Synthesis of branched d-xylofuranan by selective, ring-opening polymerization of silylated 1,5-anhydro-β-d-xylofuranose, and its conversion into a blood anticoagulant
作者:Takashi Yoshida、Toshiyuki Arai、Yasuyoshi Mukai、Toshiyuki Uryu
DOI:10.1016/0008-6215(88)85042-0
日期:1988.6
mannose 1,2-(methyl orthoacetate) to give a branched polymer. Deprotection of the benzylated polymer having D-mannosyl branches with sodium in liquid NH3 gave (1----5)-alpha-D-xylofuranans having 2- or 3-O-alpha-D-mannopyranosyl branches. Sulfation of the free D-xylofuranans was achieved with piperidine sulfate. The sulfated D-xylofuranan having branches showed high blood-anticoagulant activity.
研究了1,5-脱水-D-木呋喃糖衍生物的选择性开环聚合和共聚。由一种新的单体1,5-脱水-2,3-二-O-(叔丁基二甲基甲硅烷基)-β-D-木呋喃糖合成立体异构(1 ---- 5)-α-D-木呋喃聚糖五氟化物和五氯化锑在二氯甲烷中的催化剂。3与1,5-脱水-2,3-二-O-苄基-β-D-木呋喃糖的共聚反应,以及共聚物与四丁基氟化铵的甲硅烷基化反应,得到部分苄基化的立体有规(1 ---- 5)-α-用3,4,6-三-O-乙酰基-β-D-甘露糖1,2-(原乙酸甲酯)糖基化的D-木呋喃聚糖,得到支链聚合物。在液体NH 3中用钠对具有D-甘露糖基支链的苄基化聚合物进行脱保护,得到具有2-或3-O-α-D-甘露吡喃糖基支链的(1-5)-α-D-木呋喃聚糖。用硫酸哌啶将游离的D-二木呋喃聚糖硫酸化。具有分支的硫酸化的D-木呋喃聚糖显示出高的血液抗凝活性。