Direct Glycosylation of Unprotected and Unactivated Carbohydrates under Mild Conditions
作者:Matthias Pfaffe、Rainer Mahrwald
DOI:10.1021/ol203329u
日期:2012.2.3
Ligand exchange acetalization of acetals in the presence of catalytic amounts of mandelic acid and titanium tert-butoxide is reported. This transformation is successfully extended to glycosylation of unprotected and unactivated pentoses. Even unreactive pentoses such as d-arabinose or d-lyxose can be transformed by this new methodology into corresponding isopropyl glycosides.
Sulfonated graphene oxide as highly efficient catalyst for glycosylation
作者:Raju S. Thombal、Vrushali H. Jadhav
DOI:10.1080/07328303.2015.1120874
日期:2016.1.2
Heterogeneous sulfonated graphene oxide for the first time has been used as a green and efficient catalyst for atom-economic glycosylation of unprotected, unactivated glycosyl donors or 2,3,4,6-tetra-O-acetylglycosyltrichloroacetimidate with various acceptors basically in the absence of solvent. The unprotected, unactivated glycosyl donors afforded mixtures of α- and β-glycosides, while the 2,3,4,
Anomeric alkylations and acylations of unprotected mono- and disaccharides mediated by pyridoneimine in aqueous solutions
作者:Kalyan Dey、Narayanaswamy Jayaraman
DOI:10.1039/d1cc07056h
日期:——
A site-specific deprotonation followed by alkylations and acylations of sugar hemiacetals to the corresponding alkyl glycosides and acylated sugars in aqueoussolutions is disclosed herein. Pyridoneimine as a new base is developed to mediate the deprotonation of readily available sugar hemiacetals and further reactions with alkylation and acylation agents.
Green glycosylation promoted by reusable biomass carbonaceous solid acid: an easy access to β-stereoselective terpene galactosides
作者:Bala Kishan Gorityala、Jimei Ma、Kalyan Kumar Pasunooti、Shuting Cai、Xue-Wei Liu
DOI:10.1039/c0gc00883d
日期:——
An efficient green protocol has been developed for the atom economic glycosylation of unprotected, unactivated glycosyl donors and glycosylation of glycosyl trichloroacetimidates with the aid of reusable eco-friendly biomass carbonaceous solid acid as catalyst.
Mimetics of ADP-Ribosylated Histidine through Copper(I)-Catalyzed Click Chemistry
作者:Hugo Minnee、Johannes G. M. Rack、Gijsbert A. van der Marel、Herman S. Overkleeft、Jeroen D. C. Codée、Ivan Ahel、Dmitri V. Filippov
DOI:10.1021/acs.orglett.2c01300
日期:2022.6.3
A convergent synthesis provided nearly perfect τ-ADP-ribosylated histidine isosteres (His*-τ-ADPr) via a copper(I)-catalyzed cycloaddition between an azido-ADP-ribosyl analogue and an oligopeptide carrying a propargyl glycine. Both α- and β-configured azido-ADP-ribosyl analogues have been synthesized. The former required participation of the C-2 ester functionality during glycosylation, while the latter