Fluorine-Directed β-Galactosylation: Chemical Glycosylation Development by Molecular Editing
作者:Estelle Durantie、Christoph Bucher、Ryan Gilmour
DOI:10.1002/chem.201200468
日期:2012.6.25
Validation of the 2‐fluoro substituent as an inert steering group to control chemicalglycosylation is presented. A molecularediting study has revealed that the exceptional levels of diastereocontrol in glycosylation processes by using 2‐fluoro‐3,4,6‐tri‐O‐benzyl glucopyranosyl trichloroacetimidate (TCA) scaffolds are a consequence of the 2R,3S,4S stereotriad. This study has also revealed that epimerization
A method for photochemical activation of glycosyl donors is presented. Selenoglycosides were activated by single-electron transfer using a photooxidant, N-methylquinolinium hexafluorophosphate, as photosensitizer and a toluene cosolvent as cosensitizer under irradiation at 350 nm. In this way we were able to synthesize glycosides including (1 -> 6)-linked disaccharides. Benzyl ethers and benzoate esters were compatible with these conditions, allowing potentially synthetically useful transformations. The major by-products were due to hydrolysis; the reactions required the presence of oxygen and were run in air.
KALININ, V. I.;STONIK, V. A.;KALINOVSKIJ, A. I.;ISAKOV, V. V., XIMIYA PRIROD. SOED.,(1989) N, S. 678-684
作者:KALININ, V. I.、STONIK, V. A.、KALINOVSKIJ, A. I.、ISAKOV, V. V.