作者:Hang-Ji Quan、Jyunichi Koyanagi、Koichi Ohmori、Shinichi Uesato、Tetsuaki Tsuchido、Setsuo Saito
DOI:10.1016/s0223-5234(02)01386-7
日期:2002.8
(3beta,20S,22S,25R)-22-Thiospirosol-5-en-3-ol (9) and (3beta,20S,22S,25R)-22-seleno-spirosol-5-en-3-ol (11) were prepared from diosgenin (3) via 26-iodopseudodiosgenin (6) as a key intermediate. Diosgenone (15), solasodinone (16), (20S,22S,25R)-22-thiospirosol-4-en-3-one (17), (20 S,22S,2 5R)-22-selenospirosol-4-en-3-one (18) and (20R,22S, 2 5R)-spirosol-4-en-3-one (19) were prepared by Oppenauer oxidation of 3, solasodine 4, 9, 11 and (3beta,20R,22R,25R)-spirosol-5-en-3-ol 14, respectively. Oxidations of 15 and 16 with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) provided corresponding dienone products, (20S,22S,25R)spirosol-1,4-dien-3 -one (20) and (20S, 22S, 25R)-22-thiospirosol-1,4-dien-3 -one (21), respectively, while oxidation of 19 (C-20 diastereoisomer of 15) gave no dienone product but 21-exo vinyl product 22. 26-Thioacetylpseudodiosgenone (24) and 26-cyanoselenopseudodiosgenone (25) were prepared by treatment of 26-iodopseudodiosgenose (23), which was obtained by Oppenauer oxidation of 6, with potassium thioacetate and potassium selenocyanate, respectively. Compounds 15 and 19 exhibited more than 80% inhibitions in INF-gamma productions at 10.0 muM. Compounds 4 and 25 showed cytotoxic activities (IC50 = 6 and 5 muM, respectively) against cancerous HCT 116 cell lines. Compounds 12 and 25 had antiurease activities (IC50 = 12.4 and 11.4 muM, respectively), in which only the latter showed an inhibition zone (mean zone diameter = 12.2 mm) formed by Bacillus subtilis 168 trp. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
(3β,20S,22S,25R)-22-硫二环甾-5-烯-3-醇 (9) 和 (3β,20S,22S,25R)-22-硒二环甾-5-烯-3-醇 (11) 通过以 26-碘伪 Diosgenin (6) 为关键中间体,从 Diosgenin (3) 中制备得到。Diosgenone (15)、Solasodinone (16)、(20S,22S,25R)-22-硫二环甾-4-烯-3-酮 (17)、(20S,22S,25R)-22-硒二环甾-4-烯-3-酮 (18) 和 (20R,22S,25R)-二环甾-4-烯-3-酮 (19) 分别由 Oppenauer 氧化 Diosgenin (3)、Solasodine (4)、9、11 和 (3β,20R,22R,25R)-二环甾-5-烯-3-醇 (14) 制得。15 和 16 与 2,3-二氯-5,6-二氰基-1,4-苯并醌 (DDQ) 的氧化反应分别生成相应的二烯酮产物:(20S,22S,25R)-二环甾-1,4-二烯-3-酮 (20) 和 (20S,22S,25R)-22-硫二环甾-1,4-二烯-3-酮 (21)。然而,19 (15 的 C-20 对映异构体) 的氧化未产生二烯酮产物,而是生成了外侧烯烃产物 22。26-硫代乙酰基伪 Diosgenone (24) 和 26-亚硝基硒代伪 Diosgenone (25) 通过分别用硫代乙酸钾和硒代亚硝酸钾处理由 6 的 Oppenauer 氧化产物 23 制得。化合物 15 和 19 在 10.0 μM 浓度下对 INF-γ 的生产表现出超过 80% 的抑制作用。化合物 4 和 25 对癌细胞 HCT 116 系显示出细胞毒性活性 (IC50 = 6 和 5 μM)。化合物 12 和 25 具有抗尿酶活性 (IC50 = 12.4 和 11.4 μM),其中只有后者表现出由 Bacillus subtilis 168 trp 形成的抑制区 (平均区直径 = 12.2 mm)。
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