Enzalutamide Synthesis via Catalyst-Driven Coupling
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Solution Overview
Problem
Existing synthetic methods for enzalutamide, a non-steroidal antiandrogen, face challenges such as low selectivity, high costs due to the use of large excesses of reagents like phenol, and safety concerns related to the handling of toxic substances, making them unsuitable for large-scale industrial production.
Innovation Solution
A cost-effective and safer synthetic approach for enzalutamide involves coupling the compound of formula (II) with the compound of formula (III) using a phenol derivative, which reduces the need for large excesses of reagents and minimizes the formation of impurities, thereby improving yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large excess of fragment B is used to obtain acceptable industrial yield, then the yield improves, but the cost increases and purity decreases
Solution Approach 1:
The patent changes the chemical parameters of the reaction by introducing a catalyst system (transition metal complex with ligand) and modifying reaction conditions (temperature, solvent, stoichiometry) to achieve high yield with equimolar or near-equimolar amounts of reactants, eliminating the need for large excess of fragment B
Solution Approach 2:
The patent introduces an intermediary catalyst (transition metal complex) that mediates the coupling reaction between fragment A and fragment B, enabling the reaction to proceed with high selectivity and yield without requiring large excess of reagents
2Manufacturing precision
If phenol is used in large excess to minimize oxo-enzalutamide impurity formation, then the purity improves, but safety issues arise due to phenol's corrosiveness and toxicity
Solution Approach 1:
The patent replaces the hazardous phenol (a long-lived toxic substance) with a catalyst system that can be used in small amounts and regenerated, eliminating the need to handle large quantities of toxic phenol while maintaining product purity
Solution Approach 2:
The patent converts the potentially harmful oxidation side reaction into a controlled process by using a catalyst system that promotes the desired coupling reaction while suppressing oxidation, thereby eliminating the need for large excess phenol and its associated safety hazards
3Productivity
If the coupling reaction is carried out with 2 equivalents of fragment B, then the yield reaches 60.7%, but the cost-effectiveness decreases
Solution Approach 1:
The patent optimizes reaction parameters including catalyst loading, temperature, and stoichiometry to achieve high yield with equimolar or near-equimolar amounts of reactants, dramatically improving cost-effectiveness by eliminating the need for 2 equivalents of expensive fragment B
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 allows for the production of enzalutamide with yields comparable to existing methods while using approximately half the amount of certain reagents, lowering production costs and improving safety by reducing the handling of toxic substances.
Implementation Method 1
the process comprising the step of coupling the compound of formula (II) and the compound of formula (III) to obtain the compound of formula (I)
Data Source
AI summary
An improved preparation of non-steroidal antiandrogen drugs, such as 4-[3-[4-cyano-3- (trifluoromethyl)phenyl]-5,5-dimethyl-4-oxo-2-thioxo-1-imidazolidinyl]-2-fluoro-N-methyl- benzamide and intermediates thereof, is described.