| 摘要 |
A process for preparing retinyl glycosides of the formula I <IMAGE> (I) where Z is a glycosidic residue, by glycosidation of a completely acylated carbohydrate or completely acylated glycosidic polymer of the formula II Z (acylated)-Y(II) where Y is a leaving group customary for glycosidations in the 1-position of the glycoside, comprises the acylated glycoside being reacted with an aldehyde-protected 4-hydroxy-2-methyl-2-buten-1-al under the conditions customary for glycosidations, eliminating the aldehyde protective group from the resulting compound, subjecting the resulting aldehyde to a Wittig reaction with a beta -ionylideneethyltriphenylphosphonium salt and eliminating the acyl groups on the resulting retinyl glycoside in a conventional manner. The process according to the invention is particularly important for preparing retinyl glycosides of the formula Ia <IMAGE> (Ia) where R is -CH2-OH, -COOH or -COOCH3. Intermediates of this process are also claimed.
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