Copper-Catalyzed Racemization-Recycle of a Quaternary Center and Optimization Using a Combined Kinetics-DoE/MLR...

Area of Science:

• Organic Chemistry
• Chemical Engineering
• Process Chemistry

Background:

• Lanabecestat is an investigational drug targeting amyloid precursor protein (APP) processing.
• Efficient synthesis of complex pharmaceutical intermediates is crucial for drug development.
• Copper-catalyzed reactions offer versatile synthetic routes in organic chemistry.

Purpose of the Study:

• To optimize the copper-catalyzed racemization of a complex quaternary center.
• To achieve mechanistic understanding of the racemization process.
• To improve the synthesis of a key lanabecestat intermediate.

Main Methods:

• Utilized a combined kinetic-multiple linear regression approach.
• Employed a definitive screening design with mechanistically relevant factors.
• Integrated fitted kinetic descriptors and empirical measurements for predictive modeling.

Main Results:

• Developed a synergistic model accurately predicting complex reaction time course behavior.
• Minimized the formation of dimer byproducts.
• Identified optimal batch operating conditions and beneficial superheated flow conditions.

Conclusions:

• The developed kinetic model effectively guided process optimization.
• Achieved significant improvements in yield and purity for the lanabecestat intermediate.
• Demonstrated the utility of integrated experimental design and kinetic modeling for complex chemical processes.