153658-76-5Relevant academic research and scientific papers
Glycosyl Phosphites as Glycosylation Reagents: Scope and Mechanism
Kondo, Hirosato,Aoki, Shin,Ichikawa, Yoshitaka,Halcomb, Randall L.,Ritzen, Helena,Wong, Chi-Huey
, p. 864 - 877 (2007/10/02)
The glycosylation reactions with glycosyl phosphites in the presence of catalytic amounts of TMSOTf at low temperature have been studied with different donors and acceptors for the synthesis of several glycosides, including O-glycosides, S-glycosides, C-glycosides, and glycopeptides.Mechanistic investigations of the reactions indicate that the glycosyl phosphite is activated by either TfOH or TMSOTf, depending on how the substrates are mixed.When the acceptor is treated with TMSOTf first, the glycosyl phosphite is activated by the resulting TfOH.The glycosyl phosphite can also be activated by TMSOTf directly.The best result is, however, to mix the acceptor and TMSOTf first, followed by addition of the glycosyl phosphite.
Synthesis and use of glycosyl phosphites: An effective route to glycosyl phosphates, sugar nucleotides, and glycosides
Sim, Mui Mui,Kondo, Hirosato,Wong, Chi-Huey
, p. 2260 - 2267 (2007/10/02)
An efficient and convenient synthetic route to glycosyl phosphites and phosphates has been developed that uses dibenzyl N,N-diethylphosphoramidite as a phosphitylating reagent. Glycosyl phosphites and phosphates of 2-acetamido-2-deoxy-D-galactose (GalNAc) (29), 2-acetamido-2-deoxy-D-glucose (GlcNAc) (30), D-galactose (Gal) (31), D-glucose (Glc) (32), D-mannose (Man) (33), L-rhamnose (Rha) (34), L-fucose (Fuc) (35), and N-acetylneuraminic acid (NeuAc) (41) were prepared by this procedure. Compounds 29 and 30 were obtained as α anomers exclusively, whereas compounds 31, 32, and 41 were obtained as β anomers, and compounds 33 and 34, as α anomers, predominately. The phosphates are useful for the synthesis of sugar nucleotides, and the phosphites are effective glycosylation reagents.
