Relative structure-inhibition analyses of the N-benzoyl and N-(phenylsulfonyl) amino acid aldose reductase inhibitors
摘要:
A number of N-benzoyl amino acids were synthesized and tested to compare structure-inhibition relationships with the isosteric N-(phenylsulfonyl) amino acid (PS-amino acid) aldose reductase inhibitors. Inhibition analyses with these series reveals that their kinetic mechanisms of inhibition are similar, but that significant differences in structure-inhibition relationships exist. For example, while the PS-alanines and PS-2-phenylglycines produce enantioselective inhibition (S > R), no consistent pattern of enantioselectivity is observed with the isosteric N-benzoylalanines and 2-phenylglycines. Also, N-methyl and N-phenyl substitution in the PS-amino acid series does not substantially alter inhibitory activity, while similar substitutions in the N-benzoyl series (particularly N-phenyl) results in a significant increase in inhibitory activity. Proton NMR analysis of the N-benzoylsarcosines reveals that these compounds exist as a mixture of rotamers in solutions including the enzyme assay buffer and that the preferred conformer is one in which the carboxymethyl moiety is trans to the aromatic ring. Similar analyses with the N-benzoyl-N-phenylglycines demonstrate that these derivatives exist exclusively in the trans rotameric conformation in solution. No such N-substituent effects on conformation were observed in the PS-amino acid series. These results suggest that the differences in structure-inhibition trends between these structurally related series may result from the effect of substituents on preferred conformation.
Composition containing a penem or carbapenem antibiotic
申请人:SANKYO COMPANY LIMITED
公开号:EP0178911A2
公开(公告)日:1986-04-23
57 Administration of an N-acylated amino acid (ornithine, lysine, phenylglycine or phenylalanine) in association with a penem or carbapenem antibiotic relieves or eliminates the renal problems associated with administration of the antibiotic alone. The amino acid and antibiotic may be formulated together as a composition or administered separately, either simultaneously or sequentially. A pharmaceutical composition may be prepared simply by mixing the two components.
Process for the separation of a mixture of enantiomers
申请人:DSM N.V.
公开号:EP0838448A1
公开(公告)日:1998-04-29
The invention relates to a process for the preparation of a diastereomer complex and the preparation of enantiomers in optically enriched form in which one or more mixtures of enantiomers in a solvent are contacted with one or more resolving agents, yielding the diastereomer complex, and in which optionally (a mixture of) the enantiomer(s) present in the diastereomer are subsequently isolated in optically active form from the diastereomer complex.
The invention further relates to a diastereomer complex comprising at least three compounds of which at least one compound is a resolving agent in optically active form and at least one compound is an enantiomer in optically active form.