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Studies on Carbohydrate Xxxii-Chemoselective Synthesis of Mannosamine Glycosides Through Non-Regioselective Azidonitration of Lactal

机译:乳糖的非区域选择性叠氮硝化反应对糖胺糖苷进行糖Xxxii化学选择性合成的研究

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摘要

The mixture of 3,6-di-acetyl-4-O-(2,3,4,6-tetra-O-acetyl-#beta#-D-galactopyranosyl)-2-deoxy-D-glucopyranosyl azido-2-deoxy-D-glucopyranosyl acetates or trichloroacetates and the corresponding mannose type glycosyl donors reacted with spacer arms of di-and triethylene glycol in the solution of dichloromethane with BF_3 centre dot Et-2O and TMSOTf as promoters at room temperature gave highly selective products. Only the mannose type products were obtained. In addition, some lactose type compounds can be prepared by another way.
机译:3,6-二乙酰基-4-O-(2,3,4,6-四-O-乙酰基-#beta#-D-吡喃半乳糖基)-2-脱氧-D-吡喃葡萄糖基叠氮基-2-的混合物在室温下,以BF_3中心点Et-2O和TMSOTf为促进剂,脱氧D-葡萄糖基吡喃糖基乙酸酯或三氯乙酸酯和相应的甘露糖型糖基供体与二甘醇和三甘醇的间隔臂在二氯甲烷溶液中反应,得到高选择性的产物。仅获得甘露糖型产品。另外,一些乳糖型化合物可以通过另一种方法制备。

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