Amantadine Nitrate Synthesis with Controlled Nitration and Reagent Use
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Solution Overview
Problem
Existing methods for producing amantadine derivatives fail to optimize the use of reagents, leading to high waste, increased costs, and unsuitable conditions for industrial production, with the nitration reaction resulting in low yields and rapid formation of side products.
Innovation Solution
A process is developed that optimizes the use of reagents, adjusts reaction conditions, and includes steps such as bromination, carboxylation, acetylation, reduction, hydrolysis, Boc protection, nitrate esterification, and salt formation, using controlled amounts of strong acids and bases, and employs solvents like polyethylene glycol and ethanol for industrial-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high dose of strong acids and bases are used in the reaction, then the reaction proceeds rapidly, but reagent waste increases and production costs rise
Solution Approach 1:
The patent optimizes the concentration and dosage parameters of strong acids and bases in each reaction step. Specifically, it controls the molar ratio of reactants, adjusts acid-base dosage to precise ranges, and optimizes reaction temperature and time parameters to achieve high conversion rates with minimal reagent excess, thereby reducing waste while maintaining productivity
Solution Approach 2:
The patent applies partial action by using precisely controlled amounts of reagents rather than large excesses. It optimizes the stoichiometric ratios of reactants in bromination, nitration, and other steps to use only the necessary amount of reagent needed for complete conversion, avoiding unnecessary excess that would become waste
2Speed
If traditional nitration conditions are used, then the reaction proceeds quickly, but side products form rapidly and yield decreases
Solution Approach 1:
The patent employs dynamic control of nitration reaction conditions, including staged addition of nitrating agents, progressive temperature adjustment, and real-time monitoring of reaction progress. This dynamic approach allows the reaction to proceed at optimal rates while preventing side reactions that would reduce yield
Solution Approach 2:
The patent prepares the nitration system in advance by pre-mixing reagents at controlled temperatures, pre-cooling reaction vessels, and preparing catalysts before the main reaction. This preliminary preparation ensures that when nitration begins, conditions are already optimized for high yield while maintaining controlled reaction speed
3Manufacturing precision
If traditional purification methods are used, then product purity is achieved, but the process is not suitable for industrial batch production
Solution Approach 1:
The patent extracts and removes impurities at multiple stages through optimized filtration, washing, and extraction procedures. It uses selective solvent systems to extract desired products while leaving impurities behind, and employs controlled precipitation to separate products from reaction mixtures in a manner suitable for industrial batch processing
Solution Approach 2:
The patent divides the purification process into multiple discrete stages, each targeting specific types of impurities. This segmented approach includes separate steps for removing inorganic salts, organic by-products, and colored impurities, making the overall purification process more manageable and scalable for industrial production
4Productivity
If high temperature and high dose reagents are used, then hydrolysis is efficient, but energy consumption and costs increase
Solution Approach 1:
The patent optimizes hydrolysis parameters by adjusting temperature, pH, and reaction time to achieve maximum efficiency at lower energy input. It uses controlled pH adjustment with buffers and optimizes temperature profiles to maintain high hydrolysis rates without requiring excessive thermal energy
Solution Approach 2:
The patent introduces catalysts and buffering agents as intermediaries to facilitate hydrolysis at milder conditions. These intermediaries lower the activation energy required for hydrolysis, allowing the reaction to proceed efficiently at lower temperatures and with reduced reagent dosages, thereby decreasing energy consumption
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 reduces reagent usage, lowers production costs, minimizes waste, and increases yields, making it environmentally friendly and suitable for industrial production while maintaining high reaction efficiency.
Implementation Method 1
reacting a substituted or unsubstituted adamantane with liquid bromine in reflux for 4-6 h to obtain bromoadamantane
Implementation Method 2
adding sodium oxalate and water, the reaction system being refluxed at 75 °C via hydrolysis to obtain a substituted or unsubstituted adamantanol
Implementation Method 3
The condensation product was nitrated with a nitrating reagent mixed with fuming nitric acid and acetic anhydride
Implementation Method 4
reacting a substituted or unsubstituted adamantane with liquid bromine in reflux for 4-6 h to obtain bromoadamantane; adding sodium oxalate and water, the reaction system being refluxed at 75 °C via hydrolysis to obtain a substituted or unsubstituted adamantanol
Data Source
AI summary
The present invention provided a process for manufacture of amantadine nitrate derivatives, and the process comprises using adamantane as the raw material to prepare amantadine nitrate derivatives via the following steps: (1) synthesis of adamantanol; (2) carboxylation of adamantanol; (3) acetylation of adamantanoic acid; (4) reduction; (5) hydrolysis of amido adamantanol and Boc protection of amino group; (6) crystallization of Boc protected amantadinol; (7) nitrate esterification of Boc protected amantadinol; (8) refining of the product of nitrate esterification; (9) Boc deprotection and salt formation; and (10) refining of amantadine nitrate hydrochloride. The amantadine nitrate derivatives have the struction of: wherein, R1 and R2 are each independently hydrogen, straight-chain or branched-chain alkyl, or substituted or unsubstituted aryl or heteroaryl. The process of this invention is efficient, cost effective, environmentally friendly, safe, reliable, and suitable for industrial production.