Continuous Flow Synthesis of Nitrofuran Pharmaceuticals Using Acetyl Nitrate

Area of Science:

• Organic Chemistry
• Chemical Engineering
• Pharmaceutical Synthesis

Background:

• Nitrofurfural is essential for synthesizing antimicrobial nitrofuran drugs.
• Traditional furfural nitration methods use harsh conditions, leading to low yields and poor reproducibility.
• Existing methods for acetyl nitrate, a milder nitrating agent, are incompatible with furfural and pose safety risks.

Purpose of the Study:

• To develop a safe and robust continuous flow platform for the nitration of furfural.
• To address the limitations of conventional acetyl nitrate preparation and its associated safety concerns.
• To enable efficient synthesis of nitrofurfural and related pharmaceutical intermediates.

Main Methods:

• In situ generation of acetyl nitrate within a continuous flow reactor.
• Automated and integrated platform for remote process operation.
• Nitration of furfural to nitrofurfural using the developed flow system.

Main Results:

• Successful synthesis of nitrofurfural with high reproducibility and favorable metrics.
• Demonstrated efficiency in producing various best-selling nitrofuran pharmaceuticals, including nifuroxazide, nifurtimox, nitrofurantoin, and nitrofural.
• Achieved excellent isolated yields for target compounds in under five minutes.

Conclusions:

• The developed continuous flow platform offers a safe, efficient, and robust method for synthesizing nitrofurfural.
• This approach overcomes the challenges associated with traditional nitration methods and acetyl nitrate preparation.
• The platform facilitates the streamlined production of vital nitrofuran-based active pharmaceutical ingredients.