Chiral Cyclodecynes for Copper-Free Click Chemistry
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Solution Overview
Problem
Click chemistry methods, such as Cu-catalyzed alkyne-azide cycloaddition, face limitations due to copper toxicity and instability of strain-activated cycloalkynes, which complicates synthesis and applications, particularly in bioorthogonal and surface chemistry, where reactivity and stability are crucial.
Innovation Solution
The development of chiral cyclodecynes with a twisted and bent structural motif, formed by reacting a 1,1′-biaryl compound with a protected but-2-yne-1,4-diol, introduces axial chirality and enhances reactivity towards azides, potentially surpassing the reactivity of activated cyclononynes and approaching that of cyclooctynes, through stereoelectronic effects and geometric constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If strain-activated cycloalkynes are used to eliminate copper toxicity, then biocompatibility is improved, but instability and synthesis complexity increase
Solution Approach 1:
The patent changes the ring size parameter from 8-membered (cyclooctyne) or 9-membered (cyclononyne) to 10-membered (cyclodecyne), which reduces ring strain and improves stability while maintaining adequate reactivity for bioorthogonal chemistry applications
Solution Approach 2:
The patent combines a cyclodecyne core with biaryl moieties and various functional groups to create composite molecular structures that maintain stability while enabling diverse applications in bioorthogonal chemistry and materials science
2Productivity
If smaller cycloalkynes (cyclooctyne, cyclononyne) are used to increase reactivity, then click chemistry reactivity is improved, but synthesis difficulty and instability increase
Solution Approach 1:
The patent optimizes the ring size parameter to 10 members, finding the optimal balance between reactivity and synthesis feasibility. The 10-membered ring can be synthesized via direct nucleophilic substitution without requiring the Nicholas reaction, simplifying the synthetic route while maintaining adequate reactivity
Solution Approach 2:
The patent extracts the essential reactivity requirement from smaller cycloalkynes and achieves it through strategic placement of electron-withdrawing groups on the 10-membered ring, eliminating the need for complex protection-deprotection sequences required for smaller rings
3Device complexity
If direct nucleophilic substitution is used to synthesize cyclodecynes, then synthesis steps are reduced, but reaction efficiency decreases due to entropic and enthalpic penalties
Solution Approach 1:
The patent introduces electron-withdrawing groups at specific positions on the cyclodecyne ring to locally enhance electrophilicity, compensating for the inherent entropic and enthalpic penalties of direct nucleophilic substitution and improving reaction efficiency without adding synthesis steps
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 chiral cyclodecynes exhibit increased reactivity and stability, enabling efficient click cycloadditions with azides, overcoming the limitations of previous methods by leveraging remote electronic effects and stereoelectronic interactions, and are scalable to a gram scale with enantiopure purity.
Implementation Method 1
Strain-promoted alkyne-azide cycloaddition has been shown to address one or more of these limitations in bioorthogonal chemistry and surface chemistry
Implementation Method 2
The structural design of cycloalkynes in click chemistry include alkyne bending, sometimes amplified by one or more other external factors
Implementation Method 3
The twisted cyclodecynes were intertwined with dormant electronic effects that may open a conceptually new way to control click reactivity
Data Source
AI summary
Provided herein are cyclodecynes, including chiral cyclodecynes, and methods of making cyclodecynes. The methods may include providing a 1,1′-biaryl compound substituted independently at the 2-position and the 2′-position with a hydroxyl or an amino group; and contacting the 1,1′-biaryl compound with a protected but-2-yne-1,4-diol to form the cyclodecyne.