Trigonelline Synthesis Process With Low Impurity Methylation
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Solution Overview
Problem
Existing processes for the preparation of Trigonelline or pharmaceutically acceptable salts thereof are inefficient, costly, and result in low yields due to the formation of methyl ester impurities and the use of hazardous solvents like dimethyl sulfate, making them unsuitable for large-scale commercial production.
Innovation Solution
A modified process involving the controlled reaction of nicotinic acid with reduced amounts of dimethyl sulfate in specific organic solvents at lower temperatures, followed by careful solvent treatment and neutralization to minimize impurities and enhance yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If solvent-free reaction at higher temperatures is used for methylation, then reaction rate increases, but methyl ester impurity formation increases and yield decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the reaction temperature to a specific range (80-100°C) and controlling the molar ratio of dimethyl sulfate to nicotinic acid (1.05:1 to 1.2:1). These parameter adjustments resolve the contradiction by maintaining a sufficiently high reaction rate while preventing excessive methyl ester impurity formation, achieving both speed and purity requirements.
2Quantity of substance
If extraction from plant materials is used, then Trigonelline can be obtained, but large amounts of organic solvents are required and the process is time-consuming
Solution Approach 1:
The patent employs preliminary action by using chemically synthesized nicotinic acid as the starting material instead of extracting from plant materials. This approach eliminates the time-consuming extraction and refinement processes while ensuring consistent Trigonelline content, as the synthetic route provides a pure and controlled starting point for the methylation reaction.
3Productivity
If dimethyl sulfate is used in excess to drive the reaction, then conversion increases, but cost increases and hazardous waste increases
Solution Approach 1:
The patent applies partial or excessive action by using a controlled excess of dimethyl sulfate (1.05:1 to 1.2:1 molar ratio) rather than stoichiometric amounts. This slight excess ensures high conversion efficiency and drives the reaction to completion while minimizing the amount of hazardous waste generated, balancing productivity with environmental and economic considerations.
4Manufacturing precision
If multiple purification steps are used to remove impurities, then product purity increases, but process complexity and cost increase
Solution Approach 1:
The patent applies the taking out principle by selectively removing methyl ester impurities through a targeted purification step using activated carbon treatment and controlled crystallization. This approach achieves high product purity (99% or higher) by extracting only the specific impurity formed during reaction, rather than employing multiple complex purification steps, thus simplifying the overall process while maintaining high manufacturing precision.
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 process achieves high yields of Trigonelline with less than 5% impurity formation, meeting regulatory purity standards and reducing production costs, making it suitable for large-scale commercial production.
Implementation Method 1
reacting nicotinic acid with dimethyl sulfate in a suitable organic solvent to obtain N-methyl nicotinate
Implementation Method 2
converting the N-methyl nicotinate intermediate thus obtained in to trigonelline or pharmaceutically acceptable salts
Implementation Method 3
The present invention also provides ways to purify Trigonelline or pharmaceutically acceptable salts thereof
Data Source
AI summary
The present invention generally relates to an improved process for the preparation of Trigonelline or pharmaceutically acceptable salts thereof and to processes for its purification.