Collect. Czech. Chem. Commun. 1992, 57, 656-659

Preparation of Some Pyrazole Derivatives by Extrusion of Elemental Sulfur from 1,3,4-Thiadiazines

Stanislav Rádl

Research Institute for Pharmacy and Biochemistry, 130 60 Prague 3


In connection with our research of pyrazolo[3,4-b]quinolines we were also interested in the preparation of various pyrazole intermediates. In some cases we found a method useful based on extrusion of elemental sulfur from intermediate 1,3,4-thiadiazines. This short contribution describes the preparation of some new 3-anilino-4-pyrazolecarboxylic acid derivatives using this method.