Elafibranor Synthesis via One-Pot Alkylation and Deprotection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current processes for preparing Elafibranor are inefficient, involving multiple steps, high side reactions, and low yields, with the need for a more cost-effective and industrially feasible method.

Innovation Solution

A one-pot reaction process in an aprotic solvent with a strong base, optionally with a polar co-solvent, where compounds (II), (III), and (V) are combined, allowing for direct alkylation and subsequent acidification to produce Elafibranor, reducing reaction steps and side reactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional multi-step processes are used for preparing elafibranor, then the reaction can proceed with standard reagents, but the number of reaction steps increases and overall yield decreases

Engineering Contradiction:

Improveoverall yieldVSAvoidnumber of reaction steps

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines multiple reaction steps into a single one-pot process. Specifically, the alkylation of phenol (II) with 2-halo-2-methylpropanoic acid (III) and the subsequent formation of the enone structure are merged into one continuous reaction sequence without isolating intermediates, thereby reducing the number of steps and improving overall yield

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs preliminary protection of the carboxylic acid group as an ester or other protecting group before the alkylation reaction. This preliminary action prevents side reactions and decomposition that would otherwise occur with free carboxylic acid groups, enabling successful one-pot synthesis

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the process uses standard alkylation conditions, then the reaction can proceed, but side reactions occur and decomposition of reagents is observed

Engineering Contradiction:

Improvereaction efficiencyVSAvoidside reactions and decomposition

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies reaction parameters including using specific bases (potassium carbonate, cesium carbonate, or hydroxides), controlling temperature ranges (reflux or elevated temperatures), and selecting appropriate solvents (acetonitrile, DMF, DMSO, or alcohols) to optimize the alkylation reaction and minimize side reactions and decomposition

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The carboxylic acid group is preliminarily protected as an ester or other protecting group before alkylation. This preliminary protection prevents decomposition of the carboxylic acid group during the alkylation reaction and eliminates side reactions that would otherwise occur

Inventive Principle:

Principle #10Preliminary action

3Productivity

If additional hydrolysis steps are added to obtain elafibranor from protected intermediates, then the final product can be obtained, but the number of reaction steps increases

Engineering Contradiction:

Improvedirect production of elafibranorVSAvoidnumber of reaction steps

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Instead of protecting the carboxylic acid group and requiring subsequent hydrolysis, the patent uses preliminary esterification or protecting group installation in a way that allows direct conversion to the free acid form of elafibranor. The protecting group strategy is designed so that the final product is obtained directly after the one-pot reaction, eliminating the need for additional hydrolysis steps

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges the alkylation reaction and the deprotection/hydrolysis steps into a single one-pot process. The reaction conditions are optimized so that the protecting group is removed in situ or the ester intermediate is directly converted to the free acid form of elafibranor without isolation or additional treatment steps

Inventive Principle:

Principle #5Merging (Combining)

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 results in higher yields, shorter reaction times, and fewer side reactions, providing a more efficient and cost-effective synthesis of Elafibranor with improved purity.

Implementation Method 1

mixing compounds (II) and (III) wherein X is an alkali—or a alkali-earth metal R is —CHO or in an aprotic solvent, which is optionally in admixture with a protic co-solvent, in the presence of a strong base

Methodology Applied

Scientific EffectDeprotonation: