Crystal structures of two alanyl-piperidine analogues

Area of Science:

• Medicinal Chemistry
• Crystallography
• Biochemistry

Background:

• Ubiquitin C-terminal Hydrolase-L1 (UCH-L1) is a key enzyme in protein degradation pathways.
• Activators of UCH-L1 are of interest for therapeutic applications.
• Compound I, ethyl 1-[N-(4-methyl-phenyl)-N-(methyl-sulfonyl)alanyl]piperidine-4-carboxylate, is a known UCH-L1 activator.

Purpose of the Study:

• To determine the crystal structure of compound I using single-crystal X-ray diffraction (SCXRD).
• To synthesize and characterize a derivative of compound I (compound II) with a carboxylic acid group.
• To investigate the crystal packing, hydrogen bonding, and polymorphism of compound II.

Main Methods:

• Single-crystal X-ray diffraction (SCXRD) analysis for structure determination.
• Chemical synthesis of compound II.
• Polymorph risk assessment for compound II.

Main Results:

• The crystal structure of compound I was successfully determined.
• Compound II was synthesized and its crystal structure analyzed.
• Different crystal packing arrangements were observed between compound I and II.
• Compound II exhibits strong hydrogen bonding due to its carboxylic acid group.
• Polymorphism analysis was conducted for compound II.

Conclusions:

• The structural elucidation of compound I provides insights into UCH-L1 activation mechanisms.
• Compound II, a derivative of compound I, was successfully synthesized and characterized.
• The presence of a carboxylic acid group in compound II influences its crystal packing and intermolecular interactions.
• Understanding crystal packing and polymorphism is crucial for drug development and formulation.