Reactions of <b><i>o</i></b>-Aminothiophenol and <b><i>o</i></b><b>-</b>Aminophenyl Disulfide with Itaconic Anhydride and (-)-Dimenthyl Itaconate: Access to Enantiomerically Pure 1,5-Benzothiazepines and Benzothiazolyl-2-methylacrylic Acid
A facile chemo- and regioselective reactions of o-aminothiophenol (o-ATP) with itaconicanhydride is described. 1,5-Benzothiazepinyl-3-acetic acid is obtained in 81% yield via the exclusive Michael type addition of the thiol unit from o-ATP to the carbon-carbon double bond in itaconicanhydride followed by an intramolecular anhydride ring opening with an amine unit. The moderately stereoselective Michael