4258-14-4Relevant articles and documents
Efficient Synthesis of α-Glycosyl Chlorides Using 2-Chloro-1,3-dimethylimidazolinium Chloride: A Convenient Protocol for Quick One-Pot Glycosylation
Tatina, Madhu Babu,Khong, Duc Thinh,Judeh, Zaher M. A.
supporting information, p. 2208 - 2213 (2018/06/04)
A mild and convenient method for the synthesis of α-glycosyl chlorides in high 80–96 % yields within 15–30 min using 2-chloro-1,3-dimethylimidazolinium chloride (DMC) is disclosed. The method has a wide substrate scope and is compatible with labile OH protecting groups, including benzyl, acetyl, benzoyl, isopropylidene, benzylidene, TBDMS (tert-butyldimethylsilyl), and TBDPS (tert-butyldiphenylsilyl) groups. The excellent α selectivity obtained in this reaction is attributed to in-situ isomerization of β-glycosyl chlorides to the more stable α-glycosyl chlorides, as demonstrated by 1H NMR spectroscopic studies. Disarmed sugars with OBz or OAc groups at C-2 were chlorinated at a faster rate but ismomerized (β→α) at a slower rate than armed sugars with an OBn group at C-2. More importantly, the method enables highly desirable one-pot glycosylation reactions to take place, thus allowing efficient syntheses of disaccharides and simple O-glycosylated sugars in high overall yields without the need for separation or purification of the α-glycosyl chloride donors. This method will be especially useful for direct glycosylation reactions using glycosyl chloride donors that are unstable upon separation and purification.
An environmentally benign and practical synthesis of sugar orthoesters promoted by potassium fluoride
Shoda, Shin-Ichiro,Moteki, Masashi,Izumi, Ryuko,Noguchi, Masato
, p. 8847 - 8848 (2007/10/03)
An extremely practical method for synthesis of sugar orthoesters has been developed without using any organic amines or heavy metals as additives. Various sugar orthoesters were prepared in good yields by the reaction of an acylated glycosyl bromide and a
SYNTHESIS OF LINEAR D-MANNOTETRAOSE AND D-MANNOHEXAOSE, PARTIAL STRUCTURES OF THE CELL-SURFACE D-MANNAN OF Candida albicans AND Candida utilis
Ogawa, Tomoya,Yamamoto, Hisao
, p. 271 - 284 (2007/10/02)
Syntheses of linear D-manno-oligosaccharides, O-α-Man-(1-2)-O-α-Man-(1-2)-O-α-Man-(1-2)-Man and O-α-Man-(1-2)-O-α-Man-(1-2)-O-α-Man-(1-2)-O-α-Man-(1-2)-Man, which correspond to part of the structure of the cell-wall D-mannan chain of Candida utilis and Ca