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Säurekatalysierte Kondensation der Allylalkohole (I) mit den Orthoestern (II) und Orthoester‐Umlagerung nach Claisen liefern Gemische der entsprechenden Pentensäureethyl‐ und ‐allylester, die ohne Isolierung zu" den Pentensäuren (III) verseift werden.
Carbohydrates
Carbohydrates U 0500Nitrile Oxide Cycloadditions to Olefinated Sugars. -Carbohydrate-derived olefins such as (III), are investigated in nitrile oxide 1,3-dipolar cycloaddition. Products (VI) are obtained with a spiro-isoxazoline moiety as is present in psammaplysins and ceratinamides. -(COLINAS, P. A.; JAEGER, V.; LIEBERKNECHT, A.; BRAVO*, R. D.; Tetrahedron Lett.
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