[EN] METHOD OF PREPARATION OF 6-AZIDO-2,4-DIACETAMIDO-2,4,6-TRIDEOXY-D-MANNOSE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE 6-AZIDO-2,4-DIACÉTAMIDO-2,4,6-TRIDÉOXY-D-MANNOSE
申请人:CENTRE NAT RECH SCIENT
公开号:WO2017085145A1
公开(公告)日:2017-05-26
The invention relates to a method of preparation of 6-azido-2,4-diacetamido-2,4,6-trideoxy-D-mannose. This method comprises the chemical reaction of compound of formula (X). Wherein: R1 can be a C1 to C6 alkyl including methyl, ethyl, isopropyl; aryl including phenyl; each of these groups being substituted or not; and R2 can be a C1 to C6 alkyl including methyl, ethyl, isopropyl, te/t-butyl, isobutyl; each of these groups being substituted or not; with a deprotecting reagent comprising a Lewis or Bronsted acid in a polar aprotic solvent, thereby obtaining a free C-1 OH group. The method can also start with the preparation from commercially available D-galactose pentaacetate, D-galactose tetraacetate or tetraacetyl D-galactosyl trichloroacetimidate. According to the invention the step of deprotecting the anomeric position avoids the use of cerium and allows the easy purification of 6-azido-2,4-diacetamido-2,4,6-trideoxy-D-mannose.
该发明涉及一种制备6-叠氮基-2,4-二乙酰氨基-2,4,6-三去氧-D-甘露糖的方法。该方法包括化合物(X)的化学反应。其中:R1可以是C1到C6的烷基,包括甲基、乙基、异丙基;芳基,包括苯基;这些基团可以被取代或未取代;R2可以是C1到C6的烷基,包括甲基、乙基、异丙基、叔丁基、异丁基;这些基团可以被取代或未取代;与包含Lewis酸或Bronsted酸的脱保护试剂在极性无水溶剂中发生化学反应,从而获得一个自由的C-1 OH基团。该方法也可以从商业上可获得的D-半乳糖五乙酰基、D-半乳糖四乙酰基或四乙酰基D-半乳糖基三氯乙酰亚胺开始制备。根据该发明,去保护异构位置的步骤避免了使用铈,并且可以方便地纯化6-叠氮基-2,4-二乙酰氨基-2,4,6-三去氧-D-甘露糖。