Synthesis of oxidized 1,2,3-thiadiazines by hydroperoxy-induced ring enlargement of 2-benzenesulfonylaminoisothiazolium salts
作者:Arne Kolberg、Joachim Sieler、Bärbel Schulze
DOI:10.1002/jhet.5570360441
日期:1999.7
Oxidation of 2-benzenesulfonylaminoisothiazolium salts 1, 2 and their imines 3, 4 with hydrogen peroxide gave 1,2,3-thiadiazine 1-oxides 5, 6, which were converted into the corresponding 1,2,3-thiadiazine 1,1-dioxides 7, 8 using m-chloroperoxybenzoic acid. Oxidation of 5, 6 with hydrogen peroxide furnished isothiazol-3(2H)-one 1,1-dioxides 9, 10 as ring contraction products.