L-glufosinate Intermediate Synthesis via Telescoped Protection
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Solution Overview
Problem
Existing methods for preparing L-glufosinate are lengthy, tedious, and result in low yields due to sensitive intermediates that undergo reversible reactions, leading to by-products and requiring multiple purification steps, which affects the purity of the final product.
Innovation Solution
A process involving the protection of amino and hydroxyl groups, followed by halogenation, is developed to efficiently synthesize the key intermediate compound of formula (I), which is then used to produce L-glufosinate or its salts, utilizing a biphasic solvent system and maintaining a pH range of 4 to 7 to minimize by-product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used for preparing compound of formula (I), then the process can be carried out with standard procedures, but the process becomes lengthy and tedious requiring multiple isolation steps
Solution Approach 1:
The patent combines multiple reaction steps into a one-pot telescoped sequence where compound of formula (II) undergoes protection, deprotection, and halogenation reactions in a single reaction vessel without isolating intermediates. This merging of operations eliminates time-consuming isolation and purification steps while maintaining product quality, directly resolving the contradiction between thorough processing and process duration.
2Manufacturing precision
If intermediates are isolated and purified through multiple steps, then purity can be maintained, but the overall yield is reduced due to reversible reactions and by-product formation
Solution Approach 1:
The patent applies preliminary protective group chemistry to mask sensitive functional groups (amino and hydroxyl groups) before subjecting the molecule to reactions that would otherwise cause reversible reactions or by-product formation. By pre-protecting these groups, the reaction pathway is directed toward the desired product with minimal side reactions, maintaining high purity while preserving material through the telescoped sequence.
Solution Approach 2:
Protective groups act as intermediaries that temporarily modify the chemical properties of sensitive functional groups during the reaction sequence. These intermediaries prevent unwanted interactions and reversible reactions, allowing the telescoped process to proceed to completion with high yield and purity, then are removed in a final deprotection step.
3Ease of operation
If the process uses sensitive intermediates that undergo reversible reactions, then the reaction can proceed under mild conditions, but by-products form and require multiple purification steps
Solution Approach 1:
The patent applies preliminary anti-action by introducing protective groups that prevent the sensitive intermediates from undergoing unwanted reversible reactions and by-product formation. The protective groups counteract the inherent instability of the intermediates, allowing the reaction to proceed cleanly under mild conditions without generating harmful by-products that would require extensive purification.
4Manufacturing precision
If multiple purification steps are implemented, then product purity is improved, but process complexity and cost increase
Solution Approach 1:
The patent extracts the purification requirement from the process by designing a telescoped reaction sequence with protective group chemistry that prevents by-product formation in the first place. Instead of requiring multiple extraction and purification steps, the process is designed to produce the desired compound directly with high purity, eliminating the need for complex purification equipment and operations.
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 process provides a shorter, more economical, and scalable route to high-purity L-glufosinate and its salts, reducing the complexity and increasing the yield by avoiding reversible reactions and by-product formation.
Implementation Method 1
protecting the amine group of compound of formula (II) or its salt to obtain compound of formula (III)
Implementation Method 2
deprotection of hydroxyl group
Implementation Method 3
halogenation
Implementation Method 4
utilizing a biphasic solvent system
Data Source
AI summary
The present invention provides a process for preparation of compound of formula (I), a key intermediate in synthesis of L-glufosinate or its salt. wherein P2 is an amino-protecting group; R1 is hydrogen, substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C1 to C6 alkenyl group, a substituted or unsubstituted C1 to C6 alkynyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C20 aryl group, or a substituted or unsubstituted C2 to C10 heteroaryl group; and X is a halogen or hydroxyl group.