Preparation of oligosaccharides with β-d-mannopyranosyl and 2-azido-2-deoxy-β-d-mannopyranosyl residues by inversion at C-2 after coupling
作者:Serge David、Annie Malleron、Christophe Dini
DOI:10.1016/0008-6215(89)84070-4
日期:1989.6
unit were prepared by coupling 1,2,4,6-tetra-O-acetyl-3-O-benzyl-β- d -glucopyranose (1) to suitably, partially benzylated, acceptor sugar derivatives. Deacetylation followed by acetalation gave 3-O-benzyl-4,6-O-benzylidene-β- d -glucopyranosyl derivatives which were treated with N,N′-sulfuryldi-imidazole. The resulting 2-imidazylate group was displaced easily with inversion by benzoate or azide, leading
摘要通过偶联1,2,4,6-四-O-乙酰基制备了具有2,4,6-三-O-乙酰基-3-O-苄基-β-d-吡喃葡萄糖基单元的二糖和三糖-3-O-苄基-β-d-吡喃葡萄糖(1)适当地被部分苄基化的受体糖衍生物。脱乙酰基,然后乙缩醛化,得到3-O-苄基-4,6-O-亚苄基-β-d-吡喃葡萄糖基衍生物,其用N,N'-磺酰基二咪唑处理。所得的2-亚酰胺基容易被苯甲酸酯或叠氮化物转化而被置换,分别导致β-d-甘露吡喃糖基或2-叠氮基-2-脱氧-β-d-甘露吡喃糖基衍生物。β-d -Manp-(1→4)-d -Glc,β-d -Manp-(1→4)-d -Man,β-d -Manp-(1→4)-β-d的保护衍生物-Manp-(1→4)-d -Glc,2-叠氮基-2-脱氧-β-d-Manp-(1→4)-d-Glc和2-叠氮基-2-脱氧-β-d-由此制备了Manp-(1→6)-d-Glc。