A New Synthesis of 4H-1,4-Benzothiazine Derivatives Based on Ring Closure of EWG-Stabilized (2-Isocyanophenylthio)methyl Anions - Kobayashi, Kazuhiro; Hayashi, Kazutaka; Iitsuka, Daisuke; Morikawa, Osamu; Konishi, Hisatoshi (Synthesis, 2006)