Aza-cryptophanes for MRI Contrast Agent Solubility
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Solution Overview
Problem
Conventional cryptophanes have poor solubility in biocompatible media and require inefficient synthesis steps for functionalization, limiting their use in in vivo diagnostic tools and MRI imaging with hyperpolarized xenon.
Innovation Solution
Development of aza-cryptophanes with enhanced solubility and easy functionalization capabilities, allowing for the formation of nanoemulsions and complexation with hyperpolarized noble elements like xenon for improved MRI imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cryptophanes are used for MRI imaging with hyperpolarized xenon, then high contrast detection is achieved, but poor solubility in biocompatible media limits in vivo application
Solution Approach 1:
The patent modifies the chemical structure of cryptophane by replacing carbon atoms with nitrogen atoms at specific positions (X1, X2, X3) in the cyclotriveratrylene units. This chemical parameter change introduces polarity and hydrogen bonding capability, fundamentally altering the solubility characteristics while preserving the cage structure's ability to encapsulate and detect hyperpolarized xenon with high contrast.
Solution Approach 2:
The invention creates a composite molecular structure combining the hydrophobic cryptophane cage framework with hydrophilic nitrogen-containing functional groups. This composite approach integrates the contrasting properties of both components: the xenon-binding capability of the original cryptophane and the water solubility enhancement from the nitrogen-containing groups, enabling biocompatible formulation.
2Adaptability or versatility
If monofunctionalised cryptophane precursors are synthesized from symmetrical cryptophane via monodeprotection, then functionalization capability is achieved, but synthesis yield becomes very poor
Solution Approach 1:
The patent incorporates nitrogen atoms and functional groups directly into the cryptophane structure during the initial synthesis of the cyclotriveratrylene units, rather than attempting to introduce them later through deprotection reactions. This preliminary incorporation ensures that the functionalization capability is built-in from the start, avoiding the low-yield monodeprotection step entirely.
Solution Approach 2:
Instead of starting with a symmetrical cryptophane and removing protecting groups to create functional sites (the conventional approach), the invention inverts the strategy by designing asymmetrical nitrogen-containing cryptophanes where functional sites are inherently present. This reverses the synthetic logic from deconstruction to direct construction, dramatically improving yield.
3Adaptability or versatility
If conventional cryptophanes are used for selective targeting, then vectorization capability is required, but synthesis complexity increases due to multiple protection steps
Solution Approach 1:
The nitrogen-containing cryptophane structure provides multiple functional nitrogen atoms (X1, X2, X3) that can each serve as attachment points for different targeting moieties, linkers, or probes. This multi-functionality allows a single cryptophane scaffold to enable selective targeting without requiring multiple different protected precursors, simplifying the overall synthesis process.
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
Aza-cryptophanes provide enhanced solubility and functionalization options, enabling effective use in nanoemulsions and improved MRI imaging with hyperpolarized xenon, addressing the limitations of conventional cryptophanes.
Implementation Method 1
Cryptophanes are cage molecules capable of encapsulating atoms or small molecules
Implementation Method 2
The enhanced solubility of the aza-cryptophanes has also enabled to prepare nanoemulsions thanks to said aza-cryptophanes
Data Source
AI summary
The present invention concerns aza-cryptophanes, processes for preparation thereof, and their uses, in particular as in vivo diagnostic tools when complexing a hyperpolarized noble element, or in nanoemulsions.