Amino Alcohol-Boron-Binol Complex for Chiral Resolution
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Solution Overview
Problem
Current methods for producing optically active amino alcohol derivatives often result in low yields and optical purity, particularly due to the limitations of chiral resolution techniques and the use of racemic compounds, which can lead to side effects in pharmaceutical applications.
Innovation Solution
The development of an amino alcohol-boron-binol complex as an intermediate for chiral resolution, involving the reaction of a racemic compound with a boron compound and (R)- or (S)-binol, followed by hydrolysis to obtain optically active amino alcohol derivatives with high optical purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chiral resolution is performed using conventional methods (e.g., using tartaric acid), then enantiomers can be separated, but the yield is very low and multiple rounds of recrystallization are required
Solution Approach 1:
The patent introduces an amino alcohol-boron-binol complex as an intermediary substance to facilitate chiral resolution. This complex acts as a mediator that forms diastereomeric salts with the racemic amino alcohol, enabling effective separation of enantiomers while maintaining high yield. The complex includes boron compound, binol, and amino alcohol in specific molar ratios, creating a structured intermediary that improves both separation efficiency and productivity.
Solution Approach 2:
The patent optimizes the molar ratios of components in the amino alcohol-boron-binol complex to achieve optimal resolution performance. By adjusting the parameters of the complex composition (boron compound:binol:amino alcohol in 1:0.45-0.6:1 ratio) and reaction conditions, the method achieves high optical purity (>98% ee) while maintaining high yield (>70%), resolving the contradiction between manufacturing precision and productivity.
2Productivity
If racemic compounds are used in pharmaceutical production, then production volume is maximized, but side effects occur due to inactive or harmful enantiomers
Solution Approach 1:
The patent applies preliminary action by performing chiral resolution at the beginning of the production process rather than after producing racemic mixtures. The amino alcohol-boron-binol complex enables separation of enantiomers in the initial step, ensuring that only the pharmacologically active enantiomer proceeds through subsequent synthesis steps. This prevents the formation and accumulation of harmful enantiomers throughout the production chain, eliminating side effects while maintaining production efficiency.
Solution Approach 2:
The method extracts the harmful enantiomer from the racemic mixture in the initial resolution step using the amino alcohol-boron-binol complex. By separating and removing the inactive or harmful enantiomer early in the process, the patent ensures that only the beneficial enantiomer is carried forward in the synthesis, thereby eliminating side effects while maintaining high production volume of the desired pharmaceutical product.
3Manufacturing precision
If protective groups are used on —OH or amine groups during chiral resolution, then resolution can be performed, but additional protection and deprotection steps are required
Solution Approach 1:
The amino alcohol-boron-binol complex exhibits self-service properties by providing built-in selectivity through its chiral structure. The complex naturally discriminates between enantiomers through diastereomeric salt formation without requiring external protective groups or additional reagents. The amino alcohol component of the complex itself provides the chiral environment needed for resolution, making the system self-sufficient and eliminating the need for separate protection/deprotection steps.
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 method enables the preparation of optically active amino alcohol derivatives with high optical purity and yield, addressing the limitations of existing techniques and providing a more effective approach for producing pharmaceutically active single enantiomers.
Implementation Method 1
adding a racemic compound represented by the following Chemical Formula (1) with a boron compound and (R)- or (S)-binol to form an amino alcohol-boron-binol complex as a precipitate
Implementation Method 2
form an amino alcohol-boron-binol complex as a precipitate
Implementation Method 3
hydrolyzing the precipitate of the first process to acquire an optically active amino alcohol derivative
Data Source
AI summary
Disclosed are an amino alcohol-boron-binol complex as an intermediate, including Complex 3-1-1 shown below, and a method for preparing an optically active amino alcohol by using the same, wherein a racemic amino alcohol is resolved in an enationselective manner using a boron compound and a (R)- or (S)-binol, whereby an amino alcohol derivative with high optical purity can be prepared at high yield.