One-Pot Indanone Synthesis via Condensation and Cyclization
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Solution Overview
Problem
The existing synthetic pathways for indanones are complex and costly, requiring multiple steps, which increases the production costs of these compounds used in fragrances and other applications.
Innovation Solution
A novel one-pot process involving the condensation of an amino compound with an α-substituted cinnamic aldehyde, followed by cyclization, isomerization, and hydrolysis, using Lewis acids and Bronsted acids as catalysts, to efficiently produce indanones with reduced solvent consumption and fewer purification steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional multi-step synthesis pathways are used for indanones, then the reaction can be performed with conventional reagents and conditions, but the process complexity increases and production costs increase
Solution Approach 1:
The patent combines multiple sequential reactions (condensation, cyclization, isomerization, and hydrolysis) into a single one-pot reaction system. The amino compound reacts with α-substituted cinnamic aldehyde to form an intermediate, which then undergoes cyclization, isomerization, and hydrolysis in the same reaction vessel without isolation of intermediates, thereby simplifying the manufacturing process and reducing the number of operational steps.
Solution Approach 2:
The reaction conditions are designed so that the condensation reaction occurs first, followed by spontaneous or catalyzed cyclization and isomerization before final hydrolysis. This preliminary sequencing of reactions within a single pot eliminates the need for separate purification and handling steps between reactions, reducing process complexity.
2Productivity
If traditional multi-step synthesis pathways are used for indanones, then each step can be optimized independently, but the total production time increases and productivity decreases
Solution Approach 1:
The one-pot reaction system maintains continuous chemical transformation throughout the reaction period. The condensation, cyclization, isomerization, and hydrolysis reactions proceed sequentially without interruption or isolation of intermediates, maximizing the utilization of reaction time and eliminating downtime associated with work-up and purification steps between traditional multi-step syntheses.
3Speed
If sulfonamides are used as amino compounds in the condensation reaction, then the reaction proceeds fast, but the reagent cost increases
Solution Approach 1:
The patent explores different amino compounds (sulfonamides, carbamates, and alkylamides) with varying reactivity and cost profiles. By adjusting the choice of amino compound and optimizing reaction conditions such as catalyst selection and temperature, the process achieves acceptable reaction rates with cost-effective reagents, balancing speed and economic considerations.
4Loss of substance
If a one-pot process is used, then the number of purification steps is reduced and solvent consumption decreases, but the reaction conditions must be carefully controlled to avoid by-products
Solution Approach 1:
The use of specific catalysts (Lewis acids such as FeCl3, AlCl3, or Bronsted acids) acts as an intermediary to control the reaction pathway and intermediate stability. These catalysts facilitate the sequential transformations while minimizing side reactions, ensuring high selectivity for the desired indanone product despite the complexity of performing multiple reactions in one pot.
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 process simplifies the synthesis of indanones, reduces costs, and potentially increases yield, making the production more environmentally friendly and economically viable while providing convenient handling of intermediates and final products.
Implementation Method 1
a) condensation of an amino compound H2NR with a compound of formula (II) followed by cyclization to a compound of formula (III)
Implementation Method 2
b) isomerization of compound of formula (III) to a compound of formula (IV)
Implementation Method 3
c) hydrolysis of compound of formula (IV) to compound of formula (I)
Implementation Method 4
using Lewis acids and Bronsted acids as catalysts
Data Source
AI summary
A process of forming compounds of formula (I) comprising the steps of addition of an amino compound H2NR to a compound of formula (II) followed by cyclization, isomerization and hydrolysis.