Towards a continuous dynamic kinetic resolution of 1-phenylethylamine using a membrane assisted, two vessel process

Area of Science:

• Biocatalysis and Chemical Engineering
• Organic Synthesis

Background:

• Dynamic kinetic resolution (DKR) reactions often face challenges when combining multiple catalysts.
• Integrating biocatalysts with racemization catalysts requires careful control of reaction conditions to maintain activity.

Purpose of the Study:

• To develop a continuous process for dynamic kinetic resolution that overcomes catalyst compatibility issues.
• To enhance the stability and efficiency of biocatalysts in DKR reactions.

Main Methods:

• A two-vessel continuous flow system was designed.
• A microfiltration membrane was employed to immobilize the biocatalyst in a low-temperature vessel.
• Racemization occurred in a separate, higher-temperature vessel.

Main Results:

• The continuous process successfully separated the biocatalyst from the racemization catalyst.
• Biocatalyst stability was maintained at lower temperatures, while efficient racemization occurred at higher temperatures.
• This approach addresses problems associated with combining catalysts in DKR.

Conclusions:

• The developed two-vessel continuous process offers an effective solution for dynamic kinetic resolution.
• Separating catalysts improves biocatalyst retention and allows for optimized racemization conditions.
• This method enhances the overall efficiency and applicability of DKR reactions.