Structurally Diverse Acyl Bicyclobutanes: Valuable Strained Electrophiles

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Bicyclo[1.1.0]butanes (BCBs) are strained carbocycles with significant synthetic potential.
• BCBs are valuable building blocks for constructing functionalized small molecules.

Purpose of the Study:

• To develop efficient synthetic routes for diverse bicyclo[1.1.0]butane (BCB) ketones.
• To expand the accessibility of novel BCB derivatives, including amino acid and dipeptide analogues.

Main Methods:

• Two-step synthesis from simple carboxylic acids.
• Unsymmetrical ketone synthesis utilizing a carbonyl dication equivalent.

Main Results:

• Preparation of over 20 structurally diverse BCB ketones.
• Synthesis of unprecedented amino acid, dipeptide, bioisostere, and bifunctional linchpin reagents.
• High yields and rapid synthesis of analogues.

Conclusions:

• Established efficient pathways for novel BCB ketone synthesis.
• Demonstrated the utility of these strained electrophiles for selective protein modification.