5-Oxonoraporphines from Mitrephora cf. maingayi

Area of Science:

• Natural Product Chemistry
• Phytochemistry
• Organic Chemistry

Background:

• The bark of Mitrephora cf. maingayi is a potential source of bioactive compounds.
• Previous research may not have fully characterized the chemical constituents of this plant species.

Purpose of the Study:

• To isolate and characterize novel compounds from the bark of Mitrephora cf. maingayi.
• To elucidate the chemical structures of newly discovered 5-oxonoraporphines.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure determination of isolated compounds through Nuclear Magnetic Resonance (NMR) spectroscopy.
• Mass Spectrometry (MS) analysis for molecular weight and fragmentation patterns.

Main Results:

• Two new 5-oxonoraporphines, designated 1 and 2, were successfully isolated.
• The structures were identified as 1,2,3-trimethoxy-5-oxonoraporphine (1) and 1,2-dimethoxy-3-hydroxy-5-oxonoraporphine (2).
• Three known compounds (ouregidione, 3-methoxycepharadione B, and isoelemicin) were also identified.

Conclusions:

• The chemical investigation of Mitrephora cf. maingayi bark yielded two new 5-oxonoraporphine derivatives.
• The structural elucidation confirms the presence of unique chemical scaffolds in this plant.
• These findings expand the knowledge of alkaloid diversity in the Annonaceae family.