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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Published on: September 18, 2016

Strained Dehydro-[2,2]-paracyclophane Enabled Planar Chirality Construction and [2.2]Paracyclophane

Xue Zhang¹, Yi Zhou², Zhi-Xiang Yu²

¹School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China.

Angewandte Chemie (International Ed. in English)

|January 13, 2025

Summary

Synthesizing planar chiral [2.2]paracyclophanes (PCPs) is now efficient using asymmetric copper(I) catalysis. This method provides valuable chiral building blocks and heterocycles with high enantioselectivity.

Keywords:

Asymmetric catalysis benzyne enantioconvergent reaction paracyclophane planar chirality

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Area of Science:

Organic Chemistry
Materials Science
Asymmetric Catalysis

Background:

Planar chiral compounds, particularly [2.2]paracyclophanes (PCPs), are vital in chemistry, optics, and materials science due to their unique properties.
PCPs are utilized in advanced applications like π-stacking polymers, organic luminescent materials, and as chiral ligands or organocatalysts.
Existing methods for synthesizing chiral PCPs, such as chromatography or resolution, are often inefficient or challenging.

Purpose of the Study:

To develop a novel and efficient method for synthesizing enantiomerically pure planar chiral [2.2]paracyclophane derivatives.
To establish a practical route for accessing strained dehydro-[2.2]-paracyclophane intermediates.
To explore the utility of these intermediates in synthesizing diverse functionalized PCPs.

Main Methods:

An enantioconvergent alkynylation reaction using an in situ-generated dehydro-[2.2]-paracyclophane intermediate.
Asymmetric copper(I) catalysis to control the stereochemical outcome of the reaction.
Density Functional Theory (DFT) calculations to elucidate the mechanism and understand enantioselectivity.

Main Results:

The developed method efficiently synthesizes valuable planar chiral PCP building blocks and heterocycles.
The reaction proceeds with good yields and excellent enantioselectivity.
A practical route to strained dehydro-[2.2]-paracyclophane intermediates was established, enabling further synthetic transformations.

Conclusions:

Asymmetric copper(I)-catalyzed alkynylation offers a powerful new strategy for accessing chiral PCPs.
The developed methodology overcomes limitations of previous synthetic approaches.
The strained intermediates generated are versatile synthons for creating diverse functionalized planar chiral compounds.