296773-65-4Relevant academic research and scientific papers
Synthetic utilization of polynitroaromatic compounds. 2. Synthesis of 4,6-dinitro-1,2-benzisothiazol-3-ones and 4,6-dinitro-1,2-benzisothiazoles from 2-benzylthio-4,6-dinitrobenzamides
Zlotin,Kislitsin,Podgursky,Samet,Semenov,Buchanan III,Gakh
, p. 8439 - 8443 (2000)
Cyclization of 2-benzylthio-4,6-dinitrobenzamides to 4,6-dinitro-1,2-benzisothiazol-3-ones was achieved using SO2Cl2 in CH2Cl2 at room temperature. Alkylation of these heterocycles proceeded in a nonregioselective manner to yield a mixture of corresponding O- and N-alkylated products. Oxidation of 4,6-dinitro-1,2-benzisothiazoles (50% H2O2 in AcOH) afforded the corresponding S-oxides and S,S-dioxides, depending on oxidation conditions. Unexpectedly, oxidation of a 3-methoxy derivative resulted in ring opening with the formation of the corresponding sulfamide. Chlorination of these 4,6-dinitro-1,2-benzisothiazol-3-ones (PCl5-POCl3) gave the expected 3-chloroisothiazoles.
