Streptococcus pneumoniae type XIV polysaccharide: synthesis of a repeating branched tetrasaccharide with dioxa-type spacer-arms
作者:Paul-Henri Amvam-Zollo、Pierre Sinaÿ
DOI:10.1016/0008-6215(86)80016-7
日期:1986.8
beta-Glycosides of 2-acetamido-2-deoxy-D-glucopyranose were synthesised, using either 7-methoxycarbonyl-3,6-dioxa-1-heptanol or 8-azido-3,6-dioxa-1-octanol. Selective beta-lactosylation of 7-methoxycarbonyl-3,6-dioxaheptyl 2-acetamido-3-O-benzyl-2-deoxy-beta-D-glucopyranoside with hepta-O-acetyl-lactosyl-trichloroacetimidate, followed by beta-galactosylation of the secondary hydroxyl group with O-(2
使用7-甲氧基羰基-3,6-二氧杂-1-庚醇或8-叠氮基3,6-二氧杂-1-辛醇合成了2-乙酰氨基-2-脱氧-D-吡喃葡萄糖的β-糖苷。7-甲氧基羰基-3,6-二氧杂庚基2-乙酰氨基-3-O-苄基-2-脱氧-β-D-吡喃葡萄糖苷与七-O-乙酰基-乳糖基-三氯乙酰胺酸的选择性β-乳糖基化,然后β-半乳糖基化仲羟基与O-(2,3,4,6-四-O-乙酰基-α-D-吡喃半乳糖基)三氯乙酰亚胺基,催化氢解和O-脱乙酰化,得到7-甲氧基羰基-3,6-二氧杂庚基2 -乙酰氨基-2-脱氧-4-O-β-D-吡喃半乳糖基-6-O-(4-O-β-D-吡喃半乳糖基-β-D-吡喃葡萄糖基)-β-D-吡喃葡萄糖苷。8-azido-3的选择性β-乳糖基化