title: Synthesis of 1D-(1,3,5/2,4)-4-acetamido-5-amino-1,2,3-cyclohexanetriol and its incorporation into a pseudo-disaccharide.
abstract: The synthesis of the title compound and 1D-(1,3,5/2,4)-4-acetamido-5-amino-3-O-(beta-D-glucopyranosyluronic acid)- 1,2,3-cyclohexanetriol [sequence: see text] is described. Starting from methyl 2-acetamido-2-deoxy-alpha-D-glucopyranoside 2L-(2,4,5/3)-4-acetamido-3-benzoyloxy-2-benzyloxy-5- hydroxycyclohexanone [sequence: see text] was prepared via a series of transformations including the regioselective ring opening of the benzylidene acetal and the mercury(II)-catalyzed carbocyclic ring closure reaction of 5-enopyranoside. Stereoselective reduction of ketone 11 with NaBH(OAc)3 gave 1D-(1,2,4/3,5)-2-acetamido-3-O-benzoyl-4-O-benzyl-1,3,4,5- cyclohexanetetrol [sequence: see text] (88%), which was then converted into 1D-(1,3,5/2,4)-4-acetamido-5-azido-3-O-benzoyl-2-O- benzyl-1-O-pivaloyl-1,2,3-cyclohexanetriol [sequence: see text] through selective 5-OH protection, 1-O-mesylation, and subsequent azide displacement. Saponification and hydrogenation of this gave the title compound. Selective O-debenzoylation with 1.1 equiv of K2CO3 in MeOH gave 1D-(1,3,5/2,4)-4-acetamido-5-azido-2-O-benzyl-1-O- pivaloyl-1,2,3-cyclohexanetriol [sequence: see text] (73%). Glycosylation of this compound with methyl (2,3,4-tri-O-acetyl-alpha-D-glucopyranosyl bromide) uronate in Ch2Cl2, using silver triflate as the promoter, afforded 1D-(1,3,5/2,4)-4-acetamido-5-azido-2-O-benzyl-3-O-(methyl 2,3,4-tri-O-acetyl-beta-D-glucopyranosyluronate)-1-O- pivaloyl-1,2,3-cyclohexanetriol [sequence: see text] and subsequent hydrogenation of this compound gave the basic pseudo-disaccharide.
authors.affiliation: Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences.
authors.forename: L X
authors.initials: LX
authors.lastname: Wang
authors.forename: N
authors.initials: N
authors.lastname: Sakairi
authors.forename: H
authors.initials: H
authors.lastname: Kuzuhara
mesh_terms: D002240:Carbohydrate Sequence; D003511:Cyclohexanols / Q000138:chemical synthesis* / Q000737:chemistry; D004187:Disaccharides / Q000138:chemical synthesis* / Q000737:chemistry; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000737:chemistry; D005965:Glucuronates / Q000138:chemical synthesis* / Q000737:chemistry; D006031:Glycosylation; D006596:Hexosaminidases / Q000037:antagonists & inhibitors / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction
chemical_list: C096650:4-acetamido-5-amino-1,2,3-cyclohexanetriol; C096651:4-acetamido-5-amino-3-O-(glucopyranosyluronic acid)-1,2,3-cyclohexanetriol; D003511:Cyclohexanols; D004187:Disaccharides; D004791:Enzyme Inhibitors; D005965:Glucuronates; D006596:Hexosaminidases