Two new polyprenylated acylphloroglucinols from Hypericum scabrum

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Phytochemistry

Background:

• Hypericum scabrum is a plant species known for its diverse secondary metabolites.
• Polyprenylated acylphloroglucinols represent a class of compounds with potential biological activities.
• Understanding the chemical constituents of medicinal plants is crucial for drug discovery.

Purpose of the Study:

• To isolate and characterize new chemical entities from Hypericum scabrum.
• To elucidate the structures of novel polyprenylated acylphloroglucinols.
• To contribute to the knowledge of the phytochemical diversity of the Hypericum genus.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation employing Mass Spectrometry (MS), Infrared (IR) spectroscopy, Nuclear Magnetic Resonance (NMR) spectroscopy (1D and 2D), Optical Rotation (OR), and Circular Dichroism (CD).

Main Results:

• Two new polyprenylated acylphloroglucinols, designated as compounds 1 and 2, were successfully isolated.
• The complete structures of compounds 1 and 2 were determined through comprehensive spectroscopic analysis.
• Compound 1: (1S,32R,5S,6R,7R)-6-((R)-3,4-di-hydroxy-4-methylpentyl)-2-(2-hydroxypropan-2-yl)-7-isobutyryl-6-methyl-5,9-bis(3-methylbut-2-en-1-yl)-4,5,6,7-tetrahydro-2H-32,7-methanocycloocta[b]furan-8,10(3H)-dione.
• Compound 2: (4R,5R,7R)-4-((R)-3,4-dihydroxy-4-methylpentyl)-2,2,4-trimethyl-5,7-bis(3-methyl-but-2-en-1-yl)-7-(5-methylhex-4-enoyl)-4,5,6,7-tetrahydrobenzofuran-3(2H)-one.

Conclusions:

• The study successfully identified and characterized two unprecedented polyprenylated acylphloroglucinols from Hypericum scabrum.
• The findings expand the known structural diversity of natural products within the Hypericum genus.
• The detailed structural elucidation provides a foundation for future investigations into the biological activities of these novel compounds.