Cariprazine Synthesis Using Formic Acid for Faster Reductive Amination
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Solution Overview
Problem
Existing processes for preparing Cariprazine are inefficient, requiring long reaction times and generating hazardous by-products, making them unsuitable for industrial-scale production.
Innovation Solution
A process involving the use of formic acid for the reduction reaction of the compound of formula (II) to produce compound (III), which is completed in under 1 hour, reducing reaction time and minimizing waste generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium triacetoxyborohydride is used for reductive amination in existing processes, then the reaction can proceed under alkaline conditions, but the reaction time becomes very long (18-20 hours)
Solution Approach 1:
The patent changes the chemical parameters of the reductive amination process by replacing sodium triacetoxyborohydride with formic acid as the reducing agent. This parameter change transforms the reaction conditions from alkaline to acidic, enabling the reaction to proceed much faster (completing in under 1 hour instead of 18-20 hours) while maintaining reaction completeness and reliability.
2Reliability
If sodium triacetoxyborohydride is used for reductive amination, then the reaction can be performed, but hazardous by-products are generated and the reagent is moisture sensitive and expensive
Solution Approach 1:
The patent converts the harmful effects of using sodium triacetoxyborohydride (hazardous by-products, moisture sensitivity, expense) into benefits by replacing it with formic acid. Formic acid provides a cleaner reaction profile with minimal hazardous waste, is not moisture sensitive, and is significantly cheaper, thereby eliminating the harmful factors while maintaining reaction feasibility.
Solution Approach 2:
The patent replaces the expensive and problematic sodium triacetoxyborohydride with formic acid, which is a cheaper, more stable, and easier-to-handle reagent. Formic acid can be used in excess and decomposes harmlessly into carbon dioxide and water, eliminating the need for expensive, moisture-sensitive reagents and their associated waste handling requirements.
3Manufacturing precision
If existing synthesis routes are used for Cariprazine, then the compound can be prepared, but the processes are not suitable for industrial manufacturing due to long cycle times
Solution Approach 1:
The patent applies parameter changes to the reductive amination step by replacing sodium triacetoxyborohydride with formic acid, transforming the reaction time from 18-20 hours to under 1 hour. This dramatic reduction in cycle time directly improves manufacturing productivity and efficiency while maintaining the ability to synthesize Cariprazine with the required manufacturing precision.
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 process achieves a more efficient and sustainable preparation of Cariprazine by significantly shortening the reaction time and reducing by-product waste, enhancing industrial productivity.
Implementation Method 1
reduction reaction of the compound of formula (II) with formic acid to give a compound of formula (III)
Data Source
AI summary
An improved process for the preparation of Cariprazine of formula (1):is provided. The process includes converting an imino-piperazine intermediate to give an amino-piperazine intermediate by reaction with formic acid.