Efficiency in chemistry: from hydrogen autotransfer to multicomponent catalysis

Area of Science:

• Organic Chemistry
• Catalysis
• Green Chemistry

Background:

• Developing efficient and sustainable synthetic methodologies is crucial in organic chemistry.
• Traditional methods for α-alkylation of ketones and synthesis of polyfunctionalized molecules often involve harsh conditions or generate significant waste.
• There is a need for atom-economical and environmentally benign synthetic routes.

Purpose of the Study:

• To explore the application of hydrogen autotransfer reaction for the α-alkylation of ketones using primary alcohols.
• To investigate the synthesis of diverse polyfunctionalized molecules via multicomponent reactions.
• To evaluate both homogeneous and heterogeneous catalytic systems for efficiency and environmental impact.

Main Methods:

• Hydrogen autotransfer reaction for α-alkylation of ketones using primary alcohols under homogeneous (Ru complex) and heterogeneous (Ni nanoparticles) catalysis.
• Three distinct multicomponent reactions: Strecker reaction (uncatalyzed), aza-Sakurai process (ferrite-catalyzed), and addition of Zn enolates to chiral sulfinylimines (Cu-catalyzed).

Main Results:

• The hydrogen autotransfer reaction demonstrated high efficiency and atom economy, producing only water as a byproduct.
• The three multicomponent reactions successfully generated a wide variety of polyfunctionalized molecules.
• Both homogeneous and heterogeneous catalytic approaches proved effective for the α-alkylation.

Conclusions:

• Hydrogen autotransfer offers an efficient and green approach for ketone α-alkylation.
• Multicomponent reactions provide versatile pathways to complex molecular architectures.
• The developed methods contribute to sustainable synthesis in organic chemistry.