Synthetic Studies on Sialoglycoconjugates 23: Total Synthesis of Sialyl-α(2↠6)-Lactotetraosylceramide and Sialyl-α(2↠6)-Neolactotetraosylceramide
Synthetic Studies on Sialoglycoconjugates 23: Total Synthesis of Sialyl-α(2↠6)-Lactotetraosylceramide and Sialyl-α(2↠6)-Neolactotetraosylceramide
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唾液酸糖缀合物的合成研究23:唾液酸-α(2↠6)-乳四糖神经酰胺和唾液酸-α(2↠6)-新乳四糖神经酰胺的全合成
DOI:
10.1080/07328309108543920
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发表时间:
1991
影响因子:
1
通讯作者:
M. Kiso
中科院分区:
文献类型:
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作者:
A. Hasegawa;K. Hotta;A. Kameyama;H. Ishida;M. Kiso
ABSTRACT The first total syntheses of sialyl-α(2→6)-lactotetraosylceramide (29, IV6NeuAcLc4Cer) and sialyl-α(2→6)-neolatotetraosylceramide (33, IV6NeuAcnLc4Cer) are described. Methyl O-(methyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-D-glycero-α-D-galacto-2-nonulopyranosylonate)-(2→6)-2,4-di-O-benzoyl-3-O-benzyl-1-thio-s-D-galactopyranoside (11), the key glycosyl donor was prepared, via glycosylation of 2-(trimethylsilyl)ethyl 3-O-benzyl-s-D-galactopyranoside (2) with the methyl α-thioglycoside 3 of N-acetylneuraminic acid, benzoylation, replacement of the 2-(trimethylsilyl)ethyl group by acetyl, and introduction of the methylthio group with (methylthio)trimethylsilane. Each coupling of 2-(trimethylsilyl)ethyl O-(2-acetamido-4,6-O-benzylidene-2-deoxy-s-D-glucopyranosyl)-(1→3′)-per-O-benzyl-s-lactoside (12) or 2-(trimethylsilyl)ethyl O-(2-acetamido-3-O-acetyl-6-O-benzyl-2-deozy-s-D-glucopyranosyl)-(1→3′)-per-O-benzyl-s-D-lactoside (14) prepared from 12 by O-acetylation and reductive opening of the be...
DOI:
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发表时间:
1990
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Tiemeyer,M;Swank-Hill,P;Schnaar,RL
通讯作者:
Schnaar,RL