Anthranilic Diamide Synthesis via Single-Step Oxidation-Halogenation
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Solution Overview
Problem
Existing processes for preparing anthranilic diamides are laborious and lack sufficient selectivity, necessitating a simpler, more efficient, and industrially economical method.
Innovation Solution
A novel process involving the conversion of isatins into isatoic anhydrides through a single-step oxidation and halogenation reaction, followed by reactions with amines to produce anthranilic diamides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multi-step processes are used for preparing anthranilic diamides, then the process can be performed with existing methods, but the process becomes laborious and lacks sufficient selectivity
Solution Approach 1:
The patent combines oxidation and halogenation reactions into a single integrated step using sodium hypochlorite as a reagent that performs both functions simultaneously. This merging of two separate process steps into one reduces overall process complexity while maintaining high selectivity for the desired anthranilic diamide products.
Solution Approach 2:
Sodium hypochlorite serves multiple functions in the reaction process: it acts as both an oxidizing agent and a halogenating agent. This multi-functionality eliminates the need for separate reagents and steps for oxidation and halogenation, thereby simplifying the overall process while achieving high selectivity.
2Productivity
If conventional processes are used for preparing anthranilic diamides, then existing methods can be applied, but the process becomes laborious and time-consuming
Solution Approach 1:
By merging oxidation and halogenation into a single reaction step using sodium hypochlorite, the patent reduces the total number of process steps required. This integration directly improves productivity by eliminating intermediate isolation and purification steps while reducing the overall time required to complete the synthesis.
Solution Approach 2:
The use of sodium hypochlorite performs both oxidation and halogenation in advance during a single reaction step, rather than requiring sequential treatment. This preliminary combined action reduces the total process time and eliminates the need for multiple separate operation cycles.
3Ease of manufacture
If conventional multi-step processes are used, then existing reagents and methods can be employed, but the process lacks industrial economy
Solution Approach 1:
The patent merges oxidation and halogenation into one process step using sodium hypochlorite, which significantly reduces the number of unit operations required. This simplification directly improves industrial economy by reducing equipment requirements, lowering operational complexity, and enabling more economical large-scale production.
Solution Approach 2:
Sodium hypochlorite is a inexpensive, readily available reagent that can be used in high concentrations and disposed of easily after reaction. This choice of reagent improves industrial economy by using a cheap, short-lived chemical that simplifies waste handling and reduces overall process costs compared to more expensive, specialized reagents.
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 process provides an industrially amenable and convenient method for preparing anthranilic diamides with improved efficiency and selectivity.
Implementation Method 1
The conversion of the dione of Formula II into an isatoic anhydride of Formula V is novel and inventive as both the oxidation and the halogenation reactions are carried out in a single step
Implementation Method 2
both the oxidation and the halogenation reactions are carried out in a single step
Data Source
AI summary
The present invention relates a novel process for preparing a compound of Formula I,wherein, R1, R2, R3a, R3b, R3c, R4, R5, R6, R7 and Z are as defined in the description.The process comprises a novel and inventive step of converting a dione of Formula II into an isatoic anhydride of Formula V in a single step.wherein, R2 is F, Cl, Br or I; R1, R3a, R3b, R3c, R4, R5, R6, R7 and Z are as defined in the description.