摘要:
The synthesis of analogs of arthrobactin (5), a microbial iron chelator, and its imide 8 are described. The differentially protected citric acid residue 31 served as the key intermediate in making conjugates having a generalized structure 14 with two representative carbacephalosporin units, 15 and 16. Both conjugates, 49 and 51, showed antibiotic activity, while conjugate 51 obtained from beta-lactam 16 bearing a phenylglycyl side chain was shown to be more effective.