Development of a Large-Scale Cyanation Process Using Continuous Flow Chemistry En Route to the Synthesis of...

Area of Science:

• Organic Chemistry
• Process Chemistry
• Medicinal Chemistry

Background:

• Cyanation reactions at manufacturing scales present significant safety and control challenges due to hazardous reagents and strict parameter requirements (e.g., cryogenic temperatures).
• Traditional batch processing equipment struggles to manage the risks and precise conditions needed for efficient and selective cyanation.
• Continuous flow chemistry offers a promising alternative for handling hazardous reactions and improving process control.

Purpose of the Study:

• To demonstrate the application of continuous flow chemistry for large-scale cyanation reactions.
• To present a case study on the synthesis of the drug candidate remdesivir using flow cyanation.
• To highlight the advantages of flow chemistry in mitigating risks and enhancing control over hazardous reactions.

Main Methods:

• Implementation of cyanation chemistry using continuous flow reactor systems.
• Optimization of reaction parameters within the flow setup for selectivity and conversion.
• Case study involving the cyanation of a glycoside intermediate for remdesivir synthesis.

Main Results:

• Continuous flow processing successfully mitigated risks associated with handling hazardous cyanation reagents.
• Enhanced control over reaction parameters, including temperature, was achieved in the flow system.
• The cyanation of the glycoside intermediate proceeded with acceptable selectivity and conversion, enabling remdesivir synthesis.

Conclusions:

• Continuous flow chemistry provides a safer and more controllable alternative to batch processing for industrial-scale cyanation.
• The successful synthesis of a remdesivir intermediate showcases the practical utility of flow cyanation.
• This approach enhances process safety and efficiency in pharmaceutical manufacturing.