δ-(L-α-Aminoadipoly)-L-cysteinyl-N-hydroxy-D-valine (3a) has been prepared from the appropriately protected amino acids; (3a) was not converted into isopenicillin N (2) using a cell-free from Cephalosporium acremonium but inhibited the formation of (2) from δ-(L-α-aminoadipoyl)-L-cysteinyl-D-valine (1) by this system.
δ-(L-δ-
氨基己二酰)-L-半胱
氨酰-N-羟基-
D-缬氨酸(3a)是由适当保护的
氨基酸制备的;使用无细胞
头孢菌素(Cephalosporium acremonium)不能将(3a)转化为异
青霉素 N(2),但该系统能抑制δ-(L-δ-
氨基己二酰)-L-半胱
氨酰-
D-缬氨酸(1)生成(2)。