Sulfonic Acid Functionalized Nano-γ-Al₂O₃: A New, Efficient, and Reusable Catalyst for Synthesis of 3-Substituted-2H-1,4-Benzothiazines

Scheme 2

Synthesis of 3-substituted-2H-1,4-benzothiazines using sulfonic acid functionalized nano-γ-Al₂O₃.