Enzalutamide Synthesis via Room Temperature Base Catalysis
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Solution Overview
Problem
Current synthetic processes for Enzalutamide are limited due to the use of hazardous chemicals like acetone cyanohydrin and high reaction temperatures, and they result in low yields and impurity formation.
Innovation Solution
A novel process that avoids toxic reagents and maintains reaction temperatures at or below room temperature, using a mild scheme with an excess of a base such as NaOH in an organic solvent like THF, which reduces impurity formation and improves yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If acetone cyanohydrin is used in the reaction, then the synthesis can proceed, but the process becomes hazardous and unsuitable for industrial application
Solution Approach 1:
The patent removes the hazardous acetone cyanohydrin reagent from the synthesis pathway entirely, replacing it with safer alternative reagents that achieve the same transformation without the associated safety hazards, thereby enabling industrial application
Solution Approach 2:
The patent employs readily available, non-hazardous reagents that can be easily handled and disposed of, replacing the specialized hazardous reagent with common chemicals that pose no safety risk to workers or the environment
2Productivity
If high reaction temperatures are used, then the reaction proceeds faster, but impurity formation increases and yield decreases
Solution Approach 1:
The patent changes the temperature parameter from high to room temperature or below, which slows the reaction rate slightly but dramatically reduces impurity formation and increases overall yield, achieving better manufacturing precision
Solution Approach 2:
The patent introduces a base catalyst as an intermediary that enables the reaction to proceed efficiently at lower temperatures, decoupling the relationship between temperature and reaction rate, and allowing fast reaction without high temperature
3Quantity of substance
If the conventional synthesis process is used, then the reaction can be completed, but the yield is low and requires column purification
Solution Approach 1:
The patent changes multiple parameters including temperature, base catalyst type, and solvent system to achieve both high yield and simplified purification, demonstrating that parameter optimization can simultaneously improve quantity and reduce complexity
Solution Approach 2:
The patent converts what would normally be harmful conditions (room temperature, base catalysis) into beneficial outcomes by achieving high yield and selectivity, turning potential limitations into advantages that simplify the overall process
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 a higher conversion yield of Enzalutamide while minimizing the formation of impurity A, providing a safer and more efficient method for its production.
Implementation Method 1
reacting a compound of formula II with a isothiocyanate compound in the presence of a base, specifically in the presence of NaOH
Data Source
AI summary
The present invention provides a process for the efficient preparation of enzalutamide of the following formula I: