Formal Carbon-Atom Insertion of Primary Aliphatic Amines

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Primary aliphatic amines, including amino acids, are crucial in bioactive compounds but difficult to modify via simple chain extension.
• Existing methods for carbon-atom insertion into amines are limited, hindering the synthesis of complex molecules.

Purpose of the Study:

• To develop a general and iterative strategy for formal one-carbon insertion into primary aliphatic amines.
• To provide a versatile method for carbon-chain growth and functionalization of amine-containing molecules.

Main Methods:

• In situ generation of triazanium intermediates from O-diphenylphosphinyl hydroxylamine.
• Rearrangement to alkyl radical species, followed by interception with aldoxime or ketoxime acceptors.
• Reductive conversion of the resulting oxime ethers to diverse sp3-carbon frameworks.

Main Results:

• Successful formal one-carbon insertion into primary aliphatic amines.
• Demonstrated iterative one-carbon homologation and access to diverse sp3-carbon frameworks.
• The method shows broad functional-group tolerance and mild reaction conditions.

Conclusions:

• This strategy offers a powerful tool for molecular editing and carbon-chain expansion of primary amines.
• The method is applicable to late-stage modification of bioactive compounds, facilitating drug discovery and development.