The synthesis and reactions of a monocyclic β-lactam tripeptide, 1-[(1R)-carboxy-2-methylpropyl]- (3R -[(5S-5-amino- 5-carboxypentanamido]-(4R)-mercaptoazetidin-2-one, a putative intermediate in penicillin biosynthesis
γ-Lactam formation from tripeptides with isopenicillin N synthase
作者:Jack E. Baldwin、William J. Norris、Richard T. Freeman、Mark Bradley、Robert M. Adlington、Sadie Long-Fox、Christopher J. Schofield
DOI:10.1039/c39880001128
日期:——
Incubation of isopenicillinNsynthase (IPNS) with analogues of the natural substrate [(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine (2) in which the cysteinyl residue was replaced by homocysteine gave epimeric 5-hydroxy γ-lactams (10), with no evidence for the formation of bicyclic products.