MIBK Solvent System for Methyl Pyridine Carboxylate Synthesis
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Solution Overview
Problem
Conventional methods for producing methyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate face challenges in yield and process complexity due to the use of multiple solvents and solvent exchanges, leading to losses of intermediate products.
Innovation Solution
The method involves using methyl isobutyl ketone (MIBK) as a solvent for extraction, Suzuki coupling, and deacetylation reactions, minimizing solvent exchanges and reducing the number of solvents required, thereby increasing yield and simplifying the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple solvents and solvent exchanges are used in conventional production methods, then the production process can proceed through different reaction stages, but the yield decreases and process complexity increases due to losses of intermediate products
Solution Approach 1:
MIBK serves multiple functions throughout the production process: it acts as the extraction solvent for isolating PBA from the aqueous reaction mixture, as the reaction solvent for the Suzuki coupling between PBA and methyl 4-(acetylamino)-3,6-dichloropyridine-2-carboxylate, and as the reaction solvent for the deacetylation step. This multi-functionality eliminates the need for solvent exchanges between stages, preventing intermediate product losses and simplifying the overall process while maintaining high yield
Solution Approach 2:
The use of MIBK enables continuous operation without interruption for solvent removal and replacement. The intermediate products remain dissolved in MIBK throughout the extraction, coupling, and deacetylation steps, eliminating discontinuities associated with solvent exchanges and ensuring uninterrupted productive action throughout the synthesis sequence
2Ease of manufacture
If multiple solvents are used for extraction, reaction, and deacetylation, then each reaction stage can be optimized, but the number of solvents and process steps increases
Solution Approach 1:
MIBK is used as a universal solvent for all three major process stages: extraction of PBA from aqueous phase, Suzuki coupling reaction, and deacetylation reaction. This eliminates the need to use and switch between multiple different solvents (such as ethyl acetate for extraction, then acetonitrile or toluene for reaction, then another solvent for deacetylation), thereby reducing the quantity of substances handled and simplifying the manufacturing process
Solution Approach 2:
The patent merges the functions of multiple separate solvent systems into a single continuous MIBK system. Instead of having separate extraction, reaction, and workup steps with different solvents, all operations are conducted in MIBK, combining multiple process functions into a unified solvent system that reduces the number of solvents required and simplifies the overall manufacturing procedure
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 results in a higher yield of methyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate with reduced complexity and cost, as MIBK facilitates better partitioning of intermediates and eliminates the need for additional concentration or isolation steps.
Implementation Method 1
adding methyl isobutyl ketone to an aqueous solution comprising 4-chloro-2-fluoro-3-methoxyphenylboronic acid to form an organic phase comprising the 4-chloro-2-fluoro-3-methoxyphenylboronic acid and an aqueous phase. The organic phase and the aqueous phase are separated.
Implementation Method 2
The 4-chloro-2-fluoro-3-methoxyphenylboronic acid is reacted with methyl 4-(acetylamino)-3,6-dichloropyridine-2-carboxylate in methyl isobutyl ketone to produce methyl 4-(acetylamino)-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate
Implementation Method 3
which is deacetylated in the methyl isobutyl ketone to produce methyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate
Data Source
AI summary
Methods of producing methyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate. One method comprises adding methyl isobutyl ketone to an aqueous solution comprising 4-chloro-2-fluoro-3-methoxyphenyl boronic acid to form an organic phase comprising the 4-chloro-2-fluoro-3-methoxyphenylboronic acid and an aqueous phase. The organic phase and the aqueous phase are separated. The 4-chloro-2-fluoro-3-methoxyphenylboronic acid is reacted with methyl 4-(acetylamino)-3,6-dichloropyridine-2-carboxylate in methyl isobutyl ketone to produce methyl 4-(acetylamino)-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate, which is deacetylated to produce methyl 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)pyridine-2-carboxylate.