Reactions of o-Aminothiophenol and o-Aminophenyl Disulfide with Itaconic Anhydride and (-)-Dimenthyl Itaconate: Access to Enantiomerically Pure 1,5-Benzothiazepines and Benzothiazolyl-2-methylacrylic Acid - Baag, Md Merajuddin; Sahoo, Manoj Kumar; Puranik, Vedavati G; Argade, Narshinha P (Synthesis, 2007)