Conformation of glyburide in the solid state and in solution

Area of Science:

• Structural Biology
• Medicinal Chemistry
• Spectroscopy

Background:

• Glyburide (C23H28CIN3O5S) is a crucial pharmaceutical agent.
• Understanding its molecular conformation is vital for drug design and efficacy.
• Conformational flexibility can impact drug-receptor interactions and bioavailability.

Purpose of the Study:

• To elucidate the solution and solid-state conformations of glyburide.
• To compare the conformational dynamics between different physical states.
• To provide insights into structure-activity relationships.

Main Methods:

• Combined Nuclear Magnetic Resonance (NMR) spectroscopy for solution-state analysis.
• X-ray crystallography for solid-state structural determination.
• Analysis of torsion angles to define molecular geometry.

Main Results:

• Glyburide exhibits free rotation about several single bonds in solution.
• The solid-state crystal structure belongs to space group P2(1)/n.
• Solid-state conformation is predominantly extended, with specific torsion angles reported for key bonds.
• Solution and solid-state NMR spectra differ, reflecting conformational variations.

Conclusions:

• Significant conformational differences exist between glyburide in solution and in the solid state.
• The extended conformation in the solid state is largely maintained, except for the N(8)-C(9) bond.
• These findings contribute to a deeper understanding of glyburide's structural behavior.