Longipinene derivatives from Santolina viscosa

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Phytochemistry

Background:

• Santolina viscosa is a plant species known for its diverse chemical constituents.
• Previous studies have identified various compounds from Santolina species, but the longipinene derivatives remain underexplored.
• Understanding the chemical profile of S. viscosa can lead to the discovery of novel bioactive molecules.

Purpose of the Study:

• To isolate and characterize new chemical entities from the hexane extract of Santolina viscosa aerial parts.
• To elucidate the structures of the isolated compounds using advanced spectroscopic and chemical techniques.
• To re-evaluate and correct the structural assignment of previously reported compounds like oblongifolidiol.

Main Methods:

• Extraction of aerial parts of Santolina viscosa using hexane.
• Isolation of compounds using chromatographic techniques.
• Structure elucidation employing 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy, Mass Spectrometry (MS), and Infrared (IR) spectroscopy.
• Chemical transformations and X-ray diffraction for structural confirmation.

Main Results:

• Isolation of eight new longipinene derivatives (compounds 1-8).
• Identification of oblongifolidiol (compound 9) and other known compounds.
• Full structural characterization of the new longipinene derivatives.
• Correction of the previously reported structure of oblongifolidiol, reassigning it as a longipinene derivative (9) based on comprehensive spectroscopic and crystallographic data.

Conclusions:

• The study successfully identified and characterized eight novel longipinene derivatives from Santolina viscosa.
• The structural reassignment of oblongifolidiol provides a more accurate understanding of the plant's chemical diversity.
• These findings contribute to the knowledge of longipinene chemistry and the phytochemistry of the Santolina genus.