title: Synthesis of 3-substituted 2-oxo-1,4-thiazines and evaluation of their protective effect against endotoxin shock in mouse.
abstract: 5-Methyl-2,3-dioxo-2H,4H-1,4-thiazine (7) was obtained by the oxidation of 5-methyl-2H-1,4-thiazin-3(4H)-one (5) with m-chloroperbenzoic acid in MeOH, followed by acid hydrolysis of the resulting 2,2-dimethoxy-1,4-thiazine (6). 3-Chloro-2-oxo-1,4-thiazine (10), which was obtained from 7 by heating with phosphorous oxychloride, reacted with various nucleophiles to give 3-substituted 2-oxo-1,4-thiazines (11a--y). Some of these 2-oxo-1,4-thiazines, 11a--b, e, o and r--s, showed a protective effect against endotoxin shock in D-galactosamine-sensitized mice.
authors.affiliation: Research Laboratory, Zenyaku Kogyo Co., Ltd., Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamazaki
authors.forename: H
authors.initials: H
authors.lastname: Harada
authors.forename: K
authors.initials: K
authors.lastname: Matsuzaki
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: H
authors.initials: H
authors.lastname: Saito
mesh_terms: D000818:Animals; D004353:Drug Evaluation, Preclinical; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D012772:Shock, Septic / Q000517:prevention & control*; D013843:Thiazines / Q000138:chemical synthesis* / Q000627:therapeutic use
chemical_list: D013843:Thiazines