Catalytic stereodivergent functionalization of H2@C60

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Fullerene Chemistry

Background:

• Endohedral fullerenes, such as H2@C60, present unique structural and electronic properties.
• 1,3-Dipolar cycloaddition reactions are versatile tools for constructing cyclic molecules.
• Controlling stereochemistry in reactions involving fullerenes is challenging.

Purpose of the Study:

• To report the first complete stereocontrol of 1,3-dipolar cycloaddition onto endohedral fullerene H2@C60.
• To achieve stereodivergent synthesis of cis and trans endohedral cycloadducts.
• To obtain high diastereoselectivity and enantioselectivity in these cycloaddition reactions.

Main Methods:

• Utilizing N-metalated azomethine ylides as 1,3-dipoles.
• Employing endohedral fullerene H2@C60 as the dipolarophile.
• Developing reaction conditions to control the stereochemical outcome (cis vs. trans).

Main Results:

• Demonstrated complete stereocontrol in the cycloaddition reaction.
• Achieved stereodivergent synthesis, yielding either cis or trans cycloadducts.
• Obtained excellent diastereoselectivity and enantioselectivity for both stereoisomers.

Conclusions:

• The study establishes a novel method for stereocontrolled functionalization of endohedral fullerenes.
• This work opens avenues for synthesizing complex fullerene derivatives with defined stereochemistry.
• The developed methodology is crucial for applications requiring precise molecular architectures.