Diazaspiro Undecanone Synthesis With Two-Pot Cyclization
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Solution Overview
Problem
Existing processes for synthesizing 1,4-diazaspiro[5.5]undecan-3-one are inefficient, requiring multiple steps, harsh chemical reactions, and low yields.
Innovation Solution
A two-pot process involving the reaction of cyclohexanone with nitromethane to form 1-(nitromethyl)cyclohexan-1-ol, followed by conversion to 1-(aminomethyl)cyclohexyl)glycinate and internal cyclization, allowing for combined mechanistic steps in the same reaction vessel without isolation, and using recrystallization or filtration for high yield isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multistep process with protecting and deprotecting steps is used to control selectivity, then the desired heteroaryl group can be added by nucleophilic aromatic substitution, but the number of steps increases and manufacturing efficiency decreases
Solution Approach 1:
The invention extracts and eliminates the unnecessary protecting and deprotecting steps from the synthesis pathway. By using a spirocyclic diamine core with inherently selective amino groups, the process removes these redundant operations while maintaining control over reaction selectivity, thereby reducing the total number of steps and improving manufacturing efficiency
Solution Approach 2:
The spirocyclic diamine core structure provides self-service by inherently controlling the selectivity of amino group reactions without requiring external protecting groups. The molecular structure itself ensures that the first amino group reacts preferentially, eliminating the need for additional protective measures and simplifying the overall process
2Reliability
If harsh chemical reactions and cryogenic cooling are used, then certain chemical transformations can be achieved, but hazardous reagents are required and safety risks increase
Solution Approach 1:
The invention changes the reaction parameters by employing milder conditions instead of harsh chemical reactions and cryogenic cooling. The use of the spirocyclic diamine core enables reactions to proceed under safer, more controlled conditions while maintaining effectiveness, thereby eliminating hazardous reagents and reducing safety risks
Solution Approach 2:
The invention converts the potential harm of requiring harsh conditions into a benefit by designing a reaction pathway that naturally proceeds under milder conditions. The unique spirocyclic diamine structure facilitates selective reactions without needing extreme conditions, turning what would have been a safety hazard into a safer, more efficient process
3Manufacturing precision
If multiple isolation and purification steps are used, then product purity can be maintained, but the number of steps increases and overall synthesis time increases
Solution Approach 1:
The invention merges multiple isolation and purification steps into a single streamlined operation. By optimizing the reaction pathway using the spirocyclic diamine core, the process consolidates purification requirements, maintaining high product purity while significantly reducing the time and complexity associated with multiple sequential isolation steps
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 achieves higher yields, reduces the number of steps, and eliminates the need for hazardous reagents and cryogenic cooling, resulting in improved manufacturing efficiency and reduced overall time.
Implementation Method 1
the Henry reaction, elimination, and Michael addition can all be combined in one reaction
Implementation Method 2
the reduction, hydrolysis and cyclization reaction can also be combined in one reaction
Implementation Method 3
This compound then internally cyclizes to produce 1,4-diazaspiro[5.5]undecan-3-one
Implementation Method 4
which then loses water to produce (nitromethylene)cyclohexane
Implementation Method 5
An alkyl glycinate is then added to (nitromethylene)cyclohexane to produce alkyl (1-(nitromethyl)cyclohexyl)glycinate
Data Source
Figure 1
AI summary
This invention provides a process for preparing 1,4-diazaspiro[5.5]undecan-3-one and analogues thereof that are useful in the preparation of pharmaceutical compound, including for the treatment of disorders involving abnormal cellular proliferation. Chemical intermediates in the process are also provided.