process for the production of 4 - hydroxy - 2 - methyl - 2h - 1.2 - benzothiazin - 3 - n - (2 - pyridyl) carboxamid - 1.1 - dioxide

摘要

The present invention refers to a new process for preparing 4- hydroxy- 2-methyl-2H-1,2-benzothiazine-3- N-(2-pyridinyl)carboxamide!-1,1- dioxide, its phosphoric ester and the obtained phosphoric ester.