Synthèse des 2-amino-2-désoxy-d-arabinono- et -d-xylono-lactones par condensation d'acides aminés avec le d-glycéraldéhyde. Analyse structurale par rayons X de deux dérivés
✍ Scribed by Jean-Claude Depezay; Annie Dureault; Thierry Prange
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 626 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0008-6215
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✦ Synopsis
Synthesis of 2-amino-2-deoxy-D-pentonolactones was performed by diastereoselective hydroxyalkylation of 2,3-0-isopropylidene-D-glyceraldehyde with ethyl isocyanoacetate, to give two oxazolines in a ratio of 7:3. Hydrolysis gave first the corresponding amides, and then the 2-amino-2-deoxypentonolactones. The structure of the 2-amino-2-deoxy-p-arabinono-1 ,Clactone was established by X-ray diffraction, indicating exclusive formation of truns-oxazolines and of an "erythro" configuration at C-3-C-4 of the major compound. SOMMAIRE La synthese de 2-amino-2-desoxy-D-pentonolactones est accomplie par hydroxyalkylation diastereoselective du 2,3-0-isopropylidbne-D-glyceraldthyde par l'isocyanadtate d'tthyle. 11 se forme uniquement deux oxazolines dans le rapport 7 : 3. Ces oxazolines sont hydrolysees en amides, puis en 2-amino-2-desoxy-pentonolactones. La structure de la 2-amino-2-desoxy-u-arabinono-1,4-lactone a Cte Ctablie par diffraction de rayons X. Ce rtsultat permet de conclure a la formation exclusive d'oxazolines tram et d'attribuer une relation "Prythro" B C-3-C-4 du compose majoritaire.
📜 SIMILAR VOLUMES
## Abstract The addition of cyanohydric acid to 1,2:5,6‐di‐O‐isopropylidene‐α‐D‐__ribo__‐hexofurannos‐3‐ulose can be sterically controlled. Under kinetic conditions, the __allo__ cyanohydrine epimer is formed, under thermodynamic conditions, the __gluco__ epimer is formed. The configuration of thes