C21 steroidal glycosides from Hemidesmus indicus

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Organic Chemistry

Background:

• Hemidesmus indicus (family: Asclepiadaceae) is a plant with a history of traditional medicinal use.
• The isolation and characterization of novel compounds from medicinal plants contribute to understanding their chemical diversity and potential applications.

Purpose of the Study:

• To isolate and elucidate the structures of novel pregnane glycosides from the dried stem of Hemidesmus indicus.
• To characterize the isolated compounds using spectroscopic techniques.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation using 1H and 13C NMR spectroscopy.
• Mass spectrometry analysis using Fast Atom Bombardment Mass Spectrometry (FABMS).

Main Results:

• Two novel pregnane glycosides, named denicunine (1) and heminine (4), were successfully isolated.
• The structure of denicunine was determined to be calogenin 3-O-3-O-methyl-beta-D-fucopyranosyl-(1-->4)-O-beta-D-oleandropyranoside.
• The structure of heminine was determined to be calogenin 3-O-beta-D-cymaropyranosyl-(1-->4)-O-beta-D-digitoxopyranoside.

Conclusions:

• The study successfully identified and characterized two new pregnane glycosides from Hemidesmus indicus.
• The findings expand the knowledge of the chemical constituents of Hemidesmus indicus and contribute to the field of natural product chemistry.