A Process Chemistry Benchmark for sp²-sp³ Cross Couplings

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Process Chemistry

Background:

• The sp2-sp3 disconnection motif is increasingly utilized in drug discovery.
• Novel direct methodologies for forging sp2-sp3 bonds are crucial for pharmaceutical development.
• Scalable processes are essential for large-scale clinical supply delivery in process chemistry.

Purpose of the Study:

• To apply and optimize various standard, photo-, and electrochemical sp2-sp3 cross-coupling methods.
• To evaluate these novel methods against traditional two-step palladium-catalyzed processes.
• To identify trends and similarities among sp2-sp3 bond-forming methods for future refinement.

Main Methods:

• Application of diverse sp2-sp3 cross-coupling reactions (standard, photochemical, electrochemical).
• Optimization using high-throughput experimentation and mechanistically guided approaches.
• Comparative analysis against a two-step palladium-catalyzed process.

Main Results:

• Successful application and optimization of multiple sp2-sp3 cross-coupling methodologies.
• Detailed performance data, benefits, and limitations were gathered for each method.
• Comparison provided insights into the efficacy of novel methods versus traditional approaches.

Conclusions:

• The study reveals key trends and commonalities across different sp2-sp3 bond-forming strategies.
• Findings suggest a clear path for refining and advancing these critical synthetic methods.
• This work aids in selecting optimal cross-coupling techniques for pharmaceutical intermediate synthesis.