A one pot protocol to convert nitro-arenes into N-aryl amides

Area of Science:

• Organic Synthesis
• Medicinal Chemistry
• Green Chemistry

Background:

• Nitro-arenes are common precursors in organic synthesis.
• Efficient methods for converting nitro-arenes to N-aryl amides are crucial for pharmaceutical development.
• Existing methods often involve expensive or toxic metal catalysts.

Purpose of the Study:

• To develop a simple, metal-free, and cost-effective protocol for synthesizing N-aryl amides from nitro-arenes.
• To explore the utility of the developed method in generating functionalized intermediates for pharmaceutical applications.

Main Methods:

• A two-step, one-pot procedure involving metal-free reduction of the nitro group using trichlorosilane.
• Subsequent reaction with anhydrides or gamma-butyrolactone to form N-aryl carboxamides or N-aryl butanamides.
• Isolation of products via simple aqueous workup.

Main Results:

• Successful conversion of nitro-arenes to N-aryl amides in good to excellent yields.
• Synthesis of a gamma-chloro-N-aryl butanamide derivative from gamma-butyrolactone, a versatile synthetic handle.
• Demonstrated utility of the synthesized intermediate in the preparation of pharmaceutically active compounds.

Conclusions:

• The developed protocol offers an efficient, environmentally benign, and scalable route to N-aryl amides.
• The method provides access to valuable, functionalized intermediates for drug discovery and development.
• This approach represents a significant advancement in metal-free synthetic strategies for amide synthesis.