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.
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