Absolute configuration of trixanolides from Trixis pallida

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Organic Chemistry

Background:

• Trixis pallida is a plant species known to produce bioactive compounds.
• Trixanolides are a class of natural products with diverse biological activities.
• Previous studies have explored the chemical constituents of T. pallida, but further investigation is warranted.

Purpose of the Study:

• To isolate and characterize new trixanolides from the aerial parts of Trixis pallida.
• To elucidate the structures of these compounds using spectroscopic techniques.
• To determine the absolute configuration of the trixane skeleton and discuss its biosynthetic implications.

Main Methods:

• Extraction and isolation of compounds from Trixis pallida aerial parts.
• Structure elucidation using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
• Determination of absolute configuration via the Mosher method and comparison with Horeau method results.

Main Results:

• Isolation of seventeen novel trixanolides (compounds 1-17) and seven known trixanolides (compounds 18-24).
• Complete structural determination of all isolated compounds through comprehensive NMR analysis.
• Determination of the absolute configuration of the trixane skeleton, revealing an enantiomeric relationship to previously reported configurations.

Conclusions:

• The study expands the known diversity of trixanolides by discovering 17 new compounds.
• The enantiomeric configuration determined provides crucial data for understanding the stereochemical pathways in trixanolide biosynthesis.
• The findings contribute to the chemotaxonomic understanding of the Trixis genus.