A mild general method for the synthesis of ∝-linked disaccharides
作者:G.Venugopal Reddy、Vinayak R. Kulkarni、Hari Babu Mereyala
DOI:10.1016/s0040-4039(01)80711-5
日期:1989.1
Stereoselective ∝-glycosylations may be achieved using stable 2-pyridyl thioglycosides (anomeric mixture) having a non-participating 2-substituent as glycosyldonor and methyl iodide as an activator.
Glycosyl iodides are highly efficient donors under neutral conditions
作者:Michael J. Hadd、Jacquelyn Gervay
DOI:10.1016/s0008-6215(99)00146-9
日期:1999.7
Abstract Glycosyliodides have been prepared and subjected to glycosylation underneutralconditions. The reactions are highly efficient, giving α glycosides even with sterically demanding glycosyl acceptors. Glucosyl iodides react with allyl alcohol slowest and require refluxing conditions. Galactosyl iodides are intermediate in reactivity, providing the allyl glycoside in 3 h at room temperature
Stereoselective fucosylation of Boc-Ser/Thr/Tyr-OMe 2â4 and several saccharide alcohols 5â7 by coupling with 2-pyridyl tri-O-benzyl-1-thio-β-L-fucosyl donor 1b under iodomethane activation procedure results in the formation of α-linked fucosylated amino acid methyl ester building blocks 8â10 and α-linked fucosyl saccharides 11â13, respectively.