Development and optimization of a new synthetic process for lorcaserin

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Lorcaserin is a medication used for weight management.
• Efficient synthesis and enantiomeric resolution are crucial for pharmaceutical production.

Purpose of the Study:

• To develop a streamlined synthesis for racemic lorcaserin.
• To implement a method for racemizing and recycling the undesired enantiomer to improve R-lorcaserin yield.

Main Methods:

• Synthesis of racemic lorcaserin from 2-(4-chlorophenyl)ethanol via bromide or tosylate derivatives.
• Reaction with allylamine followed by cyclization using aluminum or zinc chloride.
• Resolution of enantiomers and racemization of the unwanted enantiomer for recycling.

Main Results:

• A two-step synthesis yielding racemic lorcaserin was successfully developed.
• The process allows for the recovery and recycling of the undesired enantiomer.
• This recycling strategy enhances the overall production efficiency of R-lorcaserin.

Conclusions:

• The developed synthetic route is efficient for producing racemic lorcaserin.
• The integrated racemization and recycling process significantly improves the yield of the desired R-enantiomer.
• This optimized synthesis offers a practical approach for the large-scale production of R-lorcaserin.