Fluorinated Norepinephrine Transporter Tracer for PET Imaging
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Solution Overview
Problem
There is a need for an alternative tracer that binds to the norepinephrine transporter (NET) for diagnostic methods, particularly for diagnosing disorders related to the generation, degradation, distribution, or function of NET.
Innovation Solution
A compound with the formula , where R1 is an F or an I residue, specifically an F residue, is provided. This compound is used as a tracer in diagnostic methods and is synthesized through a series of steps involving chloroalkylation, Wittig reaction, reduction, Mitsunobu reaction, and radiolabeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing NET tracers are used, then NET binding is achieved, but alternative tracers are needed for diagnostic applications
Solution Approach 1:
The patent modifies the molecular structure of NET tracers by changing chemical parameters - specifically introducing a fluorine atom at the 4-position of the benzene ring and varying the side chain length (propoxy vs ethoxy groups). This creates new tracer compounds (18F-4F-PHPG and 18F-4F-EPG) with different pharmacokinetic properties while maintaining NET binding affinity, thereby providing alternative tracers for diagnostic applications.
2Duration of action of stationary object
If fluorine-18 labeled tracers are used, then long half-life enables production and distribution, but synthesis complexity increases
Solution Approach 1:
The patent employs preliminary action by using pre-formed building blocks with protected functional groups that can be radiolabeled in a single step. The synthesis路线 is designed so that the fluorine-18 labeling occurs at an intermediate stage, and the remaining steps complete the molecule formation. This approach simplifies the overall synthesis compared to traditional methods while utilizing the long half-life of fluorine-18 for centralized production and distribution.
3Duration of action of moving object
If tracers with long neuronal retention times are used, then vesicular uptake is confirmed, but diffusion from storage vesicles occurs
Solution Approach 1:
The patent introduces a fluorine atom at the 4-position of the benzene ring, creating a local structural modification that affects the tracer's interaction with neuronal structures. This specific positional modification (4-position substitution) appears to enhance binding affinity and reduce diffusion from storage vesicles while maintaining the long neuronal retention time characteristic of vesicular uptake mechanisms.
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 compound shows a slow uptake and quick flushing out by the liver, making it suitable for diagnostic methods such as Positron Emission Tomography (PET). It effectively binds to NET and is efficient in diagnostic applications, including imaging cardiac sympathetic innervation.
Implementation Method 1
a compound... for use in a diagnostic method... for diagnosing a disorder in generation, degradation, distribution or function of norepinephrine transporter (NET)... effectively binds to NET
Implementation Method 2
several tracers that bind to NET and that can be detected in Positron Emission Tomography (PET)... suitable for diagnostic methods such as Positron Emission Tomography (PET)
Data Source
AI summary
A compound according to following formula can be prepared,where R1 is an F or I residue.