Trans GPCR Modulator Synthesis for High Isomeric Purity
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Solution Overview
Problem
Existing methods for synthesizing trans isomeric forms of G protein-coupled receptor modulators, such as CCR4 inhibitors, often produce racemic mixtures, making them economically inefficient for commercial scale-up due to the inclusion of undesired cis isomers or diastereomers.
Innovation Solution
A method involving the use of a 1,4-dihydropyridine as a carboxylic acid-directed reducing agent to synthesize trans isomeric forms of G protein-coupled receptor modulators, achieving at least 80% trans isomerically pure compounds by reacting compounds of formulas (I) and (II), with specific substitutions and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If known synthetic processes are used to make trans isomeric G protein-coupled receptor modulators, then the desired trans isomer can be produced, but racemic mixtures of cis and trans isomers are generated, reducing manufacturing precision and economic efficiency
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions and reagent selection to achieve high trans isomeric purity. Specifically, the use of a carboxylic acid-directed reducing agent (such as triethylsilane with a carboxylic acid catalyst) changes the chemical parameters of the reduction process, enabling selective formation of the trans isomer over the cis isomer, thus achieving at least 80% trans isomeric purity while maintaining manufacturing efficiency
Solution Approach 2:
The patent employs an intermediary approach by using a carboxylic acid-directed reducing agent as a mediator in the synthesis process. The carboxylic acid (e.g., p-toluenesulfonic acid) acts as a catalyst that directs the reduction to preferentially form the trans isomer, serving as an intermediary that controls the stereochemical outcome without being consumed in the reaction, thereby improving both isomeric purity and process efficiency
2Manufacturing precision
If conventional reduction methods are used, then the synthesis process is simple, but the trans isomeric purity remains low due to formation of cis isomers
Solution Approach 1:
The patent changes the chemical parameters by selecting specific reagents (carboxylic acid-directed reducing agents like triethylsilane combined with carboxylic acid catalysts) that inherently provide high trans selectivity. This parameter change achieves at least 80% trans isomeric purity without requiring complex reaction setups or multiple purification steps, thus improving manufacturing precision while keeping the synthesis process relatively simple
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 method enables the production of trans isomeric forms of G protein-coupled receptor modulators with high purity, addressing the inefficiencies of previous methods and facilitating cost-effective commercial production.
Implementation Method 1
the method comprises using a 1,4-dihydropyridine as a carboxylic acid directed reducing agent of an imine or eneamine to make the modulator
Data Source
AI summary
Disclosed herein, inter alia, methods of synthesis of trans isomeric forms of G protein-coupled receptor modulators of high trans isomeric purity.