Chemoenzymatic Synthesis of Uridine 5′-Diphospho-2-acetonyl-2-deoxy-α-<scp>d</scp>-glucose as C<sub>2</sub>-Carbon Isostere of UDP-GlcNAc
作者:Li Cai、Wanyi Guan、Wenlan Chen、Peng George Wang
DOI:10.1021/jo100385p
日期:2010.5.21
2-ketoGlc, which is the C2-carbon isostere of GlcNAc, is a novel GlcNAc analogue with a ketone group. The corresponding glycosyltransferase donor substrate, UDP-2-ketoGlc, is necessary for synthesizing 2-ketoGlc-containing molecules and is thus highly important for metabolic polysaccharide remodeling and engineering. We report here the first chemoenzymatic synthesis of UDP-2-ketoGlc using our two-enzyme
Improved synthesis of UDP-2-(2-ketopropyl)galactose and a first synthesis of UDP-2-(2-ketopropyl)glucose for the site-specific linking of biomolecules via modified glycan residues using glycosyltransferases
作者:Andrés E. Dulcey、Pradman K. Qasba、Jeffrey Lamb、Gary L. Griffiths
DOI:10.1016/j.tet.2011.01.081
日期:2011.3
The potential of wild-type and mutant glycosyltransferases to produce glycoconjugates carrying sugar moieties with chemical handles has made it possible to conjugate biomelecules with orthogonal reacting groups at specific sites. The synthesis of UDP-2-(2-ketopropyl)galactose has been previously carried out, albeit with difficulty and low efficiency. A modified approach has been developed for the synthesis of UDP-2-(2-ketopropyl)glucose and UDP-2-(2-ketopropyl)galactose, allowing better access to the desired test compounds, the UDP-2-(2-ketopropyl)glucose and UDP-2-(2-ketopropyl)galactose analogs were synthesized in eight steps and 4.8% and 5.3% overall yield, respectively, an improvement over the first generation synthesis involving eight steps and an overall yield of 0.7%. Published by Elsevier Ltd.