Thiazole Derivative Synthesis via Stable Intermediate Coupling
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Solution Overview
Problem
The existing manufacturing methods for thiazole derivatives, such as GW501516, are not cost-effective due to low yield, long reaction times, use of unstable and hazardous materials, and environmental pollution concerns, making them unsuitable for industrial-scale production.
Innovation Solution
A novel process involving reacting compounds of formula (II) with alkyl halogen acetate to form compounds of formula (IV), followed by hydrolysis, reduces the number of steps and eliminates the need for unstable intermediates, using more stable and environmentally friendly reagents, and optimizing reaction conditions for higher yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing manufacturing method using multiple steps and unstable intermediates is used, then the reaction can proceed, but the yield is extremely low (2%) and production time is long (16 hours reflux)
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing stable intermediate compounds of formula (II) before the main coupling reaction. This allows the final coupling step to proceed efficiently without requiring multiple preliminary steps, thereby increasing overall yield and reducing total reaction time.
Solution Approach 2:
The patent extracts and eliminates the problematic multi-step sequence involving unstable intermediates and long reflux periods. By using the pre-synthesized stable intermediate (II) directly in the coupling reaction, the method removes the time-consuming and low-yield steps from the process.
2Ease of manufacture
If tin powder or bromine is used as reagents, then the reaction can proceed, but environmental pollution and safety hazards increase
Solution Approach 1:
The patent replaces hazardous reagents like tin powder and bromine with more environmentally friendly alternatives. The new reagent system uses safer compounds that can be easily disposed of or degraded, reducing environmental impact while maintaining reaction effectiveness.
Solution Approach 2:
The patent converts the potentially harmful reagents into beneficial ones by selecting alternative chemicals that are less toxic and environmentally friendly. The new reagent system achieves the same chemical transformation without the harmful side effects of tin powder and bromine.
3Productivity
If excessive cesium carbonate is used to drive the coupling reaction, then the reaction proceeds, but the complexity of the process increases and cost-effectiveness decreases
Solution Approach 1:
The patent changes the reaction parameters by using a optimized amount of cesium carbonate rather than excessive amounts. The pre-synthesized stable intermediate (II) allows the coupling reaction to proceed efficiently with controlled reagent ratios, simplifying the process and improving cost-effectiveness.
4Ease of manufacture
If the existing multi-step synthesis route is used, then the product can be obtained, but the manufacturing cost increases due to low yield and multiple steps
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the stable intermediate (II) with high stability and purity. This ensures that the subsequent coupling reaction starts with high-quality material, minimizing losses and improving overall manufacturing efficiency and cost-effectiveness.
Solution Approach 2:
The patent extracts and eliminates the material losses associated with multiple low-yield steps. By using the stable intermediate (II) in a streamlined process, the method reduces material waste and improves the overall atom economy of the synthesis route.
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 new process significantly increases the yield and purity of thiazole derivatives, reducing production time and eliminating the use of hazardous materials, making the process more cost-effective and environmentally friendly.
Implementation Method 1
reacting compounds of formula (II) with alkyl halogen acetate to form compounds of formula (IV)
Implementation Method 2
followed by hydrolysis
Data Source
AI summary
The present invention provides a process for preparing thiazole derivatives of formula (I), that activate the delta subtype of the human Peroxisome Proliferator Activated Receptor (hPPAR δ), and also provides compounds of formula (II), (IV), (X), (XI) and (XII), intermediate compounds for preparation of the above compounds of formula (I).