Epibisde-hydro-neotuberostemonine J.

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Structural Biology

Background:

• Stemona alkaloids are a class of natural products with diverse biological activities.
• Understanding the precise three-dimensional structure of these compounds is crucial for elucidating their mechanism of action and for drug design.
• Previous structural studies of Stemona alkaloids have provided insights into their complex molecular architectures.

Purpose of the Study:

• To elucidate the detailed molecular structure and crystal packing of a specific Stemona alkaloid, C22H29NO4.
• To characterize the conformations of the various rings within the molecule.
• To investigate the intermolecular interactions present in the crystalline state.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular structure.
• Conformational analysis of the different ring systems was performed.
• Analysis of intermolecular interactions, including hydrogen bonding, was conducted.

Main Results:

• The title compound, C22H29NO4, was structurally characterized, revealing a complex polycyclic system.
• The five-membered rings A and E adopted envelope conformations, ring C was planar, ring B exhibited a twist-chair conformation, and ring D adopted a chair conformation.
• The crystal structure is stabilized by weak C-H⋯O interactions, forming a three-dimensional network.

Conclusions:

• The detailed structural analysis provides a foundation for understanding the structure-activity relationships of this Stemona alkaloid.
• The identified ring conformations and intermolecular interactions offer insights into the molecule's stability and potential biological interactions.
• This structural data is valuable for future synthetic efforts and the development of novel therapeutic agents based on the Stemona alkaloid scaffold.