Rosuvastatin Calcium Synthesis via Recrystallization
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Solution Overview
Problem
Current methods for producing Rosuvastatin calcium are complex and costly, with low purity and high diastereomer content, making large-scale industrial production challenging due to the need for column chromatography and difficulty in purifying the compound.
Innovation Solution
An optimized synthesis method that includes asymmetric reduction, hydrolysis, and recrystallization steps to produce highly purified Rosuvastatin calcium without the need for column chromatography, improving yield and purity while reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column chromatography is used to purify Rosuvastatin calcium, then purity is improved, but device complexity and production cost increase
Solution Approach 1:
The patent changes the purification parameter from column chromatography (complex separation mechanism) to recrystallization (simple solubility-based separation). By optimizing the recrystallization conditions using specific solvents and temperature controls, the process achieves high purity without requiring complex chromatographic equipment, thus resolving the contradiction between purity and process complexity
Solution Approach 2:
The patent extracts and removes impurities through a simplified recrystallization process that selectively separates Rosuvastatin calcium from impurities based on solubility differences. This extraction method eliminates the need for column chromatography, reducing both device complexity and operational difficulty while maintaining high purity
2Manufacturing precision
If column chromatography is used to purify Rosuvastatin calcium, then purity is improved, but production cost increases
Solution Approach 1:
The patent changes the purification approach from expensive column chromatography to cost-effective recrystallization. By optimizing recrystallization parameters such as solvent selection, temperature profiles, and cooling rates, the process achieves comparable or superior purity at significantly lower cost, making industrial production economically viable
Solution Approach 2:
The patent employs simple, inexpensive recrystallization materials (common solvents like ethanol or acetone) instead of expensive column chromatography systems. These disposable, easily obtainable materials enable high-purity purification without the high capital and operational costs associated with chromatographic equipment
3Productivity
If conventional synthesis method is used, then Rosuvastatin calcium can be produced, but yield is low and purity is insufficient
Solution Approach 1:
The patent applies preliminary action by introducing a recrystallization step before the final purification stage. This preliminary recrystallization removes major impurities early in the process, preventing them from carrying through to subsequent steps. As a result, the final product achieves high purity with high yield, as the recrystallization step protects the product from degradation and loss
4Manufacturing precision
If conventional synthesis method is used, then Rosuvastatin calcium can be produced, but diastereomer content is high
Solution Approach 1:
The patent changes the purification parameter to exploit the different solubility characteristics of diastereomers. By optimizing recrystallization conditions (temperature, solvent composition, cooling rate), the process selectively precipitates the desired diastereomer while leaving unwanted diastereomers in the mother liquor, achieving high diastereomer purity without complex chromatographic separation
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 method achieves high yield and purity of Rosuvastatin calcium, suitable for large-scale industrial production, with a significant reduction in production costs and improved control of impurities, making it more suitable for industrialization.
Implementation Method 1
the compound shown as Formula 5 undergoes asymmetric reduction in the presence of R2
Implementation Method 2
The esterification is carried out between the compound as shown in Formula 8 and a halohydrocarbon
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
.A preparation method of rosuvastatin calcium (Formula 1), which can be used for the production of medicament lowering the levels of LDL-cholesterol and triglycerides in vivo, is provided. Such preparation method is suitable for industrial production. Furthermore, the intermediate crystallines used in the preparation method are provided.