Gabapentin hybrid peptides and bioconjugates.

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Drug Delivery

Background:

• Gabapentin is prone to cyclization, forming a gamma-lactam, which complicates its conjugation.
• Developing stable gabapentin conjugates is crucial for creating effective prodrugs and targeted delivery systems.

Purpose of the Study:

• To investigate synthetic routes for gabapentin bioconjugates that circumvent lactamization.
• To explore the formation of conformationally constrained gabapentin units within conjugates.

Main Methods:

• N-acylation of gabapentin with amino acids to form di-, tri-, and tetrapeptides.
• Utilizing carboxyl-activated, Boc-protected gabapentin for acylation reactions.
• Conjugation of gabapentin to small peptides and hormones via N-, O-, and S-acylation.

Main Results:

• Successfully synthesized gabapentin-containing di-, tri-, and tetrapeptides, including L-Ala-Gbp, L-Val-Gbp, L-Ala-L-Phe-Gbp, and Gly-L-Ala-β-Ala-Gbp.
• Developed methods for N-, O-, and S-acylation of biomolecules using activated gabapentin.
• Created novel prodrugs featuring conformationally constrained gabapentin units.

Conclusions:

• The synthetic approaches effectively prevent gabapentin lactamization during bioconjugation.
• The developed methods allow for the creation of stable gabapentin conjugates and prodrugs with potential therapeutic applications.