Naloxone-DMF Solvate Crystallization for High-Purity Production
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Solution Overview
Problem
Existing methods for producing naloxone in larger quantities are complex, energy-intensive, and result in high waste production, with unsatisfactory yields and purity, making them unsuitable for pharmaceutical use.
Innovation Solution
The use of a crystalline naloxone-dimethylformamide solvate as a reagent in a method involving seeding or spontaneous precipitation in a dimethylformamide medium, followed by solvent treatment to release naloxone, reduces the number of steps, energy consumption, and waste, while enhancing purity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If complex separation and purification steps are used to isolate naloxone in larger quantities, then the quantity of naloxone obtained is improved, but energy consumption increases and synthesis time increases
Solution Approach 1:
The patent extracts the purification function from multiple complex steps and concentrates it into a single crystallization step. By forming a solvate complex with DMF, the naloxone is selectively precipitated from the reaction mixture, separating it from impurities in one operation rather than requiring multiple separation steps.
Solution Approach 2:
The patent changes the physical-chemical parameters of the system by introducing DMF as a solvent and forming a solvate complex. This parameter change enables the naloxone to precipitate in a different physical state (solvate form) with distinct solubility characteristics, allowing for efficient separation and purification in a single step.
2Quantity of substance
If complex separation and purification steps are used to isolate naloxone in larger quantities, then the quantity of naloxone obtained is improved, but synthesis time increases
Solution Approach 1:
The patent merges multiple separation and purification operations into a single crystallization step. By combining filtration, washing, and crystallization into one integrated operation, the process eliminates the time required for multiple separate purification steps while maintaining high quantity and purity of naloxone.
Solution Approach 2:
The patent performs preliminary action by forming the solvate complex during the reaction itself, which pre-separates the naloxone from impurities before the workup step. This preliminary separation action eliminates the need for subsequent complex purification steps, reducing overall synthesis time.
3Quantity of substance
If complex separation and purification steps are used to isolate naloxone in larger quantities, then the quantity of naloxone obtained is improved, but waste material production increases
Solution Approach 1:
The patent converts the potentially harmful effect of impurities in the reaction mixture into a beneficial selective precipitation effect. By exploiting the different solubility characteristics of naloxone-DMF solvate versus impurities, the process selectively precipitates only the desired product, converting what would be waste into a useful separation mechanism.
Solution Approach 2:
The patent discards the DMF solvent after the crystallization step, which carries away the impurities with it. The naloxone-solvate complex is recovered in high purity form, and the DMF can be recovered and reused, minimizing waste generation while maintaining high quantity and purity of the final product.
4Reliability
If conventional methods are used for producing naloxone, then the process is established, but the final yield is not completely satisfactory
Solution Approach 1:
The patent changes the reaction parameters by using DMF as a solvent and forming a solvate complex, which improves the final yield. The solvate formation shifts the equilibrium and enables more complete conversion of the starting material, while the crystallization step ensures high purity, thus improving both reliability and productivity.
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 allows for the production of naloxone in higher purity and yield with reduced energy consumption and waste, making it suitable for pharmaceutical use.
Implementation Method 1
stirring the first reaction mixture received in step S2) for a time period sufficient for a second amount of crystalline naloxone-dimethylformamide solvate (according to the present invention as described herein or as described herein as being preferred) to precipitate as a solid
Implementation Method 2
adding to the crystalline naloxone-dimethylformamide solvate received in step S3) as precipitated solid a solvent or solvent mixture suitable to release naloxone of formula I from said crystalline naloxone-dimethylformamide solvate
Data Source
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Figure 3a
AI summary
Described herein is a crystalline naloxone-dimethylformamide solvate and methods of making a first and a second amount thereof, as well as methods of making naloxone or a naloxone salt, involving said crystalline naloxone-dimethylformamide solvate. Further described herein is the use of dimethylformamide for preparing said crystalline naloxone-dimethylformamide solvate and the use of said crystalline naloxone-dimethylformamide solvate as a reagent for i.a. purifying naloxone. Moreover, it is described a crystalline naloxone and a mixture comprising dimethylformamide and said crystalline naloxone-dimethylformamide solvate. Naloxone has the following formula I: