Summary
Readily available Neu5Ac derivatives1 and7 are oxidized by RuO4 to the ketones2 and8 which are reduced diastereoselectively by the borane-ammonia complex to yield the4- and 8-epimers4a and10. Subsequent deprotection leads to the title compounds5 and12. This few step procedure is also applicable on gram scale.
Zusammenfassung
Die leicht zugänglichen Neuraminsäurederivate1 und7 werden mittels RuO4 in die Ketone2 und8 umgewandelt, welche mit dem Ammoniak-Boran-Komplex diastereoselektiv zu den entsprechenden 4- und 8-Epimeren4 a und10 reduziert werden. Anschließende Deblockierungsschritte führen zu den Titelverbindungen5 und12. Diese Synthesewege sind für den Grammaßstab ausgearbeitet worden.
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Hartmann, M., Zbiral, E. Structural variations of N-Acetylneuraminic acid, 12: A new useful approach to 4-epi- and 8-epi-N-Acetylneuraminic acid. Monatsh Chem 120, 899–906 (1989). https://doi.org/10.1007/BF00811129
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DOI: https://doi.org/10.1007/BF00811129