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Nucleophilic Aromatic Substitution: Elimination–Addition

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Strategy for Conditional Orthogonal Sequential CuAAC Reactions Using a Protected Aromatic Ynamine.

Marine Z C Hatit¹, Ciaran P Seath¹, Allan J B Watson¹

¹Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde , Glasgow G1 1XL, U.K.

The Journal of Organic Chemistry

|April 29, 2017

Summary

This summary is machine-generated.

This study introduces a novel method for controlling sequential copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions. A silyl protecting group enables selective reactions with different alkynes, offering precise control in complex molecular systems.

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Area of Science:

Organic Chemistry
Catalysis
Synthetic Methodology

Background:

Copper-catalyzed azide-alkyne cycloaddition (CuAAC) is a cornerstone of click chemistry.
Controlling sequential CuAAC reactions in systems with multiple reactive sites remains a challenge.
Aromatic ynamines offer unique reactivity but require careful management for selective transformations.

Purpose of the Study:

To develop a method for conditional and orthogonal control of sequential CuAAC reactions.
To enable selective ligation in complex multialkyne and multi-azide systems.
To provide a unifying strategy for chemoselective CuAAC reactions.

Main Methods:

Utilizing a silyl protecting group to modulate the reactivity of aromatic ynamines.
Implementing in situ silyl deprotection to trigger subsequent CuAAC reactions.
Applying the developed method to dialkyne systems for orthogonal sequential reactions.

Main Results:

Demonstrated selective CuAAC reaction of less reactive alkynes using protected ynamines.
Achieved selective CuAAC reaction of the protected ynamine via in situ deprotection.
Established complete orthogonal control over sequential CuAAC reactions in dialkyne systems.

Conclusions:

The developed method offers precise conditional control over sequential CuAAC reactions.
This strategy provides a unifying approach for chemoselective ligations in complex systems.
The use of silyl protecting groups on ynamines enhances synthetic versatility in click chemistry.