Triazole Synthesis via Segmented Reaction Steps
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Solution Overview
Problem
Current methods for producing triazole compounds with pest control efficacies are inefficient and lack effective intermediates for synthesizing compounds with desired properties.
Innovation Solution
A method involving the production of compound (5) by adding compound (4) and phosphorus oxychloride to compound (3), followed by intramolecular condensation in the presence of an acid to obtain compound (6), utilizing specific solvents, bases, and reaction conditions to achieve optimal yields and pest control efficacies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce triazole compounds, then the production process is simpler, but the yield and pest control efficacy are insufficient
Solution Approach 1:
The production process is divided into multiple sequential steps: Step 1 (reaction of compound 1 with 1H-1,2,4-triazole), Step 2 (addition of compound 4 and phosphorus oxychloride to compound 3), and Step 3 (intramolecular condensation). This segmentation allows optimization of each step independently, achieving high overall yield while maintaining manageable process complexity through systematic breakdown of the synthesis pathway.
Solution Approach 2:
Compound 3 is prepared in advance through the reaction of compound 1 with 1H-1,2,4-triazole before being used in the main synthesis. This preliminary preparation of the intermediate compound enables the subsequent high-yield production of compound 6, as the pre-formed compound 3 is ready for immediate use in the condensation reaction without additional purification steps.
2Reliability
If conventional production methods are used, then the process is easier to operate, but the pest control efficacy is insufficient
Solution Approach 1:
The method specifies precise reaction parameters including temperature ranges (0-50°C for Step 1, -78°C to 25°C for Step 2, 0-50°C for Step 3), stoichiometric ratios (1.0-2.0 equivalents of compound 4, 0.5-2.0 equivalents of phosphorus oxychloride), and solvent types. These controlled parameter changes ensure high pest control efficacy of compound 6 while maintaining operational ease through well-defined procedural steps.
Solution Approach 2:
Compound 3 serves as a critical intermediary in the synthesis pathway, formed from compound 1 and 1H-1,2,4-triazole, and then used to produce compound 6. This intermediary compound enables the transformation from simple starting materials to the high-efficacy final product through controlled chemical transformations, ensuring both reliability and operational feasibility.
3Productivity
If high-yield production is achieved through multiple steps, then the yield improves, but the production time increases
Solution Approach 1:
The synthesis proceeds through continuous sequential reactions where each step flows into the next without interruption. Compound 1 reacts with 1H-1,2,4-triazole to form compound 3, which then immediately undergoes the condensation reaction with compound 4 and phosphorus oxychloride to produce compound 6. This continuous action minimizes idle time between steps while achieving high yield through optimized reaction conditions.
Solution Approach 2:
Compound 3 is prepared in advance through the first reaction step before being used in the main synthesis. This preliminary preparation enables the subsequent high-yield production to proceed efficiently without time loss for intermediate purification or setup, as the intermediate is ready for immediate use in the condensation reaction.
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 method provides a high-yield production of compound (6) with excellent pest control efficacies, utilizing compound (5) as an intermediate, which can be further purified and used to enhance the synthesis process, resulting in effective pest control compounds.
Implementation Method 1
adding compound (4) and phosphorus oxychloride simultaneously and separately to compound (3) to produce compound (5)
Implementation Method 2
subjecting compound (5) to intramolecular condensation in the presence of an acid to produce compound (6)
Implementation Method 3
reacting compound (1) with 1H-1,2,4-triazole in the presence of an inorganic base to obtain a reaction mixture, and then mixing the reaction mixture with an acid
Data Source
Figure 1
AI summary
A compound represented by formula (5) can be produced by Step (A): adding a compound represented by formula (4) and phosphorus oxychloride simultaneously and separately to a compound represented by formula (3) , and a compound represented by formula (6): having excellent control efficacies against pests can be produced by intramolecular condensation of the compound represented by formula (5) in the presence of an acid.