3-oxo-1,4-benzothiazine derivatives

Details 3-oxo-1,4-benzothiazine derivatives 3-oxo-1,4-benzothiazine derivatives

C - Chemistry, Metallurgy

07

D

C07D 279/16 (2006.01) A61K 31/54 (2006.01) A61K 31/695 (2006.01) C07D 417/12 (2006.01) C07F 7/10 (2006.01)

Patent

CA 2122370

- 42 - ABSTRACT This invention offers the compounds of the formula [I] which are useful for treatment of cataract. Image [ I ] wherein R1 is hydroxy which can be protected by a protective group; R2 is lower alkyl; R3 is hydrogen, lower alkyl, hydroxy, which can be protected by a protective group, or lower alkoxy, and the said lower alkyl can be substituted by hydroxy, which can be protected by a protective group, amino or lower alkylamino; R4 is carboxy which can be converted to ester or amide, and A is alkylene.

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