Process for the preparation of thienothiazine derivatives

摘要

Thienothiazine derivatives of the formula <IMAGE> in which A with the two carbon atoms forms the group <IMAGE> or <IMAGE>, in which the dashed line indicates the double bond present in the first case, R1 denotes lower alkyl and R2, R3 and R4 have the meaning given in Claim 1, have anti-inflammatory, analgesic and antirheumatic properties. They can be prepared by lower-alkylating appropriate compounds of the formula <IMAGE>