Synthesis of methyl pyranosides and furanosides of 3-deoxy-d-manno-oct-2-ulosonic acid (KDO) by acid-catalysed solvolysis of the acetylated derivatives
作者:Paul A. McNicholas、Michael Batley、John W. Redmond
DOI:10.1016/0008-6215(86)85041-8
日期:1986.2
Treatment of methyl 2,4,5,7,8-penta-O-acetyl-3-deoxy-alpha-D-manno-oct- 2-ulopyranosonic acid, or its methyl ester, with refluxing methanolic 0.1 M hydrogen chloride for 16 h gave 95% of methyl (methyl 3-deoxy-alpha-D-manno-oct-2-ulopyranosid)onate. Acetylation of the methyl ester of 3-deoxy-D-manno-oct-2-ulosonic acid (KDO) gave mainly methyl 2,4,6,7,8-penta-O-acetyl-3-deoxy-alpha,beta-D-manno-oct-2-ulofuranoso
用回流的甲醇0.1 M氯化氢处理甲基2,4,5,7,8-戊基-O-乙酰基3-脱氧-α-D-甘露聚糖-辛基-2-氟吡喃磺酸或其甲酯h得到95%的甲基(3-脱氧-α-D-甘露聚糖-辛基-2-氟吡喃糖苷)甲基酸酯。3-脱氧-D-甘露聚糖-辛-2-磺酸的甲酯的乙酰化(KDO)主要产生甲基2,4,6,7,8-五-O-乙酰基-3-脱氧-α,β- D-甘露聚糖-oct-2-ulofuranoso。在室温下用0.02M甲醇的甲醇溶液处理该混合物,得到(3-脱氧-α,β-D-甘露辛基-辛-2-氟呋喃糖苷)甲基丙烯酸酯和相应的4-乙酸酯,其通过反相柱分离。的7,8-O-异亚丙基衍生物的色谱分析。通过乙酰化得到异亚丙基的位置,得到甲基(甲基4,6-二-O-乙酰基-3-脱氧-7,8-O-异亚丙基-α,β-D-甘露聚糖-oct-2-ul呋喃糖苷)。呋喃糖异构体的主要区别在于J3,4值(α约为6.1 Hz,β约为2.2