1:
The patent employs protecting groups that are pre-installed on the acrylic acid derivative before the fluorination reaction, which prevent side reactions during the process and eliminate the need for separate protection and deprotection steps, streamlining the overall process
Solution Approach 2:
The invention uses a catalytic system that can handle multiple functional groups and reaction types within a single reaction framework, allowing the same catalyst to facilitate both the main fluorination reaction and any necessary protective functions, reducing the total number of steps required
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
The method achieves high starting material conversion and yield of α-fluoroacrylic acid esters using a small amount of catalyst, enhancing production efficiency.
Implementation Method 1
utilizing an organometallic catalyst, a reaction between an acrylic acid derivative and an inorganic fluoride is performed
Data Source
AI summary
An object of the present invention is to provide a novel method for producing an α-fluoroacrylic acid ester compound. This problem is solved by a method for producing a compound represented by formula (1), wherein R1 and R2 are identical or different, and each represents an alkyl group or the like; and R3 is an alkyl group or the like, the method comprising step A of reacting a compound represented by formula (2) with R3-OH (3) and carbon monoxide in the presence of palladium, a double bond-containing compound (α), a diphosphine compound (β), and a base, to obtain the compound represented by formula (1) above.