title: Thiomethylation and thiohydroxylation--a new pathway of metabolism of heterocyclic compounds.
abstract: 1. G.l.c.--mass spectral analysis of t.l.c. fractions of urine samples of patients treated with 5-(2-chloroethyl)-4-methylthiazole (clomethiazole), has revealed two minor metabolites, each with two sulphur atoms. 2. Their structures were found to be 2-methylthio-clomethiazole and 5-acetyl-4-methyl-2-mercapto-thiazole, formed by thiomethylation and thiohydroxylation, respectively, of the original compound. 3. The structures of six other minor metabolites resulting from side-chain degradation have been elucidated. 4. The occurrence of metabolites with substituents at position 2 of the heterocyclic nucleus is assumed to be initiated by oxidative attack at the nitrogen, followed by nucleophilic substitution in position 2.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002719:Chlormethiazole / Q000378:metabolism*; D006571:Heterocyclic Compounds / Q000378:metabolism*; D006801:Humans; D006900:Hydroxylation; D008745:Methylation; D010084:Oxidation-Reduction; D013438:Sulfhydryl Compounds / Q000378:metabolism
chemical_list: D006571:Heterocyclic Compounds; D013438:Sulfhydryl Compounds; D002719:Chlormethiazole