Carbonyl cross-metathesis via deoxygenative gem-di-metal catalysis

Area of Science:

• Organic Chemistry
• Synthetic Methodology
• Catalysis

Background:

• Carbonyls and alkenes are fundamental functional groups in organic synthesis.
• Existing cross-metathesis methods lack efficient strategies for deoxygenative coupling of two carbonyl compounds.

Purpose of the Study:

• To develop novel catalytic methods for the cross-metathesis of unbiased carbonyl compounds.
• To enable the selective formation of alkenes from aldehydes and ketones.

Main Methods:

• Development of two distinct catalytic strategies using earth-abundant metal salts (Iron and Chromium).
• Utilizing transiently generated carbenes/ylides (Fe) or gem-di-metallics (Cr) to facilitate the reaction.

Main Results:

• Achieved chemo- and stereoselective cross-metathesis of aldehydes with aldehydes or ketones.
• Enabled rapid access to a broad range of Z- or E-alkenes under mild conditions.
• Demonstrated two distinct catalytic mechanisms involving iron and chromium.

Conclusions:

• The reported methods provide a significant advancement in carbonyl chemistry and alkene synthesis.
• These catalytic strategies offer versatile and efficient routes to diverse alkene structures.
• The use of earth-abundant metals makes these methods attractive for broader synthetic applications.