The synthesis of 5-acetamido-4-deoxyneuraminic acid (1) is described. Acetylation of a mixture of the epimeric triols 4 and 5 gave the tetraacetates 7 and 8 (Scheme I). Ozonolysis of a mixture of these acetates followed by base-promoted B-elimination led to the ( E ) -configurated a,B-unsaturated ke
Deoxy-nitrosugars. 4th communication. Convenient synthesis of 1-deoxy-1-nitroaldoses
✍ Scribed by Bernard Aebischer; Andrea Vasella
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- German
- Weight
- 359 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
A new synthesis of 1‐deoxy‐1‐nitroaldoses by ozonolysis of N‐glycosylnitrones according to the procedure of Bailey et al. is described. Based on the oxime 1, the mannofuranosylnitrones 3–5 were obtained in yields of 86–88% and the 1‐deoxy‐1‐nitromannose 6 in yields of 70–76%. In the same manner the 1‐deoxy‐1‐nitroaldoses 9, 12, 18, and 19 were prepared in yields of 61–90% from the oximes 7, 10, 14 and 15, the procedure being compatible with the presence of free hydroxy groups.
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## Abstract A general approach to isosteric phosphonate analogues of ulose‐l‐phosphates is described. A base‐catalysed chain elongation __via__ a __Michael__ addition of 1‐deoxy‐1‐nitro‐sugars **4, 8**, and **16** to the vinylphosphonate **18** followed by hydrolysis of the nitro adducts gave the a
## Abstract Partially protected 4‐ or 5‐hydroxy‐sugar oximes were transformed into 5‐ or 6‐membered 1‐__C__‐nitroglycosyl chlorides, respectively, by reaction with NaOCl under phase‐transfer conditions. With the exception of the oxidation of the __gluco__‐derivative **1** giving the anomers **6** a
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## Abstract The chain elongation of the deoxy‐nitroribose **6** by a __Michael__ addition to the vinyl‐phosphonate **7** followed by a solvolysis gave the heptulosephosphonate **11** (87%). From **11**, the key intermediates **15** and **16** (77%) were obtained by a highly diastereoselective reduc
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