Integrating Allyl Electrophiles into Nickel-Catalyzed Conjunctive Cross-Coupling

Area of Science:

• Catalysis
• Organic Synthesis
• Organometallic Chemistry

Background:

• Allylation and conjunctive cross-coupling are distinct catalytic processes.
• Combining these reactions offers significant potential for novel organic synthesis.

Purpose of the Study:

• To develop a nickel-catalyzed method for conjunctive cross-coupling of allyl electrophiles with non-conjugated alkenes.
• To explore the use of directing groups in facilitating this combined reactivity.

Main Methods:

• Utilized nickel catalysis with allyl electrophiles and dimethylzinc.
• Employed weakly coordinating, monodentate aza-heterocycle directing groups (e.g., saccharin, pyridones).
• Investigated reaction conditions, substrate scope, and mechanistic pathways.

Main Results:

• Achieved successful conjunctive cross-coupling under mild conditions.
• Demonstrated high chemoselectivity via substrate directivity, preserving specific alkene functionalities.
• Extended the methodology to alkyne substrates, showcasing its generality.

Conclusions:

• The developed method effectively merges allylation and conjunctive cross-coupling.
• Weakly coordinating directing groups are crucial for enabling the catalytic cycle.
• This approach provides a versatile tool for constructing complex organic molecules.