Synthesis of 4H-1,4-Benzothiazine-1,1-dioxides (Sulfones) and Phenothiazine-5,5-dioxides (Sulfones)
摘要:
The study of the oxidation behavior of 4H-1,4-benzothiazines and phenothiazines by 30% hydrogen peroxide in acetic acid results in the formation of 4H-1,4-benzothiazine-1,1-dioxides (sulfones) and 10H-phenothiazine-5,5-dioxides (sulfones) respectively. The purity of all the synthesized compounds has been checked by thin layer chromatography using silica "G" as an adsorbent in various nonaqueous solvent systems. Infra-red and proton-magnetic resonance spectral studies are also included.
Synthesis of 7-ethoxy- and 7-fluoro-phenothiazines
摘要:
Synthesis of 7-ethoxy- and 7-fluoro-phenothiazines is reported by Smiles rearrangement of 5-ethoxy- and 5-fluoro-2-formamido-2'nitrodiphenylsulfides. The later were obtained by the formylation of 2-amino-5-ethoxy/5-fluoro-2'-nitrodiphenylsulfides which were prepared by the condensation of 2-amino-5-ethoxyl-5-fluoro-benzenethiols with o-halonitrobenzenes.