SEARCH Articles Figures Tables 2.1- Benzothiazine 2,2-dioxides synthesis 4/7-1,4-benzothiazin Benzothiazine Synthesis from Benzothiazines Synthesis of 1-2,1-benzothiazine 2,2-dioxide (sulfostyril) derivatives Synthesis of 3,4-dihydro-2,l-benzothiazine 2,2-dioxide derivatives Synthesis of enantiomerically pure 2,1-benzothiazines