abstract |
The present invention relates to pyrrolidin-2-one according to formula (I) or a salt thereof, wherein R 1 is hydrogen or a nitrogen protecting group, a process for their preparation and the preparation of NEP-inhibitors, in particular N- (3-carboxyl- (2R) -methylbutanoic acid ethyl ester or a salt thereof in the manufacture of a medicament for use in the preparation of a medicament. ≪ Formula 1 > |