A new coumarin from Calophyllum hosei

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• The genus Calophyllum is known for its diverse secondary metabolites with potential biological activities.
• Natural products from plant sources are crucial for drug discovery and development.
• Phytochemical investigation of Calophyllum hosei stem bark has not been extensively reported.

Purpose of the Study:

• To isolate and characterize chemical constituents from the stem bark of Calophyllum hosei.
• To identify novel compounds and known xanthones from this plant species.
• To contribute to the understanding of the phytochemical profile of Calophyllum hosei.

Main Methods:

• Extraction of plant material (stem bark of Calophyllum hosei).
• Isolation of compounds using chromatographic techniques.
• Structure elucidation using comprehensive spectroscopic analyses, including Nuclear Magnetic Resonance (NMR) spectroscopy (1H NMR, 13C NMR, COSY, DEPT, HMQC, HMBC).

Main Results:

• A new coumarin, named hoseimarin (1), was isolated and structurally characterized.
• Four known xanthones, trapezifolizanthone (2), osajaxanthone (3), β-mangostin (4), and caloxanthone A (5), were identified.
• The structures were confirmed through detailed analysis of 1D and 2D NMR data.

Conclusions:

• The phytochemical investigation of Calophyllum hosei stem bark yielded a new coumarin and four known xanthones.
• The study expands the knowledge of secondary metabolites found in the Calophyllum genus.
• The identified compounds represent potential leads for further pharmacological evaluation.