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Mohamed OG, Shalabi AA, El Halawany AM, Tripathi A, Abdel-Sattar E. Hexagonosides A-F: Pregnane glycosides isolated from Caralluma hexagona. Phytochemistry 2024; 217:113903. [PMID: 37918619 DOI: 10.1016/j.phytochem.2023.113903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 10/18/2023] [Accepted: 10/22/2023] [Indexed: 11/04/2023]
Abstract
Chemical investigation of Caralluma hexagona Lavranos, a wild plant growing in Yemen, led to the isolation of four previously undescribed acylated pregnane glycosides, hexagonosides A-D (1-4), together with two sets of mixtures (hexagonosides E and F), each set consists of three interconvertible pregnane glycoside isomers, hexagonosides E (5a-c) and F (6a-c). The chemical structures of the isolated pregnane glycosides were elucidated by extensive 1D/2D NMR and HRESI-MS analysis, featuring 6'-O-benzoyl-1'-O-β-glucosyl residue at aglycone C-20; while aglycone C-3 was substituted with disaccharide sugar chain (1, 2, 5a-c) or a trisaccharide sugar chain (3, 4, 6a-c). Metabolites E and F included an extra benzoyl substitution in C-20 glucosyl residue which is migrating between the OH groups of C-2', C-3' and C-4' resulting in equilibrating conformations (5a-c and 6a-c) when incubated in HPLC solvent, which we confirmed by the analytical study.
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Affiliation(s)
- Osama G Mohamed
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Kasr el Aini St., Cairo, 11562, Egypt; Natural Products Discovery Core, Life Sciences Institute, University of Michigan, Ann Arbor, MI, 48109, USA.
| | - Akram A Shalabi
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Kasr el Aini St., Cairo, 11562, Egypt
| | - Ali M El Halawany
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Kasr el Aini St., Cairo, 11562, Egypt
| | - Ashootosh Tripathi
- Natural Products Discovery Core, Life Sciences Institute, University of Michigan, Ann Arbor, MI, 48109, USA; Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA.
| | - Essam Abdel-Sattar
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Kasr el Aini St., Cairo, 11562, Egypt.
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