【摘 要】
:
The O-glycosylation method has been of particular interest due to the rapid development of synthetic and biological studies of oligosaccharides and natural prod
【机 构】
:
SchoolofChemicalEngineeringandLightIndustry,GuangdongUniversityofTechnology,Guangzhou,510006
【出 处】
:
第五届岭南有机化学论坛暨华南理工大学-兰州大学有机化学双边论坛
论文部分内容阅读
The O-glycosylation method has been of particular interest due to the rapid development of synthetic and biological studies of oligosaccharides and natural products containing sugar motifs.A variety of glycosylation methods have been developed such as using glycosyl halides,thioglycosides,1-O-acyl sugars,orthoesters,1-O-and S-carbonates,glycosyl imidates,4-pentenyl glycosides,phosphate/phosphite derivatives,sulfoxides,1-O-silylated glycosides,1,2-anhydrosugars,1-hydroxyl sugars,glycals,and glycosyl ortho-alkynylbenzoates as glycosyl donors.However,to our knowledge,most of glycosyl donors are unable to be activated with a catalytic amount of promoters.Development of a novel O-glycosylation method,especially activated with catalysts,is still in demand.Herein,we describe a mild,efficient and diastereoselective Au(Ⅲ)-and Ag(Ⅰ)-catalyzed O-glycosylation with pyranones as the glycosyl donors,and the reactions smoothly give α-anomers in good yields with good diastereoselectivities under mild conditions.(Scheme 1).
其他文献
Multiphase fluid flows,such as sprays and liquid jets,are common processes in Internal Combustion and Gas Turbine engines.Liquid fuel is injected into the c
In typical passenger car diesel engines,multi-hole nozzles with small spray hole diameters are advantageous under low and part load conditions due to improv
Among submanifolds,hypersurfaces are particularly important for geometric analysis as they arise as boundaries of domains and manifolds.We discuss the treat
In this paper, at first, we obtain a necessary condition of H -càdlàg modification and H -weakly càdlàg modification of generalized Ornstein-Uhlenbeck p
I will talk about several Sobolev inequalities for CR geometry in 3-D.Each one is related with conformally covariant operators and its associated curvature.
Metal carbenes derived from transition metal-catalyzed decomposition of diazo compounds react with nucleophiles with heteroatoms,such as alcohols and amines,to
The application of biocatalysts in catalysis is attracting more and more attention in the field of chemistry.Bovine serum albumin(BSA),which is a ubiquitous and
Natural product synthesis has played a prominent role in the development of the field of organic chemistry by providing a challenging platform for the discovery
The ent-kaurenoids are the major component of Isodon diterpenes and exhibited a wide range of biological activities,such as anti-bacteria,anti-cancer and immuno
Organic electroluminescence materials with wide viewing angle,low power consumption,fast response,simple process,achieve the full color display.It have be used