Cardiac glycosides from Erysimum cheiranthoides

Area of Science:

• Natural Product Chemistry
• Pharmacognosy
• Organic Chemistry

Background:

• Cardiac glycosides are a class of naturally occurring compounds with significant pharmacological activity.
• Erysimum cheiranthoides is a plant species known to contain various bioactive compounds.

Purpose of the Study:

• To isolate and characterize new cardiac glycosides from Erysimum cheiranthoides seeds.
• To elucidate the chemical structures of the isolated compounds using spectroscopic methods.
• To identify novel structural features within the aglycone moiety of cardiac glycosides.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation employing spectroscopic data (e.g., NMR, MS).
• Chemical characterization of isolated cardiac glycosides.

Main Results:

• Three new cardiac glycosides, cheiranthoside VIII (1), cheiranthoside IX (2), and cheiranthoside X (3), were successfully isolated.
• The structures were determined as strophanthidin 3-O-beta-D-glucopyranosyl-(1-->4)-beta-D-antiaropyranoside (1), cheiranthidin 3-O-beta-D-glucopyranosyl-(1-->4)-beta-D-boiviopyranoside (2), and cheiranthidin 3-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-digitoxopyranoside (3).
• A carboxyl group at the C-10 position of the aglycone in compounds 2 and 3 was identified for the first time.

Conclusions:

• The study successfully identified and characterized three novel cardiac glycosides from Erysimum cheiranthoides.
• The discovery of a C-10 carboxyl group in the aglycone moiety represents a significant finding in cardiac glycoside chemistry.
• These findings contribute to the understanding of the structural diversity and biosynthetic pathways of cardiac glycosides.