Parallel protocol for the selective methylation and alkylation of primary amines

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• A significant challenge in parallel synthesis is the lack of general and rapid methods for primary amine to secondary amine conversion, often complicated by polyalkylation.
• Existing methods may not be suitable for high-throughput or parallel synthesis applications.

Purpose of the Study:

• To develop a robust and general protocol for the selective synthesis of secondary amines from primary amines.
• To adapt the Fukuyama method for efficient parallel synthesis using supported reagents and scavengers.
• To demonstrate the preparation of diverse secondary and tertiary amines using the developed protocol.

Main Methods:

• Adaptation of the Fukuyama method involving alkylation of o-nitrobenzenesulfonamides.
• Utilizing supported reagents and scavengers for simplified purification and parallel processing.
• Sequential reactions in a single pot to synthesize tertiary amines from primary amines.

Main Results:

• A simple and rapid protocol for the selective synthesis of secondary amines was established.
• The method proved robust, with a representative array of secondary amines successfully prepared.
• The protocol was extended to synthesize various substituted tertiary amines by using different supported reagents in the same pot.

Conclusions:

• The developed method offers an efficient solution for secondary and tertiary amine synthesis in parallel synthesis.
• The use of supported reagents and scavengers enhances the applicability and ease of the protocol.
• This approach addresses the challenge of polyalkylation in amine synthesis, providing a valuable tool for drug discovery and development.