N-Methyl-2-thio-cytisine.

Area of Science:

• Organic Chemistry
• Crystallography
• Medicinal Chemistry

Background:

• Cytisine is a natural alkaloid with a complex polycyclic structure.
• Understanding the conformational flexibility and intermolecular interactions of cytisine derivatives is crucial for drug design.

Purpose of the Study:

• To elucidate the crystal structure and conformational properties of a novel cytisine derivative.
• To investigate the non-covalent interactions governing the self-assembly of this compound in the solid state.

Main Methods:

• Single-crystal X-ray diffraction analysis was employed to determine the molecular and crystal structure.
• Analysis of bond lengths, angles, and non-covalent interactions (C-H⋯π, C-H⋯S) was performed.

Main Results:

• The title compound, (1R,5S)-1,2,3,4,5,6-hexa-hydro-1,5-methano-8H-pyrido[1,2-a][1,5]diazo-cine-8-thione, features a three-ring system with planar, half-chair, and chair conformations.
• Molecules are assembled into helical chains along the [001] direction through directional C-H⋯π and C-H⋯S interactions.

Conclusions:

• The study provides detailed structural insights into a cytisine derivative, highlighting its conformational diversity.
• The identified intermolecular interactions are key to understanding the packing and stability of this class of compounds.