1,2,4-Benzothiadiazine 1,1-Dioxides, Part 4: Mitsunobu Reactions of 3-Hydroxyalkylamino- and 3-Mercaptoalkylamino-4H1, 2,4-benzothiadiazine 1,1-Dioxides. A Convenient Synthesis of Built-in Guanidine Tricycles and Disulfides - Chern, Ji-Wang; Shiau, Chia-Yang; Wu, Ying-Hwa (Synthesis, 1991)