A combined chemical and enzymatic strategy for the construction of carbohydrate-containing antigen core units
作者:Gary C. Look、Yoshitaka Ichikawa、Gwo Jenn Shen、Pi Wan Cheng、Chi Huey Wong
DOI:10.1021/jo00068a030
日期:1993.7
Glycosidase-mediated coupling of glycal acceptors with galactose donors affords beta1,3-linked disaccharides that are versatile intermediates for further chemical and enzymatic manipulation. The utility of these disaccharides is demonstrated by the elaboration of these compounds into the type I and type IV core disaccharides of carbohydrate-containing antigens. Further conversion of the type IV disaccharide to a mucin-type trisaccharide (Galbeta1,3(GlcNAcbeta1,6)GalNAc) was accomplished with the use of a beta1,6-N-acetylglucosaminyltransferase. This combined use of enzymatic and chemical methodologies allows for the rapid assembly, with high regio- and stereoselectivity, of core oligosaccharides of biologically important glycoconjugates.