Diazaspiro Lactam Synthesis Through Coupling-Agent Amide Formation
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Solution Overview
Problem
There is a need for economical and facile processes to prepare diazaspiro lactam compounds, which are NMDA receptor modulators useful for treating conditions such as depression.
Innovation Solution
A process involving the use of coupling agents in organic solvents to form amide bonds between specific compounds, including carbodiimides and other coupling agents, to produce diazaspiro lactam compounds, with optional use of organic bases and various solvents like DMF, DMSO, and THF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods are used to prepare diazaspiro lactam compounds, then the compounds can be produced, but the process is not economical and not facile
Solution Approach 1:
The patent changes the reaction parameters by using specific coupling agents (carbodiimides, phosphonium salts, uronium salts) and organic bases in organic solvents, which transforms the manufacturing process to be both economical and facile while maintaining high productivity. This parameter optimization resolves the contradiction between ease of manufacture and production efficiency.
Solution Approach 2:
The patent introduces coupling agents as intermediary substances that facilitate the formation of amide bonds between carboxylic acids and amines. These intermediaries (carbodiimides, phosphonium salts, uronium salts) enable the reaction to proceed under mild conditions with high efficiency, making the process both easy to manufacture and highly productive.
2Reliability
If complex multi-step processes are used to form amide bonds, then complete reactions can be achieved, but the process becomes costly and complicated
Solution Approach 1:
The patent uses coupling agents as intermediaries that enable complete amide bond formation in a single straightforward step. The coupling agents activate the carboxylic acid to form reactive intermediates that readily react with amines, ensuring complete reaction without requiring complex multi-step procedures, thus reducing process complexity while maintaining reliability.
Solution Approach 2:
The patent optimizes reaction parameters by selecting appropriate coupling agents and organic bases that work under mild conditions in organic solvents. This parameter optimization allows complete reaction in a simplified single-step process, resolving the contradiction between reaction completeness and process complexity.
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 a cost-effective and efficient method for producing diazaspiro lactam compounds, which are useful as NMDA receptor modulators.
Implementation Method 1
contacting a compound of formula II and a coupling agent in an organic solvent to obtain a compound of formula I... wherein the coupling agent comprises an art recognized agent for coupling an amine and carboxylic acid to form an amide bond
Data Source
AI summary
Processes for producing diazaspiro lactam compounds and intermediates useful in the processes.