Deconstructive Functionalizations of Unstrained Carbon-Nitrogen Cleavage Enabled by Difluorocarbene

Area of Science:

• Organic Chemistry
• Fluorine Chemistry
• Carbene Chemistry

Background:

• Transition-metal or oxidant-promoted C-N bond functionalizations are common but often leave only one part of the molecule modified.
• Simultaneous C- and N-functionalization of unstrained C(sp3)-N bonds without metals or oxidants is rare, limiting versatility and product diversity.

Purpose of the Study:

• To develop a novel method for simultaneous C- and N-functionalization of cyclic amines.
• To achieve this under transition-metal-free and oxidant-free conditions.
• To enable access to diverse molecular structures from readily available starting materials.

Main Methods:

• Utilizing difluorocarbene to induce deconstructive functionalization of cyclic amines.
• Employing successive C(sp3)-N bond cleavage.
• Synchronous functionalization of both cleaved C-N bond constituents.

Main Results:

• The first reported difluorocarbene-induced deconstructive functionalization of cyclic amines under metal- and oxidant-free conditions.
• Successful synthesis of functionalized products retaining both original C-N bond moieties.
• Demonstrated access to deuterated formamides with high isotopic incorporation using heavy water.

Conclusions:

• This strategy offers a convenient, operationally simple, and novel route to molecular diversity.
• The method is applicable to fluorine chemistry, carbene chemistry, C-N bond activation, and medicinal chemistry.
• The ability to incorporate isotopes makes it valuable for pharmaceutical sciences.