was synthesized from naturally occurring cyclitol, L-quebrachitol via the conduramine derivative, which was prepared regio- and stereoselectively by the Pd-catalyzed azidation of the allyl carbonate derivative. Condensation of phytosphingosines with 2-acetoxy fatty acid residue, followed by glycosidation, furnished the total synthesis. This work established an effective synthetic pathway to a wide
描述了从海星中分离的新型脑苷脂、棘突脑苷脂 A (1) 和星形脑苷脂 A (2) 的手性和立体选择性全合成。1 和 2 中的植物鞘氨醇部分是通过二烷基镁试剂与常见的环氧化物中间体 2-(t-butoxycarbonyl)amino-1-O-(t-butyldiphenylsilyl)-2-deoxy-3-O-( 4-甲氧基苄基)-D-4,5-脱水核糖醇 (5)。环氧化物 (5) 是由天然存在的环醇、L-白木糖醇通过康杜拉明衍生物合成的,该衍生物是通过 Pd 催化的碳酸烯丙酯衍生物的叠氮化反应制备的。植物鞘氨醇与 2-乙酰氧基脂肪酸残基的缩合,然后是糖苷化,提供全合成。这项工作建立了一种有效的合成途径,可合成含有多种植物鞘氨醇和 2-羟基脂肪酸残基的多种脑苷脂;第一次全合成astrocerebroside A (2) 充分证实了所提出的结构。
Lipase-mediated efficient preparation of both enantiomers of 2-acetoxytetracosanoic acid, the intermediate for sphingolipid synthesis
作者:Takeshi Sugai、Hiromichi Ohta
DOI:10.1016/0040-4039(91)85040-c
日期:1991.11
acetate-tetrahydrofuran at refluxing temperature was quite effective to perform enzymatic transesterification of highly crystalline substrate, such as 2-hydroxytetracosanoic acid a representative type of long-chain α-hydroxy acid. In that case, catalytic amount of di-t-butyl p-cresol (BHT) was essential as a polymerization inhibitor for vinyl acetate.
A medicinal composition comprising at least one compound represented by general formula (A), specifically a myeloid cell growth promoter, a radiation damage protective and a thrombocytopenia remedy, wherein R represents (α), (R₂ being H or OH, and X being an integer of 0 to 26) or -(CH₂)₇CH=CH(CH₂)₇CH₃; R₁ represents a substituent selected from the group consisting of -CH₂(CH₂)YCH₃, -CH(OH)(CH₂)YCH₃, -CH(OH)(CH₂)YCH(CH₃)₂ and -CH=CH(CH₂)YCH₃; and Y represents an integer of 5 to 17.
一种药物组合物,包含至少一种由通式(A)代表的化合物,特别是一种髓系细胞生长促进剂、一种辐射损伤保护剂和一种血小板减少治疗剂,其中 R 代表(α),(R₂为 H 或 OH,X 为 0 至 26 的整数)或-(CH₂)₇CH=CH(CH₂)₇CH₃;R₁ 代表选自以下组成的组的取代基:-CH₂(CH₂)YCH₃、-CH(OH)(CH₂)YCH₃、-CH(OH)(CH₂)YCH(CH₃)₂ 和 -CH=CH(CH₂)YCH₃;以及 Y 代表 5 至 17 的整数。
Structure-Activity Relationship of .alpha.-Galactosylceramides against B16-Bearing Mice
Agelasphin-9b, (2S,3S,4R)-1-O-(alpha-D-galactopyranosyl)-16-methyl-2-[N-((R)-2-hydroxytetracosanoyl)-amino]-1,3,4-heptadecanetriol, is a potent antitumor agent isolated from the marine sponge Agelas mauritianus. Various analogues of agelasphin-9b (a lead compound) were synthesized, and the relationship between their structures and biological activities was examined using several assay systems. From the results, KRN7000, (2S,3S;4R)-1-O-(alpha-D-galactopyranosyl)2-(N-hexacosanoylamino)-1,3,4-octadecanetriol, was selected as a candidate for clinical application.
Total Synthesis of Agelagalastatin
作者:Yong Joo Lee、Bo-Young Lee、Heung Bae Jeon、Kwan Soo Kim
DOI:10.1021/ol061444o
日期:2006.8.1
The total synthesis of agelagalastatin, an antineoplastic glycosphingolipid, has been achieved. The synthesis involved an alpha-selective glycosylation of the ceramide moiety with the trisaccharide fluoride. The trisaccharide component was constructed employing the CB glycoside method which permitted a completely alpha-stereoselective galactofuranosylation.