A novel process for preparing 4-hydroxy-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxides is disclosed. The process involves the base catalyzed rearrangement of a saccharinacetamide of structure I to give II, ##STR1## wherein R.sup.1 is hydrogen or lower alkyl and R.sup.2 is lower alkyl, aryl or a heterocyclic ring selected from the group consisting of pyridyl, substituted-pyridyl, and thiazolyl. Compounds of the formula II have useful anti-inflammatory properties. In addition, they can be used as intermediate in the preparation of known anti-inflammatory agents.
本发明揭示了一种制备
4-羟基-2H-1,2-苯并
噻嗪-3-羧酰胺1,1-二氧化物的新工艺。该工艺涉及基催化重排结构式I的
糖精酰胺,以得到结构式II,其中R.sup.1为氢或低碳基,R.sup.2为低碳基、芳基或从
吡啶基、取代
吡啶基和
噻唑基所选的杂环。式II的化合物具有有用的抗炎性能,并且它们可以用作已知的抗炎药物的中间体。