Synthesizing 7-methyl-3-methylene-7-octenyl propionate via Segmentation
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Solution Overview
Problem
Current methods for synthesizing 7-methyl-3-methylene-7-octenyl propionate, a major component of the San Jose Scale sex pheromone, face challenges such as the use of expensive and difficult-to-handle reagents, low yields, and the formation of undesired isomers, making it difficult to produce on an industrial scale.
Innovation Solution
A method involving a coupling reaction between a nucleophile and an electrophile with 5 carbon atoms, using easily accessible reagents, to selectively synthesize 7-methyl-3-methylene-7-octenyl halide, which is then converted into 7-methyl-3-methylene-7-octenyl propionate, utilizing a SN2 reaction and optimizing reaction conditions to achieve high selectivity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing synthesis methods (a-f) are used to produce 7-methyl-3-methylene-7-octenyl propionate, then the target compound can be synthesized, but the process becomes complex and difficult to implement on an industrial scale due to expensive reagents, low yields, and formation of undesired isomers
Solution Approach 1:
The synthesis is divided into two independent stages: (1) coupling reaction to form 7-methyl-3-methylene-7-octenyl halide with high selectivity, and (2) nucleophilic substitution to convert the halide to the final propionate product. This segmentation allows each stage to be optimized independently, improving overall manufacturing precision while simplifying industrial implementation.
Solution Approach 2:
7-methyl-3-methylene-7-octenyl halide is introduced as a stable intermediate compound that can be isolated and purified between the coupling reaction and the final substitution reaction. This intermediary step prevents isomer formation and allows for quality control, resolving the contradiction between selectivity and process complexity.
2Productivity
If existing synthesis methods are used, then the target compound can be produced, but the yield is low and expensive reagents are required, making economical production difficult
Solution Approach 1:
The invention changes the reaction parameters by using a coupling reaction followed by nucleophilic substitution instead of the traditional multi-step organic synthesis. This parameter change achieves quantitative yields (>90%) and eliminates the need for expensive reagents like organolithium compounds and lithium aluminum hydride, directly resolving the contradiction between productivity and reagent quantity.
Solution Approach 2:
The invention replaces expensive, sensitive reagents with inexpensive, stable alternatives. The coupling reaction uses readily available starting materials, and the substitution reaction uses simple nucleophiles like propionate salts, eliminating the need for costly organometallic reagents and making economical production feasible.
3Manufacturing precision
If existing synthesis methods are used, then the target compound can be synthesized, but undesired isomers are formed as by-products requiring additional purification steps
Solution Approach 1:
The coupling reaction conditions are specifically designed to prevent isomer formation from the outset by controlling the reaction mechanism. The subsequent nucleophilic substitution occurs under conditions that maintain the integrity of the double bond structure, preventing isomerization. This preliminary anti-action eliminates the need for time-consuming purification steps while ensuring high product purity.
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 approach allows for the efficient and selective production of 7-methyl-3-methylene-7-octenyl propionate, overcoming the limitations of existing methods by using readily available reagents and minimizing by-product formation, thus enabling the production of sufficient quantities for biological and agronomic studies and practical applications.
Implementation Method 1
a coupling reaction of a nucleophile (1) with an electrophile (2)
Implementation Method 2
utilizing a SN2 reaction and optimizing reaction conditions to achieve high selectivity and efficiency
Data Source
AI summary
Provided is a simple, selective and efficient method for producing 7-methyl-3-methylene-7-octenyl propionate and the like. More specifically, provided is, for example, a method for producing 7-methyl-3-methylene-7-octenyl propionate, comprising the steps of: subjecting a nucleophile represented by Formula (1) and an electrophile represented by Formula (2) to a coupling reaction to obtain a 7-methyl-3-methylene-7-octenyl halide represented by Formula (3), and subjecting the 7-methyl-3-methylene-7-octenyl halide (3) to propionyloxylation to obtain the 7-methyl-3-methylene-7-octenyl propionate represented by Formula (4).