title: Lipoxygenase inhibitors, Part 6. Synthesis of new tetrahydropyrazine and other heterocyclic compounds by reaction of hydrazonoyl chlorides.
abstract: Cyclization reactions of alpha-ketoarylhydrazonoyl chlorides with various dinucleophiles lead to new 1,4-benzothiazine, quinoxaline, tetrahydropyrazine, thiazole, and thiadiazoline derivatives of methyl butanoate or methyl 5-oxopentanoate. The inhibition of 5-lipoxygenase (LO) was determined by monitoring the leukotriene B4 (LTB4) formation of human polymorphonuclear leukocytes (PMNL). The IC50 values for the most active compounds with an arylhydrazone structure were found to lie between 0.7 and 7.5 microM.
authors.affiliation: Institute of Pharmaceutical Chemistry, Martin-Luther-University Halle-Wittenberg, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Frohberg
authors.forename: M
authors.initials: M
authors.lastname: Wiese
authors.forename: P
authors.initials: P
authors.lastname: Nuhn
mesh_terms: D006571:Heterocyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D007975:Leukotriene B4 / Q000096:biosynthesis; D016859:Lipoxygenase Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D015394:Molecular Structure; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism; D010879:Piperazines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D011719:Pyrazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D006571:Heterocyclic Compounds; D016859:Lipoxygenase Inhibitors; D010879:Piperazines; D011719:Pyrazines; D007975:Leukotriene B4