Direct Organocatalytic Enantioselective Functionalization of SiO_x Surfaces

Area of Science:

• Organic Chemistry
• Surface Science
• Materials Science

Background:

• Chiral surfaces are traditionally prepared via molecule adsorption or template-assisted ordering.
• Limited alternative strategies exist for creating well-defined chiral surfaces.

Purpose of the Study:

• To develop a novel "bottom-up" approach for preparing chiral surfaces.
• To achieve direct enantioselective organocatalytic reactions on functionalized surfaces.

Main Methods:

• Utilized a silicon oxide supported self-assembled monolayer (SAM) functionalized with a reactive trifluoroenone.
• Employed a homogeneous isothiourea catalyst for an enantioselective Michael-lactonization.
• Applied chiral atomic force microscopy (χ-AFM) to characterize enantiomeric enrichment.

Main Results:

• Successfully prepared enantiomerically enriched organic surfaces via direct organocatalysis.
• Demonstrated efficient catalytic generation of chiral surfaces.
• Quantified enantiomeric enrichment using χ-AFM force measurements.

Conclusions:

• The developed "bottom-up" strategy offers an effective alternative for chiral surface preparation.
• Enantioselective organocatalysis provides a direct route to functionalized chiral surfaces.
• χ-AFM is a suitable technique for probing chiral surface properties.