Chemoselective Synthesis of Lenalidomide-Based PROTAC Library Using Alkylation Reaction

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Chemical Biology

Background:

• Lenalidomide is a crucial immunomodulatory drug with applications in cancer therapy.
• Developing novel drug conjugates like Proteolysis-Targeting Chimeras (PROTACs) is key for targeted cancer treatment.
• Efficient synthesis of functionalized drug scaffolds is essential for PROTAC library development.

Purpose of the Study:

• To develop a novel, mild, and chemoselective method for alkylating lenalidomide.
• To establish a facile approach for generating a library of lenalidomide-based PROTACs.
• To evaluate the efficacy of the developed lenalidomide-based PROTACs in degrading target proteins and inhibiting cancer cell proliferation.

Main Methods:

• Organic base-promoted chemoselective alkylation of lenalidomide using various halides.
• Utilizing N,N-Diisopropylethylamine (DIPEA) as an efficient organic base.
• Application of the synthesized lenalidomide derivatives in the construction of BET PROTACs.

Main Results:

• A novel synthetic route for functionalized lenalidomide derivatives was successfully established under mild conditions.
• DIPEA demonstrated superior efficiency as a base compared to inorganic bases for arylamine alkylation.
• The developed lenalidomide-based BET PROTACs effectively degraded BET proteins.
• The BET PROTACs significantly inhibited cancer cell proliferation in vitro.

Conclusions:

• The developed organic base-promoted alkylation provides a versatile strategy for synthesizing lenalidomide-based PROTACs.
• This method offers a novel approach to creating highly functionalized molecules for targeted protein degradation.
• The successful application in BET PROTACs highlights the potential of this methodology for developing new cancer therapeutics.