Radiohalogen Labeling Precursor with Hydrophobic Amide Tag

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Solution Overview

Problem

Existing radioactive halogen labeling precursor compounds face a trade-off between high reactivity and stability, leading to inefficient labeling reactions.

Innovation Solution

A radioactive halogen labeling precursor compound with a trifluoromethanesulfonyloxy group and a hydrophobic amide tag is introduced, enhancing both reactivity and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a highly reactive labeling precursor compound is used, then the reactivity of the labeling reaction is improved, but the stability of the precursor compound deteriorates

Engineering Contradiction:

Improvereactivity of labeling reactionVSAvoidstability of precursor compound

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent modifies the chemical structure of the leaving group by introducing a hydrophobic amide tag to the trifluoromethanesulfonyloxy group. This structural parameter change creates a balance between reactivity and stability, allowing the precursor compound to maintain high reactivity for efficient labeling while the hydrophobic tag provides enhanced stability and enables simple separation methods

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The precursor compound combines two functional components: the trifluoromethanesulfonyloxy group (providing high reactivity) and the hydrophobic amide tag (providing stability and separation capability). This composite structure resolves the contradiction by integrating both reactive and stable characteristics in a single molecule

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If a hydrophobic amide tag is introduced to the leaving group, then the stability and separability are improved, but the complexity of the precursor compound structure increases

Engineering Contradiction:

Improvestability of precursor compoundVSAvoidstructural complexity of precursor compound

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The hydrophobic amide tag serves multiple functions simultaneously: it enhances the stability of the precursor compound, provides a basis for simple separation through hydrophobic interactions, and maintains compatibility with the reactive trifluoromethanesulfonyloxy group. This multi-functionality justifies the additional structural complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4282857B1Radioactive halogen-labeled precursor compound

Publication Date: 2026.04.15 NIPPON SANSO CORP

Figure 1

AI summary

Provided is, as a radioactive halogen labeling precursor compound that is highly reactive and stable, a compound represented by the following general formula (II) : wherein R1 and R2 each independently represent an alkyl group having 5 to 20 carbon atoms, X1 and X2 each independently represent a halogen atom, and R3 represents a monovalent group derived from a sugar, or the like.