of β-galactosides of nucleosides and acyclic nucleoside analogues has been developed, using β-galactosidasefromEscherichiacoli as a catalyst and lactose as a sugar donor. The method is very rapid, feasible and last but not least inexpensive. Its applicability has been proven for a broad variety of possible substrates with respect to its scaling up for preparative use. Five new compounds from a series