Intramolecular Anionic Friedel-Crafts Equivalents. An Expeditious Synthesis of 4H-1,2-Benzothiazin-4-one 1,1-Dioxides from N-Arylsulfonylated Amino Acids - Bakker, Wouter I Iwema; Familoni, O B; Padfield, James; Snieckus, Victor (Synlett, 1997)