Halogen-Substituted Prodrugs for Prolonged Arthropodicidal Activity
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Solution Overview
Problem
Current halogenated carboxamides and ectoparasiticides have limited systemic activity, short duration of effect, low solubility, and bioavailability, making them unsuitable for prolonged broad arthropodicidal activity, particularly in veterinary applications.
Innovation Solution
Development of novel halogen-substituted compounds with enhanced solubility and bioavailability, designed as prodrugs with specific linker groups and spacer moieties to improve stability and systemic release, allowing for extended ectoparasiticidal activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If halogenated carboxamides are used for ectoparasiticidal treatment, then insecticidal activity is achieved, but the duration of effect is limited to less than three months
Solution Approach 1:
The patent applies the prodrug concept where the active halogenated carboxamide is pre-modified with a pro-moiety (carbamate or carbonate ester linker) before administration. This preliminary modification enables the compound to be stored and administered in a stable form that will release the active principle over an extended period (3-6 months), thereby achieving prolonged duration of action while maintaining reliable arthropodicidal activity
Solution Approach 2:
The patent introduces a pro-moiety as an intermediary between the active drug molecule and the biological system. This intermediary group (carbamate or carbonate ester linker) facilitates extended circulation and controlled release of the active halogenated carboxamide, acting as a mediator that transforms the short-acting parent compound into a long-acting prodrug formulation
2Reliability
If ectoparasiticides are administered systemically, then broad arthropodicidal activity is achieved, but solubility is insufficient for effective administration
Solution Approach 1:
The patent modifies the physicochemical parameters of the halogenated carboxamide by attaching a pro-moiety with specific solubility-enhancing characteristics. The carbamate or carbonate ester linker contains polar groups and hydrogen bonding capabilities that increase aqueous solubility without compromising the lipophilic aromatic core responsible for arthropodicidal activity, thereby achieving both broad spectrum efficacy and improved administerability
3Ease of operation
If prodrug linkers are attached to improve solubility, then aqueous solubility increases, but stability in formulation may be reduced
Solution Approach 1:
The patent employs bioreversible linkers (carbamate or carbonate ester) that are designed to be stable during formulation storage and administration but readily cleaved in vivo by ubiquitous esterases and amidases. This approach accepts controlled degradation as a feature rather than a bug, allowing the prodrug to function as a temporary carrier that delivers the active drug before being metabolically dismantled, thus achieving both solubility enhancement and acceptable formulation stability
Data Source
AI summary
The present invention relates to novel halogen-substituted compounds, to processes for their preparation and to their use for controlling animal pests, in particular arthropods and especially insects and arachnids.