Multi-step polymer-assisted solution-phase (PASP) library synthesis of functionalized diaminobenzamides

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• Library synthesis is crucial for drug discovery and materials science.
• Developing efficient and high-yielding synthetic routes is essential for creating diverse compound libraries.
• Polymer-assisted solution-phase (PASP) techniques offer advantages in purification and reaction control.

Purpose of the Study:

• To describe a novel four-step parallel solution-phase library synthesis of functionalized diaminobenzamides.
• To demonstrate the utility of polymer-assisted solution-phase (PASP) techniques in a multi-step sequence.
• To achieve high overall purity in the synthesized compound library.

Main Methods:

• Utilized polymer-assisted solution-phase (PASP) synthesis techniques for a four-step library synthesis.
• Employed sequestering resins for reactant and by-product removal.
• Incorporated a resin capture/release strategy for purification.
• Introduced diversity at two positions via amine coupling and fluoro-group displacement.
• Performed parallel reduction of nitro groups to amines.

Main Results:

• Achieved a high-yielding, multi-step sequence for diaminobenzamide synthesis.
• Demonstrated efficient purification using sequestering resins and a capture/release strategy.
• Generated functionalized diaminobenzamides with high overall purities averaging 80% over the four-step sequence.
• Successfully introduced two points of diversity within the synthesized library.

Conclusions:

• The described PASP approach provides an efficient and robust method for parallel library synthesis of functionalized diaminobenzamides.
• The use of polymer-assisted techniques and resin-based purification simplifies the process and enhances purity.
• This methodology is well-suited for generating diverse compound libraries for screening in drug discovery and other applications.