title: New withanolides and other constituents from the fruit of Withania somnifera.
abstract: Two new steroidal lactones of the withanolide-type, 5beta, 6alpha, 14alpha, 17beta, 20beta-pentahydroxy-1-oxo-20 S, 22R-witha-2, 24-dienolide (1)and 6alpha, 7alpha-epoxy-5alpha, 14alpha, 17alpha, 23beta-tetrahydroxy-1-oxo-22R-witha-2, 24-dienolide (2), were isolated from the fruit of Withania somnifera (L.) Dunal (Solanaceae) growing in Southern Egypt, together with two known coumarins, scopoletin (3)and aesculetin (4), a known triterpene, viz. Beta-amyrin (5), and two known phytosterols, viz. stigmasterol (6) and sitosterol (7). The structures of the isolated compounds have been elucidated by spectroscopic methods including UV, IR, (1)H-, (13)C-NMR, DEPT experiments, HRFAB-, FAB-, and EI-mass spectrometry. The in vitro antimicrobial activity of the new withanolide (1) and the alcoholic fruit extract are discussed.
authors.affiliation: Department of Chemistry, Faculty of Science, South Valley University, Aswan, Egypt. ahmadaboudouh@hotmail.com
authors.forename: Ahmad M
authors.initials: AM
authors.lastname: Abou-Douh
mesh_terms: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D004534:Egypt; D005638:Fruit / Q000737:chemistry; D005658:Fungi / Q000187:drug effects; D007783:Lactones / Q000737:chemistry* / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D019657:Solanaceae / Q000737:chemistry*; D013256:Steroids / Q000737:chemistry* / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D007783:Lactones; D010936:Plant Extracts; D013256:Steroids