(R)-3-Hydroxybutyl (R)-3-hydroxybutyrate Production via Transesterification
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Solution Overview
Problem
Current methods for producing (R)-3-hydroxybutyl (R)-3-hydroxybutyrate are complex, costly, and inefficient, with low yields and impracticality on a large scale, often resulting in impure products and high production costs.
Innovation Solution
A process involving the transesterification of poly-(R)-3-hydroxybutyrate with an alcohol to produce an ester, followed by separation and reduction to form (R)-1,3-butanediol, which is then reacted with the ester to produce enantiomerically enriched (R)-3-hydroxybutyl (R)-3-hydroxybutyrate, utilizing a cost-effective and commercially available starting material from corn starch fermentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If poly-(R)-3-hydroxybutyrate is transesterified with an alcohol to produce an ester, then the starting material is converted to a reducible intermediate, but the process requires multiple steps and complex separation
Solution Approach 1:
The process divides the poly-(R)-3-hydroxybutyrate feedstock into two separate streams: one stream undergoes transesterification to produce esters for the final condensation reaction, while the other stream is reduced to produce (R)-1,3-butanediol. This segmentation allows each stream to be optimized independently, simplifying the overall process design and equipment requirements while maintaining ease of manufacture from the low-cost starting material.
2Productivity
If existing synthetic methods are used to produce (R)-3-hydroxybutyl (R)-3-hydroxybutyrate, then the product can be obtained, but the methods involve low yields and high production costs
Solution Approach 1:
The invention uses poly-(R)-3-hydroxybutyrate as the starting material, which already possesses the desired (R) stereochemistry throughout the polymer chain. By maintaining this homogeneity of stereochemistry through the transesterification and condensation steps, the process achieves high yields of enantiomerically pure product without requiring costly chiral resolution or multiple purification steps, thereby reducing production costs while improving productivity.
3Manufacturing precision
If enantioselective reduction is performed on compounds of formula I, II or III, then (R)-3-hydroxybutyl (R)-3-hydroxybutyrate can be produced, but the starting materials are costly and reaction rates are limited
Solution Approach 1:
The invention performs preliminary action by first transesterifying the poly-(R)-3-hydroxybutyrate to produce esters with the correct (R) stereochemistry already established in the starting material. This preliminary establishment of stereochemistry eliminates the need for slow enantioselective reduction steps, thereby maintaining high enantiomeric purity while significantly improving reaction rates and overall productivity. The starting material's inherent stereochemistry is preserved throughout the process.
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 high-throughput industrial production of enantiomerically enriched (R)-3-hydroxybutyl (R)-3-hydroxybutyrate with high purity, improving the economics and scalability of production while maintaining stereochemistry, suitable for use as a food or nutritional supplement.
Implementation Method 1
contacting poly-(R)-3-hydroxybutyrate with an alcohol to transesterify the poly-(R)-3-hydroxybutyrate under transesterification conditions to produce an ester of (R)-3-hydroxybutyrate and the alcohol
Implementation Method 2
reducing the first portion of the (R)-3-hydroxybutyrate ester to form (R)-1,3-butanediol
Implementation Method 3
contacting under transesterification conditions the (R)-1,3-butanediol from step ii) with the second portion of the transesterified ester to produce (R)-3-hydroxybutyl (R)-3-hydroxybutyrate
Data Source
AI summary
Embodiments of the present invention are directed to processes for the production of (R)-3-hydroxybutyl (R)-3-hydroxybyrate. Poly (R)-3-hydroxybyrate is transesterified with an alcohol, to form a first ester portion and a second ester portion. The first ester portion is reduced to the diol to form a diol portion and the diol portion is reacted with the second ester portion to produce (R)-3-hydroxybutyl (R)-3-hydroxybyrate.