Facile Syntheses of 2H-1,2,4-Benzothiadiazine 1,1-Dioxides and 4-Oxo-3,4-dihydroquinazolines from 2-Aminobenzenesulfonamide or 2-Aminobenzamide and Aldehydes in the Presence of Sodium Hydrogen Sulfite - Imai, Yoshio; Sato, Sadayuki; Takasawa, Ryuichi; Ueda, Mitsuru (Synthesis, 1981)