2-Aminonicotinic Acid Benzyl Ester Synthesis via Aromatic Solvent Phase Transfer
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Solution Overview
Problem
Conventional methods for producing 2-aminonicotinic acid ester derivatives face issues such as high viscosity in reaction solutions, low volume efficiency, and environmental concerns due to the use of polar solvents, leading to increased by-products and incomplete reactions.
Innovation Solution
A method involving the reaction of a 2-aminonicotinic acid derivative with a benzyl derivative in an aromatic hydrocarbon solvent, using a phase transfer catalyst or tertiary amine, to produce a 2-aminonicotinic acid benzyl ester derivative, which enhances yield, purity, and volume efficiency while reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a water-soluble polar solvent is used for producing 2-aminonicotinic acid ester derivative, then the reaction can proceed, but the viscosity of the reaction solution becomes high and volume efficiency decreases
Solution Approach 1:
The patent changes the solvent parameter from water-soluble polar solvent to water-insoluble non-polar solvent (aromatic hydrocarbon solvent). This parameter change fundamentally alters the reaction medium properties, reducing viscosity and enabling high volume efficiency (exceeding 10%) while maintaining reaction effectiveness through phase transfer catalysis.
2Ease of manufacture
If a water-soluble polar solvent is used for producing 2-aminonicotinic acid ester derivative, then the reaction can proceed, but environmental load increases due to difficulty in solvent recycle and waste liquid treatment
Solution Approach 1:
The patent changes the solvent parameter from water-soluble polar solvent to water-insoluble non-polar aromatic hydrocarbon solvent. This change enables easy separation and recycle of the solvent through phase separation and distillation, significantly reducing environmental load and improving ease of manufacture.
Solution Approach 2:
The patent implements solvent recovery by discarding the water phase and recovering the aromatic hydrocarbon solvent through distillation. The recovered solvent can be reused in subsequent reactions, reducing waste and environmental impact while maintaining manufacturing efficiency.
3Productivity
If conventional esterification methods are used for producing 2-aminonicotinic acid ester derivative, then the reaction can proceed, but the reaction solution turns brown and by-products increase
Solution Approach 1:
The patent changes the solvent parameter from polar to non-polar (aromatic hydrocarbon solvent), which prevents the browning reaction and minimizes by-product formation. This parameter change maintains high yield and purity while eliminating harmful side reactions.
Solution Approach 2:
The patent introduces a phase transfer catalyst as an intermediary substance that enables the reaction between 2-aminonicotinic acid derivative and benzyl derivative in the non-polar aromatic hydrocarbon solvent system. The phase transfer catalyst mediates the reaction, allowing high productivity without the harmful effects of conventional methods.
4Productivity
If conventional esterification methods are used for producing 2-aminonicotinic acid ester derivative, then the reaction can proceed, but the reaction is not completed even by using a condensing agent
Solution Approach 1:
The patent changes the solvent parameter to water-insoluble non-polar aromatic hydrocarbon solvent and introduces phase transfer catalysis. This parameter change enables complete reaction without requiring condensing agents, simplifying the reaction conditions while achieving high productivity.
Solution Approach 2:
The phase transfer catalyst acts as an intermediary that facilitates complete reaction between the reactants in the non-polar solvent system. The catalyst enables the reaction to proceed to completion without needing additional condensing agents, reducing device complexity and improving productivity.
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 yield and purity of 2-aminonicotinic acid benzyl ester derivatives with improved volume efficiency and reduced environmental load by using aromatic hydrocarbon solvents, which can be easily reused, thus minimizing the environmental burden.
Implementation Method 1
reacting a 2-aminonicotinic acid derivative with a benzyl derivative at a high concentration by using an aromatic hydrocarbon solvent in the presence of a phase transfer catalyst
Implementation Method 2
using an aromatic hydrocarbon solvent as a poor solvent can suppress an increase in viscosity even for a high-concentration slurry and maintain stirrability
Implementation Method 3
reacting a 2-aminonicotinic acid derivative with a benzyl derivative at a high concentration by using an aromatic hydrocarbon solvent in the presence of a phase transfer catalyst or a catalyst quantity of a tertiary amine
Data Source
AI summary
The present invention provides a method for producing a 2-aminonicotinic acid benzyl ester derivative. The method includes, as a step, reacting a 2-aminonicotinic acid derivative represented by the formula [I], wherein R1 represents a hydrogen atom or a C1 to C4 alkyl group and M represents an alkali metal, with a benzyl derivative represented by the formula [II], wherein R2 represents, for example, a hydrogen atom or a halogen atom, A represents, for example, a nitrogen atom, X represents a halogen atom, and Y represents, for example, an oxygen atom, in an aromatic hydrocarbon solvent in the presence of a phase transfer catalyst or a tertiary amine.