申请人:Pfizer Inc.
公开号:US04100347A1
公开(公告)日:1978-07-11
Process for production of 3,4-dihydro-2-methyl-4-oxo-2H-1,2-benzothiazine-3-carboxylic acid-1,1-dioxide by hydrolysis, in the presence of hydroxide ions, of an alkyl or aralkyl ester thereof followed by precipitation of the acid at pH below 6.0 and its use as an intermediate for the production of N-(2-pyridyl)-3,4-dihydro-2-methyl-4-oxo-2H-1,2-benzothiazine-3-carboxamid e-1,1-dioxide and the analogous N-(2-thiazolyl)-compound, effective antiinflammatory agents.
通过在羟基离子存在下,对烷基或芳烷基酯进行水解,随后在pH低于6.0时沉淀出3,4-二氢-2-甲基-4-氧代-2H-1,2-苯并噻嗪-3-羧酸-1,1-二氧化物,并将其用作生产N-(2-吡啶基)-3,4-二氢-2-甲基-4-氧代-2H-1,2-苯并噻嗪-3-羧酰胺-1,1-二氧化物及其类似N-(2-噻唑基)化合物的有效抗炎剂的中间体的生产方法。