Total Synthesis of an Immunosuppressive Glycolipid, (<i>2S,3S,4R</i>)-1-<i>O</i>- (α-<scp>d</scp>-Galactosyl)-2- tetracosanoylamino-1,3,4-nonanetriol
作者:Kenji Murata、Tetsuya Toba、Kyoko Nakanishi、Bitoku Takahashi、Takashi Yamamura、Sachiko Miyake、Hirokazu Annoura
DOI:10.1021/jo048151y
日期:2005.3.1
A practical and efficient total synthesis of (2S,3S,4R)-1-O-(α-d-galactosyl)-2-tetracosanoylamino-1,3,4-nonanetriol, OCH 1b, a potential therapeutic candidate for Th1-mediated autoimmune diseases, is described. The synthesis incorporates direct alkylation onto epoxide 5 and stereospecific halide ion catalyzed α-glycosidation reaction. A key intermediate 10 was obtained in only eight steps and 37% overall
实用有效的全合成(2S,3S,4R)-1- O-(α - d-半乳糖基)-2-四cosanoylamino-1,3,4-壬三醇OCH 1b(Th1介导的潜在治疗候选物)描述了自身免疫性疾病。该合成将直接烷基化结合到环氧化物5上,并通过立体特异性卤化物离子催化的α-糖基化反应。从市售的d-阿拉伯糖醇2和1b的总合成中,仅需八步即可获得关键中间体10,总收率达到37%。分12步完成,总收率19%。该方法将能够以高度立体选择性的方式合成多种植物鞘氨醇脂,特别是具有比1a短的鞘氨醇侧链的植物鞘氨醇脂。