Fulvestrant 3-Boronic Acid Synthesis via Crystalline Trifluoroborate
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Solution Overview
Problem
Existing processes for preparing fulvestrant-3 boronic acid involve difficult-to-handle intermediates and require complex purification steps, leading to low yield and purity due to the formation of oily boronate esters that are unstable under chromatographic conditions.
Innovation Solution
The synthesis of fulvestrant-3 boronic acid is improved by forming potassium 17-acetyl S-deoxo fulvestrant 3-trifluoroborate, a crystalline intermediate that is more stable and easier to purify, allowing for higher yields and purity without the need for chromatographic columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the known process using boronate esters is used, then fulvestrant-3 boronic acid can be synthesized, but the intermediates are difficult to isolate and purify, requiring complex purification steps that decrease yield and purity
Solution Approach 1:
The patent changes the chemical form of the intermediate from an oily boronate ester to a crystalline trifluoroborate salt by altering the chemical parameters (adding potassium fluoride and converting to trifluoroborate). This phase change from oil to crystal enables simple filtration and washing instead of complex chromatographic purification, directly resolving the contradiction between purity and purification complexity
Solution Approach 2:
The invention exploits the phase transition from liquid (oily boronate ester) to solid (crystalline trifluoroborate salt) to simplify isolation and purification. The crystalline intermediate can be easily filtered, washed, and dried without requiring chromatographic columns, thereby maintaining high purity while dramatically reducing process complexity
2Productivity
If the known process using boronate esters is used, then fulvestrant-3 boronic acid can be synthesized, but the oily intermediates are unstable under chromatographic conditions, resulting in formation of undesired products and loss of yield
Solution Approach 1:
By changing the chemical parameters to form a trifluoroborate salt instead of a boronate ester, the intermediate gains superior stability under chromatographic conditions. The ionic character and crystal lattice structure of the trifluoroborate prevent decomposition and side reactions, ensuring high yield throughout the purification process
Solution Approach 2:
The invention replaces the unstable, short-lived oily intermediate with a stable, isolable crystalline intermediate that can be handled and purified without degradation. This disposable-like approach of creating a stable intermediate form allows the process to proceed reliably through multiple steps without loss of material
3Manufacturing precision
If the known process is used, then fulvestrant-3 boronic acid synthesis can proceed, but complex purification steps are required which decrease the overall yield
Solution Approach 1:
The phase transition to a crystalline solid enables simple gravity filtration and washing steps that achieve high purity without the material losses inherent in chromatographic methods. The crystal form naturally excludes impurities during formation, providing purification without sacrificing yield
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 approach results in a product with purity greater than 95% without chromatography, achieving high yield and stability throughout the purification process, overcoming the drawbacks of previous methods by using a crystalline intermediate that avoids the use of oily intermediates.
Implementation Method 1
the compound of formula (III), obtained from the above transformation, is a crystalline solid. Said crystalline solid can be obtained by adding a mixture of a suitable hydrocarbon and water (crystallization mixture) to the mixture of reaction end to obtain the precipitation of the compound of formula (III)
Data Source
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AI summary
The invention relates to a process for the preparation of fulvestrant 3- boronic, comprising the transformation of the compound of formula (IV) into the compound of formula (III). The intermediate of formula (III) also forms part of the present invention. Fulvestrant 3-boronic acid is obtained with high purity.