Steroidal Piperidone Synthesis for Sucking Pest Control
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Solution Overview
Problem
Current pesticides are ineffective against sucking pests like aphids, whiteflies, and rice planthoppers due to resistance development, necessitating the development of novel insecticides with new chemical structures.
Innovation Solution
The synthesis of steroidal piperidone derivatives with specific chemical structures, which are synthesized through a high-yield method using dehydroepiandrosterone as a raw material, exhibiting prominent toxic activity against these pests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pesticides are used against sucking pests, then initial pest control effectiveness is achieved, but pest resistance develops over time making the pesticides ineffective
Solution Approach 1:
The patent changes the chemical structure parameters of pesticides by introducing steroidal piperidone derivatives with specific molecular configurations (general formulas I and II). These structural modifications create novel compounds that pests have not been exposed to, thereby overcoming resistance developed to conventional pesticides and restoring control effectiveness.
2Reliability
If novel steroidal piperidone derivatives are synthesized, then new insecticidal activity is achieved, but synthesis complexity increases
Solution Approach 1:
The synthesis process is segmented into distinct modular steps: Step 1 (acetylation of dehydroepiandrosterone), Step 2 (formation of piperidone ring), and Step 3 (introduction of substituent groups). Each step uses specific reagents and conditions that can be independently optimized, making the overall complex synthesis manageable and scalable.
Solution Approach 2:
The patent performs preliminary actions by first acetylating dehydroepiandrosterone to create a protected intermediate, then systematically building the piperidone ring structure before introducing diverse substituent groups. This sequential preliminary construction simplifies the overall synthesis by preparing the molecular framework in advance.
3Productivity
If high-yield synthesis method is implemented, then production efficiency is improved, but separation and purification difficulty may increase
Solution Approach 1:
The patent achieves local quality optimization by incorporating specific functional groups (carbonyl, hydroxyl, and various substituent groups like halogen, trifluoromethyl, nitro, and methoxy) at specific positions on the steroidal framework. These localized structural features create differences in polarity and solubility that facilitate separation and purification while maintaining high synthesis yields.
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 steroidal piperidone derivatives demonstrate significant insecticidal activity against aphids, whiteflies, rice planthoppers, and spider mites, offering a novel solution for pest control with high yield and ease of separation in the synthesis process.
Implementation Method 1
adding 4-dimethylaminopyridine, triethylamine (TEA), and an acyl chloride with various substituents successively to dichloromethane (DCM) in which a compound (3) or (5) is dissolved, and conducting a reaction at room temperature for 6 h
Implementation Method 2
with methanol as a solvent, adding sodium carbonate, and conducting a reaction under reflux for 2 h
Implementation Method 3
with ethanol as a solvent, adding a compound (8), hydroxylamine hydrochloride, and sodium acetate, and conducting a reaction at room temperature for 0.5 h
Implementation Method 4
with tetrahydrofuran (THF) as a solvent, adding thionyl chloride, and conducting a reaction at room temperature for 1 h
Implementation Method 5
with ethanol as a solvent and Pb/C as a catalyst, introducing hydrogen, and conducting a reaction at room temperature for 60 h
Data Source
AI summary
A steroidal piperidone derivative, a synthesis method, and a use thereof are provided. The steroidal piperidone derivative has a chemical structure shown in general formula (1) or general formula (2), where R is any one selected from the group consisting of alkyl, phenyl, substituted phenyl, and a heterocycle. In the synthesis method of the steroidal piperidone derivative, dehydroepiandrosterone (DHEA) is used as a basic raw material to prepare the steroidal piperidone derivative of the present disclosure through a series of reactions. A product prepared by the synthesis method has a high yield and is easily separated, and thus the synthesis method is the optimal method for preparing the steroidal piperidone derivative of the present disclosure. The present steroidal piperidone derivative exhibits prominent toxic activity against sucking pests, such as aphids, spider mites, rice planthoppers, and B. tabaci, and can be used for the control of a plant pest.