Complete synthesis of 3′‐sialyl‐N‐acetyllactosamine by regioselective transglycosylation

Abstract
Transglycolytic synthesis of 3′‐sialyl‐N‐acetyllactosamine by sequential use of β‐galactosidase from Bacillus circulans and trans‐sialidase from Trypanosoma cruzi was described. These reactions depicted the first complete synthesis of a biologically important oligosaccharide with high regioselectivity avoiding use of glycosyltransferases and NDP sugars.