Oxymorphone Hydrogenation Temperature Control
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Solution Overview
Problem
Existing methods for synthesizing oxymorphone alkaloid and its salts, such as oxymorphone hydrochloride, face challenges with high impurity levels of 6α-oxymorphol, which require additional processing steps, extending production time and reducing yield.
Innovation Solution
A process involving hydrogenation of an aqueous solution of 14-hydroxymorphinone and an acid at temperatures between 55 °C to 95 °C in the presence of a hydrogenation catalyst, minimizing 6α-oxymorphol impurities to ≤2.00 area % as determined by HPLC, and adjusting pH to optimize impurity profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogenation is carried out at ambient temperature (30°C or less), then the reaction conditions are mild and easy to control, but the impurity profile deteriorates with high levels of 6α-oxymorphol
Solution Approach 1:
The patent applies parameter changes by raising the hydrogenation temperature from ambient (30°C or less) to elevated temperatures (40-95°C). This temperature parameter change fundamentally alters the reaction pathway to favor the formation of oxymorphone while suppressing the formation of 6α-oxymorphol impurity, achieving an impurity profile of ≤2.00 area % 6α-oxymorphol
2Reliability
If additional processing steps are added to reduce 6α-oxymorphol impurities, then the impurity profile improves, but the production time increases and yield decreases
Solution Approach 1:
The patent applies preliminary action by optimizing the hydrogenation conditions upfront to prevent 6α-oxymorphol formation during the main reaction. By conducting hydrogenation at elevated temperatures (40-95°C) from the outset, the process achieves ≤2.00 area % 6α-oxymorphol directly, eliminating the need for subsequent purification steps to remove this impurity and thereby maintaining high productivity
3Reliability
If hydrogenation is carried out at elevated temperatures (≥55°C to ≤95°C), then 6α-oxymorphol impurities are minimized to ≤2.00 area %, but the reaction requires more energy input
Solution Approach 1:
The patent applies parameter changes by optimizing the temperature range to ≥55°C to ≤95°C for hydrogenation. This specific temperature parameter change achieves the dual benefit of minimizing 6α-oxymorphol impurities to ≤2.00 area % while maintaining reasonable energy consumption levels, as the reaction proceeds efficiently at these temperatures without requiring excessive heating
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 process significantly reduces 6α-oxymorphol levels, minimizing the need for further processing and improving the overall impurity profile of oxymorphone acid adducts and alkaloids, enhancing yield and efficiency in large-scale production.
Implementation Method 1
hydrogenating an aqueous solution of 14-hydroxymorphinone and an acid in water to form a solution of the oxymorphone acid adduct product, wherein: the hydrogenation is carried out at one or more temperatures in the range of ≥ 55 °C to ≤ 95 °C in the presence of a hydrogenation catalyst and hydrogen gas
Implementation Method 2
the hydrogenation is carried out at one or more temperatures in the range of ≥ 55 °C to ≤ 95 °C in the presence of a hydrogenation catalyst and hydrogen gas
Data Source
AI summary
The present invention provides a process for preparing an oxymorphone acid adduct, said process comprising hydrogenating an aqueous solution of 14-hydroxymorphinone and an acid to form a solution of the oxymorphone acid adduct, wherein the hydrogenation iscarried out at one or more temperatures greater than 40°C in the presence of a hydrogenation catalyst and hydrogen gas, wherein the level of 6α-oxymorphol produced is ≤ 3.00area % as determined by HPLC.