Transformation of heterocyclic reversible monoamine oxidase-B inactivators into irreversible inactivators by N-methylation.

Basic Information

ID: ALA1126900

Journal: J Med Chem

Title: Transformation of heterocyclic reversible monoamine oxidase-B inactivators into irreversible inactivators by N-methylation.

Authors: Ding CZ, Silverman RB.

Abstract: 3-[4-[(3-Chlorophenyl)methoxy]phenyl]-5-[(methylamino)methyl]- 2-oxazolidinone (1) is a secondary amine known to be a potent time-dependent irreversible inactivator of monoamine oxidase B (MAO-B). The primary amine analogues of derivatives of 1, as well as of the corresponding dihydrofuranone and pyrrolidinone, had been shown to be time-dependent, but reversible, inhibitors of MAO-B. Here it is shown that the primary amine analogue of 1 is a time-dependent reversible inhibitor of MAO-B and that the secondary and tertiary amine analogues of the corresponding oxazolidinone, dihydrofuranone, and pyrrolidinone are time-dependent irreversible inhibitors of MAO-B. The reaction leading to the irreversible enzyme adduct formation with 1 can be reversed by increasing the temperature. These results are consistent with a stabilizing stereoelectronic effect on the enzyme adduct caused by N-methylation which hinders free rotation and prevents the sp3-orbital containing the nitrogen nonbonded electrons from being trans to the active site amino acid leaving group.

CiteXplore: 8246228

DOI: 10.1021/jm00075a015

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