Tertiary cyclopropyl carbagermatranes: synthesis and cross-coupling

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• The synthesis of cyclopropyl quaternary carbon centers is crucial for developing 1,1-olefin bioisosteres.
• Existing methods for constructing these centers can be limited in scope or efficiency.

Purpose of the Study:

• To report a novel class of compounds, tertiary cyclopropyl carbagermatranes, as versatile synthons.
• To demonstrate their utility in palladium-catalyzed cross-coupling reactions and with boron reagents.
• To establish their role in synthesizing tertiary cyclopropanes and quaternary centers.

Main Methods:

• Zinc-mediated decarboxylation of NHP esters to form tertiary cyclopropyl carbagermatranes.
• Palladium-catalyzed cross-coupling reactions utilizing these carbagermatranes as nucleophiles.
• Reactions with boron reagents to showcase orthogonal reactivity.

Main Results:

• Tertiary cyclopropyl carbagermatranes were successfully synthesized via a straightforward zinc-mediated decarboxylation.
• These carbagermatranes demonstrated efficient reactivity in palladium-catalyzed cross-coupling reactions.
• Orthogonal reactivity with boron reagents was observed, highlighting their versatility.
• The compounds proved to be robust nucleophiles for constructing tertiary cyclopropane structures.
• They served as efficient intermediates for the formation of quaternary carbon centers.

Conclusions:

• Tertiary cyclopropyl carbagermatranes are readily accessible and highly reactive building blocks.
• They offer a powerful strategy for the synthesis of diverse tertiary cyclopropane derivatives.
• Their application facilitates the construction of quaternary centers, important motifs in drug discovery.