N-Hydroxy-Acrylamide Synthesis via Acrylic Acid Chloride
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Solution Overview
Problem
Current methods for producing N-hydroxy-acrylamide derivatives of N-sulphonylpyrrole compounds are costly and inefficient, requiring expensive reagents like O-(tetrahydro-2H-pyran-2-yl)hydroxylamine and generating unwanted byproducts, necessitating additional purification steps.
Innovation Solution
A novel process involving the reaction of acrylic acid chloride with aqueous hydroxylamine to directly form N-hydroxy-acrylamide derivatives without byproducts, reducing the number of steps and increasing yield and purity, and using more cost-effective reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If O-(tetrahydro-2H-pyran-2-yl)hydroxylamine and EDCxHCl are used for synthesis, then the reaction can proceed, but the cost increases and explosive safety risks arise
Solution Approach 1:
The patent replaces expensive, explosive reagents (O-(tetrahydro-2H-pyran-2-yl)hydroxylamine and EDCxHCl) with inexpensive, safe alternatives (aqueous hydroxylamine and acrylic acid chloride). This substitution eliminates safety hazards and reduces manufacturing costs while maintaining reaction effectiveness.
Solution Approach 2:
The patent changes the chemical parameters of the reagents from complex protected hydroxylamine derivatives to simple aqueous hydroxylamine, and from carbodiimide coupling reagents to acid chloride. This parameter change simplifies the reaction system and eliminates the need for additional purification steps.
2Reliability
If O-(tetrahydro-2H-pyran-2-yl)hydroxylamine is used, then the reaction can proceed, but additional purification steps are required due to byproduct formation
Solution Approach 1:
The patent uses aqueous hydroxylamine which reacts cleanly with acrylic acid chloride to form N-hydroxy-acrylamide derivatives without generating byproducts that require removal. This eliminates the need for additional purification steps such as column chromatography.
Solution Approach 2:
The patent converts the potential harm of using simple aqueous hydroxylamine (which might be expected to give poor yields) into a benefit by selecting it to react with acrylic acid chloride, a reactive intermediate that ensures complete conversion without byproduct formation, thus simplifying purification.
3Manufacturing precision
If multiple synthesis steps including protecting group removal are used, then the desired product can be obtained, but the process complexity and time increase
Solution Approach 1:
The patent extracts and eliminates the unnecessary protecting group removal step from the synthesis pathway. By using aqueous hydroxylamine directly with acrylic acid chloride, the process achieves the desired product without requiring intermediate protection and deprotection steps, thereby reducing process complexity.
Solution Approach 2:
The patent performs the synthesis directly with the final reagents (aqueous hydroxylamine and acrylic acid chloride) without preliminary protection steps. This preliminary action approach eliminates intermediate steps and reduces overall process complexity while maintaining 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
The new process is more cost-effective, efficient, and eliminates the need for additional purification steps, producing high-yield, high-purity N-hydroxy-acrylamide derivatives with HDAC inhibitory activity.
Implementation Method 1
comprising a step of transforming an acrylic acid chloride intermediate into the corresponding N-hydroxy acrylamide derivative
Data Source
AI summary
Process for the preparation of a compound of formula (I) wherein R1, R2, R3, R4, R5 and R6 have the meanings as defined in the specification, comprising the step of reacting an acrylic acid chloride compound of formula (II′): wherein R1, R2, R3, R4, R5 and R6 have the meanings as defined in the specification, with aqueous hydroxylamine and optionally converting the resulting compound into an acid addition salt thereof.