Straightforward synthesis of functionalized γ-Lactams using impure CO₂ stream as the carbon source

Area of Science:

• Organic Synthesis
• Green Chemistry
• Carbon Capture and Utilization (CCU)

Background:

• Direct CO2 utilization in organic synthesis is crucial for pharmaceuticals and fine chemicals.
• Purifying CO2 is energy-intensive and costly, hindering its widespread application.
• Gamma-lactams are vital structural motifs in many bioactive molecules.

Purpose of the Study:

• To develop a straightforward synthetic route for gamma-lactams.
• To utilize impure CO2 streams (e.g., car exhaust) as a direct carbon source.
• To enable sustainable synthesis of functionalized gamma-lactams.

Main Methods:

• Employed commercially available alkenes and amines as starting materials.
• Utilized impure CO2 gas directly, bypassing purification steps.
• Developed a catalytic system for the direct synthesis of gamma-lactams.

Main Results:

• Successfully synthesized various functionalized gamma-lactams.
• Demonstrated broad scope and excellent functional group compatibility.
• Applied the method to late-stage functionalization of pharmaceuticals and natural products.

Conclusions:

• The developed strategy offers a sustainable and cost-effective route to gamma-lactams.
• This approach enhances the viability of Carbon Capture and Utilization (CCU) strategies.
• Provides direct access to valuable gamma-lactam structures from readily available materials and waste CO2.