Solvated electron-driven hydroamination of olefins

Area of Science:

• Organic Chemistry
• Sustainable Chemistry

Background:

• Hydroamination reactions are crucial for synthesizing amines.
• Traditional methods often rely on transition metals, posing sustainability concerns.

Purpose of the Study:

• To develop a novel, transition metal-free hydroamination protocol.
• To utilize solvated electrons for efficient C-N bond formation.

Main Methods:

• Employing solvated electrons generated *in situ* from lithium metal under sonication in 2-methyltetrahydrofuran (2-MeTHF).
• Utilizing an additive-free protocol for intermolecular hydroamination of various olefins.

Main Results:

• Rapid formation of secondary and tertiary amines under ambient conditions.
• Broad applicability to vinylarenes, alkyl amines, allylarenes, and conjugated dienes.
• Demonstrated distinct regioselectivity with specific substrates.

Conclusions:

• The developed method is a sustainable and atom-economical alternative to metal-catalyzed hydroamination.
• Lithium amide intermediates play a dual role as reductants and nucleophiles.
• The protocol is synthetically useful, enabling efficient synthesis of valuable compounds like benzphetamine.