Lipoxygenase Inhibitors, Part 6[1]. Synthesis of New Tetrahydropyrazine and Other Heterocyclic Compounds by Reaction of Hydrazonoyl Chlorides
作者:Petra Frohberg、Michael Wiese、Peter Nuhn
DOI:10.1002/ardp.19973300302
日期:——
Cyclization reactions of α‐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
Cyclization reactions of alpha-ketohydrazonyl chlorides such as methyl 6-arylhydrazono-6-chloro-5-oxohexanoates (2) and the 6-arylhydrazono-6-chloro-5-oxohexanoic acids (3) with o-aminothiophenol lead to 1,4-benzothiazine derivatives. The tautomeric and isomeric equilibria are discussed using H-1 and N-15 NMR as well as X-Ray diffraction analysis.