Optically Active Biphenol Derivative Production via Diamine Resolution
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Solution Overview
Problem
Current methods for producing optically active 2,2'-biphenol derivatives are complex and inefficient, with low reaction yields and multistage synthesis routes, which hinder their application in pharmaceutical and agrichemical production.
Innovation Solution
A method involving the reaction of an optically active diamine with a 6,6'-disubstituted-5,5'-dihalogeno-3,3'-disubstituted-2,2'-biphenol derivative to form a salt, followed by neutralization and treatment with Lewis or Brønsted acids, efficiently producing optically active 6,6'-disubstituted-2,2'-biphenol derivatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (oxidative ortho-coupling, meso form conversion, or optical resolution) are used to produce optically active 2,2'-biphenol derivatives, then the compounds can be synthesized, but the procedures become complex with multiple stages and low reaction yields
Solution Approach 1:
The patent applies preliminary action by pre-forming the racemic 6,6'-disubstituted-5,5'-dihalogeno-3,3'-disubstituted-2,2'-biphenol derivative through oxidative ortho-coupling before performing optical resolution. This allows the complex optical resolution step to be performed on a pre-prepared racemic mixture, simplifying the overall process by separating the synthesis and resolution operations into distinct, manageable stages.
Solution Approach 2:
The patent uses an optically active diamine compound as an intermediary to achieve optical resolution. The diamine forms a diastereomeric salt with the racemic biphenol derivative, allowing selective crystallization and separation of enantiomers. This intermediary approach enables optical resolution without requiring complex chiral catalysts or reagents, simplifying the process while maintaining high optical purity.
2Reliability
If conventional methods are used to produce optically active 2,2'-biphenol derivatives, then the compounds can be synthesized, but the reaction yields are low
Solution Approach 1:
The patent applies the extraction principle by selectively extracting one enantiomer from the racemic mixture through formation of diastereomeric salts with an optically active diamine. The desired enantiomer is extracted into the crystalline salt form, while the other enantiomer remains in the mother liquor, enabling high yield recovery of the optically active compound.
Solution Approach 2:
The patent utilizes parameter changes by altering the physical and chemical properties of the biphenol derivative through formation of diastereomeric salts. The salt formation changes the solubility and crystallization parameters, allowing selective precipitation of the desired enantiomer. This parameter change enables high yield separation that conventional direct synthesis methods cannot achieve.
3Reliability
If multistage synthesis routes are used to produce optically active 2,2'-biphenol derivatives, then the optical purity can be improved, but the production efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-preparing the racemic 6,6'-disubstituted-5,5'-dihalogeno-3,3'-disubstituted-2,2'-biphenol derivative through a single oxidative ortho-coupling step before performing optical resolution. This preliminary synthesis step eliminates the need for multiple sequential synthesis stages, reducing production time while maintaining the ability to achieve high optical purity through the resolution 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 allows for the simple and efficient production of optically active 2,2'-biphenol derivatives with high optical purity, suitable for use in pharmaceutical and agrichemical bulk drug production.
Implementation Method 1
allowing an optically active diamine compound to act on an optical isomer mixture of a 6,6'-disubstituted-5,5'-dihalogeno-3,3'-disubstituted-2,2'-biphenol derivative to obtain a salt of one optical isomer
Implementation Method 2
followed by neutralization and treatment with Lewis or Brønsted acids, efficiently producing optically active 6,6'-disubstituted-2,2'-biphenol derivatives
Implementation Method 3
reacting a 5-substituted-4-halogeno-2-substituted-phenol derivative with a copper salt and an organic base or cupric oxyhalide organic base complex
Data Source
AI summary
An optically active 2,2'-biphenol derivative and a production method that enables simple and efficient production of this compound. More specifically, an optically active biphenol derivative represented by the following formulas (1) and (2), a method for optically resolving a biphenol derivative represented by formula (2'), a production method of an optically active biphenol derivative (1) comprising a step for reacting a Brønsted acid with a biphenol derivative (2), and a production method of an optically active biphenol derivative (3) comprising a step for reacting a Lewis acid with an optically active biphenol derivative (1) or an optically active biphenol derivative (2). In the following formulas, R1 represents, for example, a primary or secondary alkyl group having 1 to 10 carbon atoms, * represents an axially asymmetric center, X represents a halogen atom, and R2 represents a tertiary alkyl group having 4 to 6 carbon atoms.