Easy Access to Aliphatic Sulfonamides using Sulfamoyl Chlorides Under Visible Light Activation

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Photocatalysis

Background:

• Sulfonamides are crucial structural motifs in pharmaceuticals and natural products.
• Existing synthetic routes often lack efficiency or one-step methodologies for specific sulfonamide structures.
• There is a need for practical, scalable, and versatile methods for sulfonamide synthesis.

Purpose of the Study:

• To develop a facile and efficient one-step method for synthesizing alkyl-flanked sulfonamides.
• To explore the use of sulfamoyl chlorides as radical precursors under photocatalytic conditions.
• To provide a practical protocol applicable to late-stage functionalization in drug discovery.

Main Methods:

• Net hydrosulfamoylation of electron-deficient alkenes using sulfamoyl chlorides.
• Blue-light activation mediated by the metal-free photocatalyst Eosin Y.
• A scalable reaction with broad functional group tolerance and simple purification.

Main Results:

• Successful synthesis of alkyl-flanked sulfonamides via a one-step protocol.
• Demonstration of a cost-effective, metal-free photocatalytic approach.
• The methodology is scalable and suitable for late-stage functionalization of complex molecules.

Conclusions:

• The developed protocol offers a practical and convenient route to valuable alkyl-flanked sulfonamides.
• This metal-free, light-driven synthesis is highly applicable to electron-deficient alkenes.
• The method's efficiency, scalability, and functional group tolerance make it attractive for pharmaceutical research.