Three new flavonoid glycosides from Pinus tabulaeformis Carr

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Organic Chemistry

Background:

• Pinus tabulaeformis Carr. is a conifer species known for its rich phytochemical profile.
• Flavonoid glycosides are a class of plant secondary metabolites with diverse biological activities.
• Understanding the chemical constituents of medicinal plants is crucial for drug discovery and development.

Purpose of the Study:

• To isolate and characterize novel flavonoid glycosides from the needles of Pinus tabulaeformis Carr.
• To elucidate the structures of these isolated compounds using comprehensive spectroscopic methods.
• To contribute to the phytochemical knowledge of the Pinus genus.

Main Methods:

• Extraction of phytochemicals from Pinus tabulaeformis Carr. needles.
• Isolation of compounds using chromatographic techniques (e.g., column chromatography).
• Structure elucidation through spectroscopic analyses, including NMR and Mass Spectrometry.

Main Results:

• Three new flavonoid glycosides were isolated and identified: 7,8,4'-trihydroxy-3,5-dimethoxy-6-methylflavonol-8-O-β-D-glucopyranoside (1), 5,7,4'-trihydroxy-3-methoxy-6-methylflavonol-7-O-β-D-glucopyranoside (2), and 3,5,7,4'-tetrahydroxy-6-methylflavonol-7-O-β-D-glucopyranoside (3).
• Two known flavonoid glycosides were also isolated from the same plant material.
• The structures of all isolated compounds were confirmed by detailed spectroscopic data analysis.

Conclusions:

• The study successfully identified five flavonoid glycosides from Pinus tabulaeformis Carr. needles, including three novel compounds.
• The structural characterization provides valuable data on the chemical diversity of flavonoids in this species.
• These findings enhance the understanding of Pinus tabulaeformis Carr. as a source of unique natural products.