Enantioselective Hydrogenation of Chromenes Using Ir Catalyst
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Solution Overview
Problem
Current methods for synthesizing enantioselective equol and related chromanes are limited in terms of production rate and suitability for commercial quantities, lacking a cost-effective approach.
Innovation Solution
The method involves enantioselective hydrogenation of non-functionalized cyclic olefins, specifically chromenes, using an Ir catalyst with a chiral ligand to produce high-purity enantiomeric equol and chromanes, including the steps of providing a chromene compound, hydrogenating it in the presence of the catalyst, and optionally protecting and deprotecting hydroxyl groups to achieve the desired enantiomeric equol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chiral chromatographic resolution is used to isolate enantiomeric equol from racemic mixture, then enantiomeric purity is improved, but production rate and cost-effectiveness deteriorate
Solution Approach 1:
Instead of starting with racemic mixture and separating enantiomers through chromatographic resolution (the conventional approach), the invention inverts the approach by directly synthesizing the desired enantiomer through enantioselective hydrogenation. This eliminates the need for separation processes and achieves both high enantiomeric purity and efficient production rate simultaneously.
Solution Approach 2:
The invention changes the fundamental parameter of the synthesis approach from racemic synthesis followed by resolution to enantioselective synthesis. By using chiral catalysts (such as chiral organometallic complexes or enzymes) that preferentially catalyze the formation of one enantiomer, the process achieves high enantiomeric purity directly in the synthesis step, thereby improving both productivity and manufacturing precision.
2Manufacturing precision
If chiral chromatographic resolution is used to isolate enantiomeric equol from racemic mixture, then enantiomeric purity is improved, but manufacturing cost deteriorates
Solution Approach 1:
The invention inverts the conventional workflow by eliminating the costly chromatographic resolution step. Instead of separating enantiomers after synthesis, the method directly produces the desired enantiomer through enantioselective hydrogenation, thereby reducing manufacturing costs while maintaining high enantiomeric purity.
Solution Approach 2:
The invention changes the synthesis parameter from non-enantioselective to enantioselective hydrogenation. By using chiral catalysts that provide high enantiomeric excess directly during synthesis, the process eliminates the need for expensive resolution procedures, thereby improving ease of manufacture and reducing costs while achieving high 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
This approach enables the synthesis of enantioselective equol with high enantiomeric excess, up to 99.5%, suitable for commercial quantities, improving the efficiency and cost-effectiveness of equol production.
Implementation Method 1
hydrogenating the chromene in the presence of an Ir catalyst having a chiral ligand
Implementation Method 2
Ir catalyst having a chiral ligand shown as compound (V)
Data Source
AI summary
A method for preparing an enantiomeric chromane, by asymmetrically hydrogenating a chromene compound in the presence of an Ir catalyst having a chiral ligand. The method includes the enantioselective preparation of enantiomeric equol. A preferred Ir catalyst has a chiral phosphineoxazoline ligand. Enantiomeric chromanes of high stereoselective purity can be obtained.