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Published on: November 30, 2022
Cobalt-Catalyzed C(sp2)-C(sp3) Suzuki-Miyaura Cross Coupling
Jacob R Ludwig1, Eric M Simmons2, Steven R Wisniewski2
1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.
A new cobalt-catalyzed Suzuki-Miyaura coupling method enables C(sp2)-C(sp3) bond formation between aryl boronic esters and alkyl bromides. This efficient reaction offers broad scope for diverse substrates, advancing organic synthesis.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Suzuki-Miyaura cross-coupling is a cornerstone of C-C bond formation.
- C(sp3) coupling partners remain challenging substrates in cross-coupling reactions.
- Development of efficient catalytic systems for C(sp2)-C(sp3) coupling is highly desirable.
Purpose of the Study:
- To develop a novel cobalt-catalyzed method for C(sp2)-C(sp3) Suzuki-Miyaura cross-coupling.
- To identify optimal cobalt-ligand combinations for this transformation.
- To explore the scope and limitations of the developed methodology.
Main Methods:
- High-throughput experimentation was employed to screen cobalt-ligand combinations.
- The reaction involved aryl boronic esters and alkyl bromides as coupling partners.
- Radical trap experiments were utilized to investigate the reaction mechanism.
Main Results:
- An effective catalytic system using cobalt(II) with trans-N,N'-dimethylcyclohexane-1,2-diamine (DMCyDA) was identified.
- The method demonstrated high yield and selectivity for the C(sp2)-C(sp3) coupling.
- The transformation accommodated diverse aryl boronate nucleophiles and functionalized alkyl bromide electrophiles.
Conclusions:
- A robust cobalt-catalyzed C(sp2)-C(sp3) Suzuki-Miyaura cross-coupling has been established.
- The reaction proceeds with broad substrate scope, including sterically hindered and functionalized substrates.
- Evidence suggests a radical-based mechanism involving electrophile-derived radicals.
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