Delmopinol Intermediate Synthesis via Catalytic Hydrogenation
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Solution Overview
Problem
Current methods for producing delmopinol are inefficient, costly, and rely on multistep processes with low yields and restricted materials, making them unsuitable for industrial-scale production.
Innovation Solution
A process involving the conversion of 1-halo-4-propylhept-3-ene to 1-halo-4-propylheptane through catalytic hydrogenation, followed by reaction with oxazolidine[2,3-c]morpholine, to produce delmopinol, using improved conditions to minimize dehalogenation and achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multistep processes are used to produce 4-propylheptan-1-ol from γ-butyrolactone, then the synthesis can be accomplished, but the overall yield is low (58%) and the process is complex
Solution Approach 1:
The synthesis route is segmented into distinct stages: first producing 4-propylhept-3-ene, then converting to 1-halo-4-propylhept-3-ene, and finally to 1-halo-4-propylheptane. This segmentation allows optimization of each step independently, improving overall efficiency and yield while reducing process complexity.
Solution Approach 2:
The invention introduces preliminary formation of the carbon-carbon double bond (4-propylhept-3-ene) before halogenation. This preliminary action creates a more reactive intermediate that facilitates subsequent halogenation and Grignard reactions, improving overall yield and reducing the number of steps required.
2Manufacturing precision
If traditional halogenation methods are used to produce 1-halo-4-propylheptane, then the intermediate can be obtained, but dehalogenation side reactions occur and purity is compromised
Solution Approach 1:
The invention uses 1-halo-4-propylhept-3-ene as an intermediary compound with a strategically placed double bond. This intermediary structure directs the halogen to the terminal position and prevents dehalogenation side reactions, thereby improving manufacturing precision and purity of the final product.
Solution Approach 2:
The invention changes the chemical parameters by introducing a double bond at the 3-position, which alters the reactivity and stability of the intermediate. This parameter change prevents unwanted dehalogenation reactions and ensures high purity of 1-halo-4-propylheptane.
3Ease of manufacture
If commercially unavailable or restricted materials are used in the synthesis, then the process can proceed, but the cost increases and industrial applicability is reduced
Solution Approach 1:
The invention replaces restricted materials like γ-butyrolactone with readily available, inexpensive starting materials such as 4-propylhept-3-ene. This substitution uses common, non-restricted chemicals that are easily obtainable and cost-effective, greatly improving ease of manufacture and industrial applicability.
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 a cost-effective and efficient route to producing high-purity delmopinol, suitable for industrial-scale production, by optimizing the synthesis of intermediates and reducing side reactions and waste.
Implementation Method 1
1-halo-4-propylhept-3-ene (IV) is converted to 1-halo-4-propylheptane (V) by catalytic hydrogenation
Data Source
AI summary
The present invention relates to a new process for producing intermediates useful in the manufacture of 2-(3-(4-propylheptyl)morpholino)ethan-1-ol. The invention also relates to intermediates 1-chloro-4-propylhept-3-ene and 1-iodo-4-propyl-hept-3-ene.