Functionalized Contorted Polycyclic Aromatic Hydrocarbons by a One-Step Cyclopentannulation and Regioselective...

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Materials Science

Background:

• The Scholl reaction is a key method for synthesizing polycyclic aromatic hydrocarbons (PAHs) through oxidative cyclodehydrogenation.
• While selective, Scholl reactions can yield unexpected products like five-membered rings or rearranged aryl groups.
• Direct functionalization of PAHs during Scholl cyclization, particularly triflyloxylation, has not been previously reported.

Purpose of the Study:

• To develop a novel, one-step method for synthesizing functionalized PAHs.
• To achieve regioselective triflyloxylation concurrently with five-membered ring formation in Scholl-type reactions.
• To create new triflyloxylated PAH building blocks for constructing larger, complex PAH architectures.

Main Methods:

• Utilized a modified Scholl-type reaction for oxidative cyclodehydrogenation.
• Introduced triflyloxylation as a direct functionalization pathway during the cyclization process.
• Characterized the resulting functionalized polycyclic aromatic hydrocarbons.

Main Results:

• Successfully synthesized functionalized PAHs through a one-step process.
• Achieved simultaneous five-membered ring formation and regioselective triflyloxylation.
• Demonstrated the utility of the synthesized triflyloxylated PAHs for further elaboration into larger contorted PAHs.

Conclusions:

• The developed method offers a novel approach to PAH functionalization.
• This one-step triflyloxylation during Scholl cyclization provides access to valuable intermediates.
• The synthesized compounds serve as versatile precursors for advanced materials and complex molecular architectures.