Partially benzylated oxazoline derivatives of 2-acetamido-2-deoxy-D-glucopyranose as “standardized intermediates” for oligosaccharide synthesis. preparation of disaccharides having the sequences β-D-GlcpNAc(1→x)-D-Gal and β-D-GlcpNAc(1→4)-D-GlcNAc
作者:Mina A. Nashed、Makoto Kiso、Charles W. Slife、Laurens Anderson
DOI:10.1016/s0008-6215(00)85613-x
日期:1981.3
were fully substituted disaccharides of 2-acetamido-2-deoxy-β- D -glucose linked 1→3 (9a), 1→6 (11a), 1→4 (14a), and 1→4 (17a), respectively. Cleavage of the single, temporary protecting group (O-acetyl) from these compounds gave partially deblocked disaccharides capable of chain extension from position 3′ (9b and 11b) or 4′ (14b and 17b).
摘要从相应的O-酰基三-O-苄基-D-半乳糖吡喃糖基溴化物(1a-c)中通过三氯甲烷制得了三个苄基三-O-苄基-1-硫代-β-D-吡喃半乳糖苷(5、6和7)。黄原酸苄酯2a-c和完全保护的苄基硫代半乳糖苷3a-c。溴化物1a与α-甲苯硫醇的反应产生了5的α异头物(4)。发现成功偶联2-甲基-(1,2-二脱氧-α-D-吡喃吡喃)-[2,1-d]-的O-乙酰基-二-O-苄基衍生物(8和13)的条件。 2-恶唑啉与硫代半乳糖苷5-7结合,并与部分保护的糖苷(16)或2-乙酰氨基-2-脱氧-D-葡萄糖结合。产物是2-乙酰氨基-2-脱氧-β-D-葡萄糖连接的1→3(9a),1→6(11a),1→4(14a)和1→4(17a)的完全取代的二糖,分别。劈裂的单身,