Deoxygenative Olefination Reaction as the Key Step in the Syntheses of Deoxy and Iminosugars
作者:Yung Chang Hsu、Jih Ru Hwu
DOI:10.1002/chem.201201060
日期:2012.6.18
Just a spoonful of sugar! A new synthetic strategy involving the use of a deoxygenative olefination reaction as the key step was developed for the preparation of deoxy and iminosugars in their optically active form (see scheme). This strategy has been proven successful by the use of a pentose, hexose, heptose, and disaccharide as the starting materials. Furthermore, it was applied in a formal total
SUGAR CHAIN CONTAINING 4-POSITION HALOGENATED GALACTOSE AND APPLICATION THEREOF
申请人:Nishimura Shin-Ichiro
公开号:US20090018327A1
公开(公告)日:2009-01-15
The present invention is directed to, for example, an oligosaccharide having at an end thereof a 4-position halogenated galactose residue represented by formula (I):
(wherein X represents a halogen atom, and R represents a monosaccharide, an oligosaccharide, or a carrier), a transferase inhibitor containing the oligosaccharide, and a method for inhibiting sugar chain elongation reaction in the presence of glycosyltransferase, the method including employing the inhibitor.
The invention also provides a method for producing a 4-position halogenated galactose sugar nucleotide represented by formula (II):
(wherein each of R
1
to R
3
represents a hydroxyl group, an acetyl group, a halogen atom, or a hydrogen atom; X represents a halogen atom; and M represents a hydrogen ion or a metal ion), wherein the method employs bacterium-derived galactokinase and bacterium-derived hexose-1-phosphate uridylyltransferase.
The invention is also directed to a sugar chain containing 4-position halogenated galactose envisaged to be employed as drugs and other materials, and to applications of the compound.
A Convenient Route to Higher Sugars by Two-Carbon Chain Elongation Using Wittig/Dihydroxylation Reactions
作者:Morten Jørgensen、Erik H. Iversen、Robert Madsen
DOI:10.1021/jo010128e
日期:2001.6.1
rule and gives high diastereoselectivity (5:1-8:1) when starting from sugars with the 2,3-threo configuration. When starting from sugars with the 2,3-erythro configuration, the diastereoselectivity in the dihydroxylation is low (2:1-2.5:1). As a result, the Wittig/dihydroxylation protocol is most effective for producing highersugars with the galacto configuration at the reducing end. The two steps can
Structural studies of the antigenic polysaccharide of Eubacterium saburreum, strain T27
作者:Wataru Kondo、Futoshi Nakazawa、Michiko Sato、Teiichiro Ito
DOI:10.1016/0008-6215(83)88081-1
日期:1983.6
The antigenicpolysaccharide produced by Eubacteriumsaburreum, strainT27, is a homoglycan composed of D-glycero-D-galacto-heptose (Hep) residues having a nonasaccharide repeating-unit with the structure (leads to 6)-[alpha-Hepf-(1 leads to 4)]-beta-Hepp-(1) leads to (3)6)-[alpha-Hepf-(1 leads to 2), alpha-Hepf-(1 leads to 4)]-beta-Hepp-(1 leads to. The polysaccharide contains acetyl groups linked
THERMOPLASTIC POLYMER COMPOSITION AND PROCESSING STABILISER
申请人:Kimura Yoshikazu
公开号:US20130032756A1
公开(公告)日:2013-02-07
The present invention provides a thermoplastic polymer composition containing a particular phenol compound or organic phosphoric compound, compound (9) which is compound (9a) represented by C
m
H
2m
O
m
wherein m is an integer of not less than 3 and not more than 10, and having one aldehyde group or ketone group and m−1 hydroxy groups with at least one hydroxy group having been replaced by an alkoxy group represented by —OR
26
wherein R
26
is a C
1-12
alkyl group, and a thermoplastic polymer, and a processing stabilizer containing a particular phenol compound or organic phosphoric compound, and compound (9). A combined use of a particular phenol compound or organic phosphoric compound and compound (9) can improve processing stability of a thermoplastic polymer composition.