Application of Halide Molten Salts as Novel Reaction Media for O-Glycosidic Bond Formation
作者:Vineet Kumar、Ian Jamie Talisman、Sanjay V. Malhotra
DOI:10.1002/ejoc.201000188
日期:——
we have explored the application of halide molten salts as reaction media for O-glycosidic bond formation under basic conditions and mild heating. Eighteen different room-temperature ionic liquids and molten salts, representing four different classes of cations (i.e. imidazolium, pyridinium, pyrrolidinium and ammonium), were screened in the glycosidation reaction of p-nitrophenol with aceto-bromo-α-D-galactose
O-Glycosidation reactions promoted by in situ generated silver N-heterocyclic carbenes in ionic liquids
作者:Ian Jamie Talisman、Vineet Kumar、Jacqueline Razzaghy、Sanjay V. Malhotra
DOI:10.1016/j.carres.2011.03.007
日期:2011.5
We herein report O-glycosidation reactions promoted via silver N-heterocyclic carbene complexes formed in situ in ionic liquids. Seven different room temperature ionic liquids were screened for the glycosidation reaction of 4-nitrophenol with tetra-O-acetyl-alpha-D-galactopyranosyl bromide. Good to excellent yields were obtained using Ag-NHC complexes derived from imidazolium halide salts to promote the glycosidation reaction, whereas yields considered moderate to low were obtained without use of the silver carbene complex. Anion metathesis of the ionic liquids with inexpensive alkylammonium halides also resulted in silver N-heterocyclic carbene formation and subsequent O-glycosidation in the presence of silver carbonate. Effective utility of this methodology has been demonstrated with biologically relevant acceptors (including flavones and steroids) where O-beta-glycoside products were obtained selectively in moderate to good yields. We have also demonstrated that the Ag-NHC complex is a superior promoter to traditionally used silver carbonate for the glycosidation of polyphenolic acceptors. The ionic liquids used in the study could be recycled three times without apparent loss in activity. (C) 2011 Published by Elsevier Ltd.
COMPOUNDS AND METHODS FOR TREATING BACTERIAL INFECTIONS
申请人:Washington University
公开号:US20210171563A1
公开(公告)日:2021-06-10
The present invention is directed to various compounds, compositions, and methods for treating bacterial infections such as urinary tract infections.