6-Substituted Isoquinolinone Process for Easier Purification
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Solution Overview
Problem
Current synthetic routes for preparing 6-substituted-1-(2H)-isoquinolinone compounds generate undesirable by-products like dimethylamine and pyrrolidine, which are difficult to purify, and produce intermediates with poor crystalline properties and mutagenic side-products.
Innovation Solution
A new process involving the reaction of compounds of formula (II) and (III) to form intermediates (IV) and further derivatives (V), using specific protecting groups and leaving groups to avoid the formation of problematic by-products and improve crystallinity, followed by oxidation to obtain compounds of formula (V) and (I).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If current synthetic routes are used to prepare 6-substituted-1-(2H)-isoquinolinone compounds, then the target compounds can be synthesized, but difficult-to-purge by-products like dimethylamine and pyrrolidine are generated
Solution Approach 1:
The patent extracts and eliminates the source of harmful by-products by using alternative synthetic routes that do not generate dimethylamine and pyrrolidine. The invention employs specific protecting groups and leaving groups that prevent formation of these problematic by-products while maintaining synthesis efficiency.
Solution Approach 2:
The patent introduces specific protecting groups (intermediary substances) that mediate the synthesis process. These protecting groups enable the reaction to proceed without generating harmful by-products, and can be removed later in the synthesis sequence without compromising the target compound.
2Ease of manufacture
If current synthetic routes are used, then target compounds can be prepared, but intermediates with poor crystalline properties are generated
Solution Approach 1:
The patent changes the chemical parameters of the intermediates by using different protecting groups and reaction conditions. These parameter changes result in intermediates with improved crystalline properties, enabling better isolation and purification while maintaining the synthesis pathway to the target compound.
3Ease of manufacture
If current synthetic routes are used, then 6-substituted isoquinolinone compounds can be synthesized, but mutagenic side-products are generated
Solution Approach 1:
The patent converts potentially harmful reaction conditions into beneficial ones by using specific protecting groups and leaving groups. These choices enable the synthesis to proceed efficiently while preventing the formation of mutagenic side-products, turning a potentially harmful process into a safe one.
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 minimizes the generation of difficult-to-purge by-products and improves the crystalline properties of intermediates, facilitating easier isolation and purification, while avoiding mutagenic side-products.
Implementation Method 1
reacting a compound of formula (IV) with an oxidizing agent to form a compound of formula (V)
Data Source
AI summary
The invention relates to substituted 6-substituted isoquinoline oxide compounds of formula (V)and to a process for making them. The compounds of formula (V) can be used as intermediates for making 6-substituted-1-(2H)-isoquinolinone compounds of formula (I)The compounds of formula (I) are inhibitors of the enzyme Rho-kinase, or can be used as intermediates in the preparation of further inhibitors of the Rho-kinase enzyme.