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Synthesis and structure determination of some nonanomerically C—C-linked serine glycoconjugates structurally related to mannojirimycin

Julia Micova ; Bohumil Steiner ; Miroslav Koos ; Vratislav Langer (Institutionen för oorganisk miljökemi) ; Dalma Gyepesova
Carbohydrate Research (0008-6215). Vol. 339 (2004), 13, p. 2187-2195.
[Artikel, refereegranskad vetenskaplig]

The Bucherer–Bergs reaction of methyl 2,3-O-isopropylidene-α-D-lyxo-hexofuranosid-5-ulose gave (4′S)-4′-carbamoyl-4′-[methyl (4R)-2,3-O-isopropylidene-β-L-erythrofuranosid-4-C-yl]-oxazolidin-2′-one instead of expected hydantoins. A mixture of hydantoins––(5′R)-triphenylmethoxymethyl-5′-[methyl (4R)-2,3-O-isopropylidene-β-L-erythrofuranosid-4-C-yl]-imidazolidin-2′,4′-dione and (5′S)-triphenylmethoxymethyl-5′-[methyl (4R)-2,3-O-isopropylidene-β-L-erythrofuranosid-4-C-yl]-imidazolidin-2′,4′-dione was obtained from the 5-ulose having protected primary OH group at C-6. The 4′-S configuration of 2 as well as 5′-S configuration of (5′S)-hydroxymethyl-5′-[methyl (4R)-2,3-O-isopropylidene-β-L-erythrofuranosid-4-C-yl]-imidazolidin-2′,4′-dione (9) was confirmed by X-ray crystallography. Corresponding α-amino acid––methyl (5S)-5-amino-5-C-carboxy-5-deoxy-α-D-lyxo-hexofuranoside (alternative name: 2-[methyl (4R)-β-L-erythrofuranosid-4-C-yl]-L-serine) (11) was obtained from the hydantoin 9 by acid hydrolysis of the isopropylidene and trityl groups followed by basic hydrolysis of the hydantoin ring. Analogous derivatives with 5-R configuration, formed in a minority, were also isolated and characterised.

Nyckelord: Sugar amino acids, Hydantoins, Serine, Bucherer–Bergs reaction, Mannojirimycin, X-ray crystallography, Conformation

Denna post skapades 2006-08-29. Senast ändrad 2013-06-04.
CPL Pubid: 1551


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