5-氨基-3,4-二甲基异唑 、 2-甲基-4-羟基-2H-噻吩并[2,3-e]-1,2-噻嗪-3-甲酸甲酯-1,1-二氧化物 反应 14.0h,
以there is obtained N-(3,4-dimethyl-5-isoxazolyl)-4-hydroxy-2-methyl-2H-thieno[2,3-e]-1,2-thiazine-3-carboxamide 1,1-dioxide of decomposition point 206°-208° C. (的产率得到4-hydroxy-2-methyl-1,1-dioxo-1,2-dihydro-1λ6-thieno[2,3-e][1,2]thiazine-3-carboxylic acid 3,4-dimethyl-isoxazol-5-ylamide
The present invention relates to compounds of the formula ##STR1## wherein A together with the two carbon atoms to which it is attached forms the group ##STR2## AND THE BROKEN LINE REPRESENTS THE DOUBLE BOND IN GROUP (A); R.sub.1 represents a lower alkyl group; R.sub.2 represents the residue of an aromatic heterocyclic ring containing from 1 to 4 hetero atoms, which may be substituted by one or two lower alkyl groups, or a phenyl group which may be substituted by halogen, hydroxy, lower alkyl, trifluoromethyl or lower alkoxy and R.sub.3 and R.sub.4 each represent a hydrogen atom or a lower alkyl group. Also provided are methods for their preparation. The thienothiazine derivatives provided by this invention have anti-flammatory, analgesic and antirheumatic activity.