3″-Hydroxymethyl-butyrolactone II from Aspergillus sp

Area of Science:

• Natural Product Chemistry
• Mycology
• Organic Chemistry

Background:

• Terrestrial fungi, particularly Aspergillus species, are a rich source of novel bioactive compounds.
• The ongoing exploration of fungal secondary metabolites is crucial for discovering new chemical entities.

Purpose of the Study:

• To isolate and characterize new chemical compounds from the terrestrial fungus Aspergillus sp.
• To elucidate the structure and determine the absolute configuration of the newly discovered butyrolactone.

Main Methods:

• Isolation and purification of the target compound using chromatographic techniques.
• Structure elucidation employing extensive 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
• High-Resolution Electrospray Ionization Mass Spectrometry (HR-ESI-MS) for accurate mass determination.
• Comparison with existing literature data for structural confirmation.
• Electronic Circular Dichroism (ECD) calculations for determining the absolute configuration.

Main Results:

• Isolation of one new butyrolactone derivative, designated as 3″-hydroxymethyl-butyrolactone II (compound 1).
• Comprehensive spectroscopic data (1D/2D NMR, HR-ESI-MS) confirmed the chemical structure of compound 1.
• Comparison with literature data validated the proposed structure.
• ECD calculations successfully determined the absolute configuration of the new compound.

Conclusions:

• A novel butyrolactone, 3″-hydroxymethyl-butyrolactone II, was successfully isolated from Aspergillus sp.
• The study highlights the potential of terrestrial fungi as a source for new chemical structures.
• Advanced analytical techniques were effectively utilized for the complete characterization of the new natural product.