title: Reactions of 26-iodopseudodiosgenin and 26-iodopseudodiosgenone with various nucleophiles and pharmacological activities of the products.
abstract: 26-Iodopseudodiosgenin (8) and 26-iodopseudodiosgenone (9) were reacted with various nucleophiles (KSCN, KOCN, NaCN, NaN(3) and various amines) to give pseudodiosgenin derivatives (4, 12, 16-20, 26) and pseudodiosgenone derivatives (5, 13, 21-25, 27), respectively. The reactions of 8 and 9 with KOCN gave the elimination products (10) and (11), respectively. The reaction of 9 with NaCN gave 5alpha,26- (14) and 5beta,26-dicyanocholestan-3-one (15). The reaction of 8 with NaN3 gave triazepine derivative (30), while that of 9 gave 26-azidopseudodiosgenone (31). Compound 31 was converted into triazepine derivative (32) by heating at 120 degrees C. The cytotoxicity of the pseudodiosgenins and pseudodiosgenones on P-gp-underexpressing HCT 116 cells and P-gp-overexpressing Hep G2 cells was examined by MTT assay. Pseudodiosgenins 2, 4, 12 and 30 showed strong cytotoxic activity (IC50 values: 2.6+/-0.3-6.7+/-1.4 microM), as did pseudodiosgenones 3, 5, 11, 13, 21-25 and 27 (IC50 values: 1.3+/-0.3-6.4+/-0.3 microM) toward HCT 116 cells. Pseudodiosgenins 12, 16 and 30 (IC50 values: 1.2+/-0.7-2.2+/-0.6 microM) and pseudodiosgenones 22, 23, 25 and 27 (IC50 values: 0.6+/-0.1-2.5+/-0.3 microM) were highly cytotoxic to Hep G2 cells. Compounds 3 and 27 showed efficient antibacterial activity (MIC: 15.6, 10.4 microg/ml) and (MIC: 7.8, 15.6 microg/ml) against Bacillus subtilis and Staphylococcus aureus, respectively.
authors.affiliation: Faculty of Pharmaceutical Sciences, Josai University, Sakado, Saitama, Japan.
authors.forename: Hong-Ji
authors.initials: HJ
authors.lastname: Quan
authors.forename: Jyunichi
authors.initials: J
authors.lastname: Koyanagi
authors.forename: Ken
authors.initials: K
authors.lastname: Hagiwara
authors.forename: Xing-Ri
authors.initials: XR
authors.lastname: Cui
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Isshiki
authors.forename: Seiichi
authors.initials: S
authors.lastname: Kondo
authors.forename: Fusao
authors.initials: F
authors.lastname: Komada
authors.forename: Setsuo
authors.initials: S
authors.lastname: Saito
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D000935:Antifungal Agents / Q000737:chemistry* / Q000494:pharmacology*; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004144:Diosgenin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D005658:Fungi / Q000187:drug effects; D006801:Humans; D007202:Indicators and Reagents; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D012503:Saponins / Q000737:chemistry*
chemical_list: C508580:26-iodopseudodiosgenin; C508581:26-iodopseudodiosgenone; D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D000972:Antineoplastic Agents, Phytogenic; D007202:Indicators and Reagents; D012503:Saponins; D004144:Diosgenin