Pemetrexed Intermediate Synthesis via Heck-Coupling and Halogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current synthesis processes for pemetrexed disodium heptahydrate are inefficient due to multiple steps and low overall yield, with intermediates being unstable and difficult to purify, making them unsuitable for industrial production.
Innovation Solution
A process involving the reaction of specific compounds using Heck-coupling reactions, halogenation, and condensation with 2,4-diamino-6-hydroxy pyrimidine to produce a highly pure pemetrexed intermediate, which can be converted into pemetrexed or its salts, avoiding the need for intermediate purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional multi-step synthesis processes are used for pemetrexed disodium heptahydrate, then the synthesis can be performed with conventional methods, but the overall yield is low and the process is not suitable for industrial production
Solution Approach 1:
The synthesis process is divided into distinct modular steps: Heck coupling reaction to form the intermediate, halogenation to introduce the halogen substituent, and condensation with 2,4-diamino-6-hydroxy pyrimidine to form the final product. Each step is optimized independently to maximize yield and minimize complexity.
Solution Approach 2:
The Heck coupling reaction is performed first to pre-form the key intermediate structure before subsequent halogenation and condensation steps. This preliminary formation of the carbon-carbon bond creates a stable intermediate that facilitates the remaining transformations with higher efficiency.
2Reliability
If conventional synthesis routes are used, then the process can be implemented with standard procedures, but the intermediates are unstable and difficult to purify
Solution Approach 1:
A stable halogenated intermediate is introduced as a mediator between the Heck coupling product and the final condensation step. This intermediate serves as a stable isolable compound that can be purified by standard techniques before proceeding to the final reaction, thereby solving both stability and purification issues.
Solution Approach 2:
The chemical structure of intermediates is modified by introducing halogen substituents that enhance stability. The parameters of the intermediate compounds are changed to achieve optimal balance between reactivity for subsequent steps and stability for isolation and purification.
3Stability of the object's composition
If additional purification steps are added to stabilize intermediates, then intermediate stability improves, but the process complexity and time increase
Solution Approach 1:
The synthesis process is designed so that the halogenated intermediate can be directly used in the condensation reaction without extensive purification. The reaction conditions are optimized to allow continuous processing where the intermediate is carried forward from one step to the next with minimal intervention, maintaining stability while reducing time loss.
4Manufacturing precision
If multiple synthesis steps are used, then the desired product can be obtained, but the process is inefficient for industrial production
Solution Approach 1:
Reaction parameters such as temperature, solvent, and catalyst loading are optimized for each step to maximize product purity while minimizing the number of required purification operations. The Heck coupling uses specific palladium catalysts and base conditions to achieve high purity intermediates that require minimal further purification.
Solution Approach 2:
The synthesis route is designed to produce consistent, reproducible intermediates that can be reliably scaled from laboratory to industrial production. The standardized procedure for forming the halogenated intermediate ensures that the same high-purity product is obtained regardless of scale, facilitating industrial efficiency.
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 process achieves high purity pemetrexed intermediates and final products with improved stability and yield, making it more suitable for industrial production compared to existing methods.
Implementation Method 1
reacting a compound of the following formula VII a compound of the following formula VIII, and a catalyst suitable for Heck-coupling reactions to obtain a compound of the following formula IX
Implementation Method 2
reacting the compound of formula IX and a halogenating agent to obtain a compound of the following formula X
Implementation Method 3
reacting the compound of formula X and 2,4-diamino-6-hydroxy pyrimidine to obtain the compound of formula VI
Data Source
AI summary
Provided are processes for preparing intermediates of pemetrexed.