3β-Hydroxy-28-norolea-12,17-dien-11-one.

Area of Science:

• Organic Chemistry
• Crystallography
• Natural Products Chemistry

Background:

• Triterpenoids are a diverse class of natural products with significant biological activities.
• Understanding the structure and properties of triterpenoids is crucial for drug discovery and development.
• 11-oxooleanolic acid serves as a precursor for synthesizing various triterpenoid derivatives.

Purpose of the Study:

• To synthesize a new compound from 11-oxooleanolic acid under alkaline conditions.
• To elucidate the crystal structure and molecular conformation of the synthesized compound.
• To investigate the intermolecular interactions within the crystal lattice.

Main Methods:

• Chemical synthesis involving treatment of 11-oxooleanolic acid with strong alkali.
• Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.
• Conformational analysis of the triterpenoid rings (A, B, C, D, E).

Main Results:

• Successful synthesis of a C29H44O2 compound, a derivative of oleanolic acid.
• The asymmetric unit contains two molecules with distinct conformations in rings D and E.
• Molecules are linked via O-H⋯O hydrogen bonds, forming chains parallel to the b axis.

Conclusions:

• The study provides detailed structural information on a novel triterpenoid.
• The conformational flexibility of the triterpenoid skeleton is highlighted.
• Hydrogen bonding plays a key role in the crystal packing of this compound.