Delmopinol Synthesis via Oxazolidin Morpholine and Grignard Coupling
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Solution Overview
Problem
Existing processes for producing delmopinol are lengthy and require toxic reagents, making them difficult and expensive for industrial exploitation.
Innovation Solution
A short and convergent synthesis method involving a reaction between an oxazolidin[2,3-c]morpholine compound and a Grignard compound, using commercially available diethanolamine and avoiding the use of toxic reagents, to produce delmopinol with high yields and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing processes for producing delmopinol are used, then delmopinol can be produced, but the process is lengthy and requires toxic reagents making it difficult and expensive for industrial exploitation
Solution Approach 1:
The synthesis is divided into distinct modular stages: (1) formation of oxazolidin[2,3-c]morpholine from diethanolamine and haloacetate, (2) preparation of Grignard reagent from alkyl halide and magnesium, and (3) coupling reaction to form delmopinol. This segmentation allows each step to be optimized independently and facilitates industrial scaling while reducing overall process complexity.
Solution Approach 2:
The oxazolidin[2,3-c]morpholine intermediate is prepared in advance from commercially available diethanolamine and can be stored for later use. This preliminary action allows the final coupling reaction to proceed efficiently when the Grignard reagent is ready, improving overall productivity and allowing better process planning in industrial settings.
2Productivity
If existing processes for producing delmopinol are used, then delmopinol can be produced, but toxic reagents are required which make the process expensive and difficult for industrial exploitation
Solution Approach 1:
The patent replaces toxic reagents with safer alternatives: using diethanolamine (a safe, commercially available compound) instead of toxic amines, and using magnesium metal instead of highly reactive and hazardous organometallic reagents. The Grignard reagent, while reactive, can be handled with standard precautions and is generally safer than the alternatives previously used in delmopinol synthesis.
Solution Approach 2:
The process uses inexpensive, readily available starting materials (diethanolamine, magnesium, alkyl halides) that can be disposed of or treated according to standard protocols, eliminating the need for expensive specialized reagents and complex waste treatment systems required for toxic substances.
3Manufacturing precision
If a short and convergent synthesis is used, then high yields and purity are achieved, but new synthesis pathways must be developed
Solution Approach 1:
The oxazolidin[2,3-c]morpholine compound serves as a key intermediary that simplifies the overall synthesis. This intermediate can be prepared in high purity from stable starting materials and then coupled with the Grignard reagent in a single step to produce high-purity delmopinol, reducing the number of purification steps needed compared to traditional multi-step syntheses.
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 method provides an efficient and cost-effective alternative for producing delmopinol on an industrial scale, using mild reaction conditions and eliminating the need for toxic substances, resulting in high yields and purity.
Implementation Method 1
reacting a compound of formula (II) with a grignard compound of formula (III)
Implementation Method 2
the production of a specific grignard compound (IIIA) is carried out by treatment of a 1-halo-4-propylheptane with magnesium
Data Source
AI summary
A process for the preparation of delmopinol (3-(4-propylheptyl)-4-morpholinethanol) or a derivative or a pharmaceutically acceptable salt, or a solvate thereof, including a hydrate, comprises reacting oxazolidin [2,3-c]morpholine and a Grignard reagent, and optionally converting the delmopinol (or derivative) free base into a pharmaceutically acceptable salt. The oxazolidin [2,3-c]morpholine and the Grignard reagent are useful as intermediates in the production process.