Radiolabeled Tyrosine Synthesis via Boronic Acid Coupling
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Solution Overview
Problem
Existing methods for producing radiolabeled tyrosine derivatives, such as 211At-AAMT, are unsafe due to the use of hazardous substances like mercury, result in variable yields, and produce impurities, making them unsuitable for industrial pharmaceutical production and unstable.
Innovation Solution
A method involving the production of tyrosine boronic acid derivatives using a palladium catalyst and specific protecting groups to introduce a boryl group, followed by reaction with radionuclides to produce radiolabeled tyrosine derivatives without hazardous substances, ensuring high purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods (Mitsunobu reaction, nucleophilic substitution, etc.) are used to synthesize boronic acid compounds, then various compounds can be produced, but the processes involve multiple steps, require harsh reaction conditions, use toxic reagents, and result in low yields and high costs
Solution Approach 1:
The patent changes the reaction parameters by using a palladium catalyst system with specific ligands under mild conditions (room temperature or mild heating, atmospheric pressure) to achieve high-yielding cross-coupling reactions between aryl halides and boronic acids, replacing harsh conventional methods
Solution Approach 2:
The patent introduces a palladium catalyst as an intermediary to mediate the cross-coupling reaction between aryl halides and boronic acids, enabling the transformation to proceed under mild conditions with high efficiency, avoiding the need for toxic reagents and multiple steps
2Reliability
If conventional synthesis methods are used, then various boronic acid compounds can be obtained, but the processes require harsh reaction conditions and toxic reagents
Solution Approach 1:
The patent creates a benign reaction environment by using palladium-catalyzed cross-coupling conditions that proceed under atmospheric pressure and mild temperatures, replacing toxic reagents with environmentally friendly catalyst systems that can operate in standard laboratory conditions
Solution Approach 2:
The patent fundamentally changes the reaction parameters from harsh conditions (high temperature, strong bases, toxic reagents) to mild conditions (room temperature or mild heating, atmospheric pressure, non-toxic catalysts), achieving the same synthetic goals with improved safety and environmental compatibility
3Reliability
If conventional methods are employed, then boronic acid compounds can be synthesized, but the processes involve multiple steps resulting in low yields and high costs
Solution Approach 1:
The patent merges multiple conventional synthesis steps into a single efficient cross-coupling reaction step, using palladium catalysis to directly couple aryl halides with boronic acids in one operation, thereby improving overall yield and reducing production costs
Solution Approach 2:
The patent employs a palladium catalyst as an efficient intermediary that enables direct cross-coupling reactions with high atom economy and yield, replacing multi-step sequences that previously required protection/deprotection steps, isolation, and purification at each stage
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 enables the production of radiolabeled tyrosine derivatives with good purity and stability, suitable for industrial pharmaceutical production, using safe and efficient processes.
Implementation Method 1
Boronic acids and their derivatives have found widespread use in catalysis, particularly in coupling reactions involving carbon-carbon bond formation, where they act as Lewis bases toward the Lewis acidic metal center
Data Source
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Figure 3~4
Figure 5
AI summary
The present invention provides a method for producing radiolabeled tyrosine derivatives with good purity and stability, by a safe method suitable for industrial production of pharmaceuticals. The present invention relates to a method for producing Compound (5) and Radiolabeled Compound (6). wherein each symbol is as defined in the description.