Pyrazole Antioxidant Stabilizing Aqueous Radical Scavenging
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Solution Overview
Problem
Edaravone, a potent radical scavenger, is unstable in aqueous solutions and easily oxidized, necessitating storage in reducing conditions, limiting its clinical use as a reactive oxygen species eliminator.
Innovation Solution
A new antioxidant compound represented by formula (1) or its salt, featuring a pyrazole or pyrazoline ring with specific substituents and a saturated or unsaturated hydrocarbon group, which forms a conjugated system to stabilize and effectively scavenge reactive oxygen species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If edaravone is used as a reactive oxygen species eliminator, then radical scavenging ability is improved, but stability in aqueous solution deteriorates
Solution Approach 1:
The patent applies composite material design by combining a pyrazole or pyrazoline ring core with specific substituent groups (hydroxy, alkyl, aryl, etc.) to create a molecular composite structure. This composite structure integrates the radical scavenging functionality of the pyrazole ring with stabilizing substituents, achieving both high radical scavenging ability and improved aqueous solution stability. The compound of formula (1) represents this composite molecular structure that resolves the contradiction between reactivity and stability.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical structure parameters of the antioxidant molecule. Specifically, it changes the substituent parameters on the pyrazole ring (different R groups, L linkers, A and B ring configurations) to optimize both radical scavenging activity and aqueous stability. This structural parameter optimization allows the compound to maintain potent radical scavenging while achieving enhanced stability in aqueous solutions without requiring reducing conditions.
2Ease of operation
If edaravone is stored in aqueous solution, then ease of operation is improved, but storage stability deteriorates
Solution Approach 1:
The compound of formula (1) uses composite molecular design with stabilizing substituent groups that enable the molecule to maintain stability in aqueous environments during storage. The specific combination of pyrazole ring, substituents (R1-R6), and linker (L) creates a composite structure resistant to oxidation and degradation in aqueous solutions, allowing long-term storage without special reducing conditions.
Solution Approach 2:
The patent changes the chemical parameters of the antioxidant structure to improve storage stability in aqueous solutions. By optimizing substituents and molecular configuration, the compound achieves parameter values that confer both water compatibility and oxidation resistance, enabling stable storage in aqueous form without requiring reducing agents or special atmospheric conditions.
3Productivity
If many reactive oxygen species eliminators are developed, then productivity is improved, but stability deteriorates
Solution Approach 1:
The patent applies composite material principles by designing a novel molecular composite with specific structural features (pyrazole ring with defined substituents and linkers) that inherently provides both antioxidant activity and stability. This composite structure distinguishes the invention from other eliminators that lack such integrated design, achieving superior stability while maintaining effectiveness.
Solution Approach 2:
The patent implements parameter changes by establishing specific structural parameters for the compound of formula (1), including the pyrazole ring configuration, substituent types (R1-R6), and linker characteristics (L). These parameter specifications create a compound with optimized balance between antioxidant potency and stability, differentiating it from other eliminators that have not optimized these molecular parameters.
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
The compound maintains stability in aqueous solutions, effectively scavenges reactive oxygen species, including singlet oxygen and superoxide, with low cytotoxicity and prolonged storage stability, enhancing its clinical applicability.
Implementation Method 1
edaravone is an antioxidant that functions to scavenge radicals generated at the time of restarting blood flow after an acute cerebral ischemic attack or cerebral infarction, in particular singlet oxygen
Data Source
AI summary
The present invention provides a new antioxidant. An antioxidant of the present invention includes:a compound represented by the following formula (1) or a salt thereof:where in the formula (1),an A ring and a B ring may be the same or different and are a pyrazole ring having a substituent or a pyrazoline ring having a substituent, andL is a saturated or unsaturated hydrocarbon group.