Some N-(arylsulfonyl)- C and N-(aroyl)-N-(arylmethyloxy)glycines D were synthesised and tested as aldose reductase inhibitors (ARIs). They are structurally related to the previously described ARIs of type A and B, from which they differ owing to the presence of a spacer, an OCH2 group, between the amino-acid nitrogen and the aromatic ring. The inhibitory activity was evaluated on the bovine lens aldose reductase enzyme. Compounds of types C and D show an inhibitory activity which, in the case of compounds D, is very similar to that reported for the parent compounds B. Kinetic studies carried out on the most active compound (8a), reveal that it produces an inhibition which, depending on its concentration, may be either uncompetitive or noncompetitive with respect to the substrate and the cofactor.
Synthesis and antimicrobial properties of cephalosporin derivatives substituted on the C(7) nitrogen with arylmethyloxyimino or arylmethyloxyamino alkanoyl groups
7-aminocephalosporanic acid (7-ACA) derivatives substituted on the C(7) nitrogen with 2-(arylmethyloxyimino)propionyl (3a-f), 2-(arylmethyloxyamino)propionyl (4a-d) and (arylmethyloxyamino)acetyl (2a-d) moieties were synthesized by reaction of the appropriate acylating agents with 7-ACA protected as a t-butyl ester, followed by removal of the t-butyl protecting group. The new compounds, tested in vitro for their antimicrobial