title: Regioselective cleavage reaction of the aromatic methylenedioxy ring. VI. Synthesis of phenothiazine analogues by using the cleavage reaction with sodium methoxide-thiols in dimethyl sulfoxide and evaluation of their biological activities.
abstract: The reactions of aromatic methylenedioxy compounds containing electron-withdrawing groups with sodium methoxide-thiols in dimethyl sulfoxide gave 3- and 4-hydroxybenzene derivatives in good yield by regioselective attack of the thiolate ions on the methylenedioxy ring. The formation mechanism and the reactivity of thiolate ions in the cleavage reaction of the methylenedioxy ring are discussed. Various biologically active compounds, 32a, 32d, 36b, 38b, 41b and 44-47, were prepared from the 4-hydroxybenzene derivatives and their Ca2+ antagonistic activities were evaluated. Among these compounds, 2-(2-bromophenylthiomethoxy)-10-(2-diethylaminoacetyl)-3- methoxyphenothiazine (46) showed the most potent Ca2+ antagonistic activity. Biological activity could be conveniently evaluated by measurement of the peak height of the vanadyl ion (+4 oxidation ion) signal produced by redox reaction between the phenothiazine derivatives and vanadate ion +5 oxidation ion) with ESR spectroscopy.
authors.affiliation: Faculty of Sciences, Naruto University of Education, Tokushima, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Imakura
authors.forename: T
authors.initials: T
authors.lastname: Konishi
authors.forename: K
authors.initials: K
authors.lastname: Uchida
authors.forename: H
authors.initials: H
authors.lastname: Sakurai
authors.forename: S
authors.initials: S
authors.lastname: Kobayashi
authors.forename: A
authors.initials: A
authors.lastname: Haruno
authors.forename: K
authors.initials: K
authors.lastname: Tajima
authors.forename: S
authors.initials: S
authors.lastname: Yamashita
mesh_terms: D000818:Animals; D002121:Calcium Channel Blockers / Q000138:chemical synthesis* / Q000494:pharmacology; D004121:Dimethyl Sulfoxide; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D000432:Methanol / Q000737:chemistry; D009131:Muscle, Smooth, Vascular / Q000187:drug effects; D010640:Phenothiazines / Q000138:chemical synthesis* / Q000494:pharmacology; D011817:Rabbits; D051381:Rats; D017208:Rats, Wistar; D013438:Sulfhydryl Compounds / Q000737:chemistry
chemical_list: D002121:Calcium Channel Blockers; D010640:Phenothiazines; D013438:Sulfhydryl Compounds; D000432:Methanol; D004121:Dimethyl Sulfoxide