Formation of a novel N–N bond through SO extrusion. Regioselective synthesis of 1,2,6-thiadiazine S-oxides and pyrazoles
Abstract
The preparation of the 1,2,6-thiadiazine S-oxides (3) and their conversion into the pyrazoles (4) is described; the formation of (4) results from N–N bond formation following the extrusion of SO.