Ristosamine, an amino sugar derived from the antibiotic ristomycin A, is shown to be the previously unreported 3-amino-2,3,6-trideoxy-L-n'bo-hexopyranose.Ristomycin, an antibiotic produced by Proactinomyces fructiferi var. ristomycin,1 exhibits a wide antibacterial spectrum2 and can be classified among the vancomycintype antibiotics.3 Ristomycin is composed of the variants A and B, each of which gives rise to the same, previously unreported, ninhydrin-positive, reducing deoxy amino sugar under conditions of acidic or alkaline hydrolysis.4In a previous report5 we have described the neutral carbohydrates attached to ristomycin A aglycone, and the par-
Durch Kondensation von L‐Cystein mit Monosacchariden erhält man 2‐Polyhydroxyalkyl‐thiazolidin‐carbonsäuren‐(4) (Tab.1) und daraus Peracetyl‐Verbindungen und deren Methyl‐ester (Tabb. 2 und 3). Die Reaktionsmöglichkeiten und die Struktur dieser Verbindungen werden am Beispiel der Kondensationsprodukte von L‐Cystein bzw. dessen Methylester mit D‐Galaktose und Pentaacetyl‐al‐D‐galaktose sowie ihren Umwandlungsprodukten untersucht.
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