Preparation of 1-fluoroglycosides from 1-arylthio and 1-arylselenoglycosides using 4-methyl(difluoroiodo)benzene
摘要:
Treatment of readily available thio- and selenoglycosides with the reagent 4-methyl(difluoroiodo)benzene leads to the formation of the corresponding fluoroglycosides in moderate to good yield.
Chemical synthesis and isolation of UDP-2-deoxy glucose and galactose
作者:Atsushi Miyagawa、Shunya Takeuchi、Shinji Itoda、Sanami Toyama、Kenta Kurimoto、Hatsuo Yamamura、Yukishige Ito
DOI:10.1080/00397911.2016.1227849
日期:2016.11.16
donors for glycosyltransferases were obtained α-selectively via phosphorylation using thioglycosides, coupling reaction with uridine-5′-monophosphate (UMP)-morpholidate, and moderate deacetylation. Isolation was carried out by sequential silica-gel chromatography using two kinds of developing solvents in a refrigerator. The structures were elucidated from the NMR results. Investigation of stability showed
Gold(I)-Catalyzed Glycosylation with Glycosyl Ynenoates as Donors
作者:Xiaona Li、Chenyu Li、Rongkun Liu、Jiazhe Wang、Zixuan Wang、Yan Chen、You Yang
DOI:10.1021/acs.orglett.9b03851
日期:2019.12.6
A simple and versatile glycosylation method with both armed and disarmed glycosyl ynenoates as donors is developed. Employing a gold(I) complex as catalyst with or without the assistance of TfOH, the scope of the present glycosylation protocol is very wide. The utility of the present ynenoate donors is demonstrated in the efficient synthesis of oligosaccharides via the latent-active strategy and the
Chemistry of β-trimethylsilylethanol. II. A new method for protection of an anomeric center in pyranosides
作者:Bruce H. Lipshutz、Joseph J. Pegram、Matthew C. Morey
DOI:10.1016/s0040-4039(01)82992-0
日期:1981.1
Protection of the anomeric center in various carbohydrates as a β-trimethylsilylethyl glycoside is reported. The free sugar can be regenerated using LiBF4 in acetonitrile.
Gold(I)-Catalyzed Glycosylation with Glycosyl<i>ortho</i>-Alkynylbenzoates as Donors: General Scope and Application in the Synthesis of a Cyclic Triterpene Saponin
coupling with the poorly nucleophilic amides gives satisfactory yields. Moreover, excellent α‐selective glycosylation with a 2‐deoxysugar donor and β‐selective sialylation have been realized. Application of the present glycosylation protocol in the efficient synthesis of a cyclic triterpene tetrasaccharide have further demonstrated the versatility and efficacy of this new method, in that a novel chemoselective
Additive‐Free Gold(III)‐Catalyzed Stereoselective Synthesis of 2‐Deoxyglycosides Using Phenylpropiolate Glycosides as Donors
作者:Mukta Shaw、Amit Kumar
DOI:10.1002/asia.201900888
日期:2019.12.13
Stereoselectivesynthesis of deoxyglycosides has been achieved from benchtop stable and easily synthesizable deoxy-phenylpropiolate glycosides (D-PPGs) using gold(III) salt as catalyst under external additive-free conditions. Under a simple catalytic system, D-PPGs reacted with a variety of sugar and non-sugar acceptors to produce majorly α-stereoselective O/N-deoxyglycosides in good to excellent yields