Absolute configuration of franganine

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Spectroscopy

Background:

• Cyclopeptide alkaloids are a class of natural products with diverse biological activities.
• Discaria americana is a plant source from which novel compounds can be isolated.

Purpose of the Study:

• To determine the absolute configuration of franganine, a cyclopeptide alkaloid.
• To elucidate the structure of franganine using spectroscopic and crystallographic methods.

Main Methods:

• Isolation of franganine from the methanol root bark extract of Discaria americana.
• Detailed Nuclear Magnetic Resonance (NMR) spectroscopic analysis.
• X-ray diffraction analysis of a franganine salt.

Main Results:

• The absolute configuration of franganine (1) was successfully established.
• The structure was confirmed through comprehensive NMR data.
• X-ray diffraction analysis of its salt (2) provided definitive structural information.

Conclusions:

• The absolute configuration of franganine has been unambiguously determined.
• This study provides crucial structural data for the cyclopeptide alkaloid franganine.
• The findings contribute to the understanding of natural products from Discaria americana.