Tomato Leafminer Pheromone Synthesis via Copper-Catalyzed Magnesian Coupling
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Solution Overview
Problem
The development of pheromone-based control solutions for pests like the tomato leafminer (Tuta absoluta) is hindered by the high cost and complexity of synthesizing isomerically pure pheromone molecules, which often require expensive selective synthesis technologies and result in low yields due to the presence of many positional and configurational isomers, some of which have antagonistic functions.
Innovation Solution
A method involving magnesian coupling in the presence of a copper(II) complex catalyst, which selectively substitutes the acetate function in the allylic position while preserving the homoallylic acetate function, reducing the number of reaction steps and avoiding the need for protection and deprotection reactions, thereby enhancing yield and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If selective synthesis technologies are used to produce isomerically pure pheromone molecules, then the purity of the product is improved, but the manufacturing cost increases significantly
Solution Approach 1:
The invention changes the chemical parameters of the synthesis route by using a copper(II) catalyst system that enables selective allylic substitution. This parameter change allows the reaction to proceed with high isomeric purity (97%) while avoiding the need for expensive protective group chemistry, thereby reducing manufacturing cost
Solution Approach 2:
The invention segments the synthesis into a direct one-step coupling reaction between the Grignard reagent and the homoallylic acetate, eliminating the need for separate protection and deprotection steps. This segmentation of the synthetic pathway reduces both time and cost while maintaining high purity
2Manufacturing precision
If multiple protection and deprotection steps are included in the synthesis route, then the selectivity of the reaction is improved, but the number of manufacturing steps and time required increases
Solution Approach 1:
The invention uses preliminary action by designing the homoallylic acetate substrate with inherent selectivity features that guide the Grignard reagent to the correct position. The copper(II) catalyst pre-organizes the reaction pathway to achieve selective allylic substitution without requiring subsequent protective group manipulations
Solution Approach 2:
The invention extracts the need for protection-deprotection steps entirely from the synthesis route. By using the copper-catalyzed direct substitution method, the reactive acetate group is selectively transformed in one step, removing the time-consuming protective group chemistry from the process
3Manufacturing precision
If conventional synthesis routes with protection-deprotection steps are used, then the selectivity is improved, but the overall yield decreases due to multiple reaction steps
Solution Approach 1:
The invention merges the substitution reaction into a single catalytic step using copper(II), combining what would traditionally require separate protection, substitution, and deprotection steps into one operation. This merging achieves both high position selectivity (97% purity) and high overall yield (87%)
4Manufacturing precision
If dilute conditions are used to achieve selective coupling, then the selectivity of the reaction is improved, but the fixed costs and variable costs increase
Solution Approach 1:
The invention changes the concentration parameter from dilute to concentrated conditions while maintaining high selectivity through the copper(II) catalyst. This parameter change allows for more efficient use of reagents and reduced costs, as concentrated reactions require smaller reaction volumes and generate less waste
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 achieves a high yield (87%) and purity (97%) of the target pheromone molecules with reduced impurities, specifically minimizing harmful impurities that can have anti-synergistic roles, leading to more effective pheromone production for insect control.
Implementation Method 1
A method involving magnesian coupling in the presence of a copper(II) complex catalyst, which selectively substitutes the acetate function in the allylic position
Data Source
AI summary
The present invention relates to a method for synthesising a pheromone of general formula selected from the group comprising compounds (I) and (I′), alone or in admixture: (I) (I′) comprising reacting (2E)-pentene-1,5-diyl diacetate with at least one Grignard reagent in the presence of a copper-based catalyst. The method according to the invention is particularly applicable to the selective synthesis of tomato leafminer (Tuta absolute) pheromone comprising: (3E,8Z,11Z)-tetradecatrien-1-yl acetate and (3E,8Z)-tetradecadien-1-yl acetate.