Preparation of anomeric pairs of 1-thioglycosides: use of anomerization catalyzed by boron trifluoride
作者:Daniel T. Connolly、Saul Roseman、Yuan C. Lee
DOI:10.1016/s0008-6215(00)85209-x
日期:1980.12
Abstract Anomeric pairs of some alkyl 1-thioaldopyranosides of d -galactose, d -glucose, d -mannose, 2-acetamido-2-deoxy- d -glucose, 2-acetamido-2-deoxy- d -galactose, and l -fucose were prepared. The per- O -acetylated, 1,2- trans anomers of 6-(trifluoroacetamido)hexyl 1-thioaldopyranosides and 5-(methoxycarbonyl)pentyl 1-thioaldopyranosides were anomerized with boron trifluoride in dichloromethane. The
摘要d-半乳糖,d-葡萄糖,d-甘露糖,2-乙酰氨基-2-脱氧-d-葡萄糖,2-乙酰氨基-2-脱氧-d-半乳糖和l-岩藻糖的一些烷基1-硫代醛吡喃糖苷的端基对准备好了。用三氟化硼在二氯甲烷中使6-(三氟乙酰胺基)己基1-硫代吡喃吡喃糖苷和5-(甲氧基羰基)戊基1-硫代吡喃吡喃糖苷的过-O-乙酰化的1,2-反式异构体。然后使用硅胶或离子交换树脂柱通过色谱分离异头混合物。分离的化合物的解封闭提供了6-氨基己基1-硫代吡喃二糖苷或5-羧基戊基1-硫代吡喃二糖苷的纯异构体。后一种糖苷的糖苷配基通过与氨基乙醛二乙缩醛反应而进一步延伸,在产物脱缩醛化后提供ω-醛基。