title: Aromatic hydroxylation of beta-adrenergic antagonists. Formation of 4'- and 5'-hydroxy-1-(isopropylamino)-3-[2'-allyloxy)phenoxy]-2-propanol from oxprenolol.
abstract: The metabolic aromatic hydroxylation of oxprenolol [1-(isopropylamino)-3-[2'-(allyloxy)phenoxy]-2-propanol] in rats was examined. Synthesis of the isomeric ring methoxyoxprenolols (3b-6b) was accomplished from the isomeric methoxysalicylaldehydes by O-allylation, followed by Baeyer-Villiger oxidation. The propanolamine side chain was elaborated by O-alkylation of the Bayer-Villiger product with epichlorohydrin and subsequent oxirane opening with isopropylamine. Gas chromatography-mass spectra of the trifluoroacetyl derivatives of these standards was compared with urinary metabolites obtained from the rat, after methylation with diazomethane and derivatization with trifluoroacetic anhydride. Both 4'- and 5'-hydroxyoxprenolol (4a and 5a) were present in an approximate 4:1 ratio. No 3'- or 6'-hydroxyoxprenolol (3a and 6a) was detected. The metabolites obtained from a human urine treated in the same manner gave similar results with both 4a and 5a present.
mesh_terms: D000818:Animals; D001711:Biotransformation; D002849:Chromatography, Gas; D006801:Humans; D006900:Hydroxylation; D008297:Male; D013058:Mass Spectrometry; D008745:Methylation; D010096:Oxprenolol / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000378:metabolism*; D051381:Rats
chemical_list: D010096:Oxprenolol