Pyrazole-4-carboxylic acid production via regioselective oxidation
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Solution Overview
Problem
Current methods for producing pyrazole-4-carboxylic acid derivatives are either inefficient or require specialized reactors and conditions, limiting their industrial applicability and selectivity.
Innovation Solution
A novel production method involving the reaction of specific fluorinated compounds with bases and solvents under controlled conditions, allowing for regioselective conversion on the pyrazole ring to produce pyrazole derivatives with high yield and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods are used to produce pyrazole-4-carboxylic acid derivatives, then production is possible, but the methods require specialized reactors and special reaction conditions, increasing device complexity and reducing ease of manufacture
Solution Approach 1:
The patent changes the reaction parameters by using standard reaction conditions (common solvents, moderate temperatures, atmospheric pressure) instead of specialized conditions, thereby simplifying the manufacturing process and reducing device complexity while maintaining product yield and quality
Solution Approach 2:
The patent employs readily available, inexpensive reagents and standard equipment that can be easily replaced or disposed of, rather than requiring expensive, specialized reactors and catalysts, thus improving ease of manufacture and reducing investment in complex equipment
2Manufacturing precision
If conventional oxidation methods are used to convert aldehyde to carboxylic acid, then carboxylic acid can be obtained, but the selectivity is low and multiple by-products are formed, reducing manufacturing precision
Solution Approach 1:
The patent introduces a specific intermediary compound (3-acetyl-4-ethoxy-1,1,1-trifluorobut-3-en-2-one) that mediates the reaction between substituted hydrazines and fluorinated compounds, enabling regioselective formation of the desired pyrazole derivative while minimizing by-product formation and improving manufacturing precision
Solution Approach 2:
The patent achieves local quality by directing the reaction to occur specifically at the 4-position of the pyrazole ring through the designed intermediary compound, ensuring that substitution occurs only at the desired location rather than multiple positions, thereby improving selectivity and reducing material loss
3Productivity
If multiple synthesis steps are used to produce pyrazole derivatives, then the desired product can be obtained, but the production time increases and productivity decreases
Solution Approach 1:
The patent merges multiple synthesis steps into a single pot reaction by designing an intermediary compound that enables sequential transformations without isolation, thereby reducing production time and improving productivity while maintaining product quality
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 enables the production of pyrazole derivatives as intermediates for medicines or agrichemicals with improved industrial feasibility and economic viability, using readily available materials and standard reaction conditions.
Implementation Method 1
Non-Patent Document 2 describes the synthesis of 3- and 5-trifluoromethylpyrazole-4-carboxylic acids by the hydrolysis of 3- and 5-trifluoromethyl-4-trifluoroacetyl-pyrazoles with aqueous potassium hydroxide.
Implementation Method 2
As a method of converting the substituent at the 4-position on the pyrazole ring to a carboxyl group to obtain a carboxylic acid, a method of oxidizing an aldehyde to a carboxylic acid is known
Data Source
AI summary
The invention relates to a method of producing a pyrazole derivative represented by the following formula (6), which comprises reacting a compound represented by the following formula (5) with an oxidant; wherein R1 is a hydrogen atom or a halogen atom, R2 is a C1-8 alkyl group, R3 is a hydrogen atom or a C1-8 alkyl group, X1 and X2 are each independently a fluorine atom or a chlorine atom, and Z1 is a hydrogen atom or a C1-8 alkyl group.