1,3-Benzothiazinone derivatives, process for producing the same and use thereof

A compound represented by formula:

• [wherein, R1 represents (1) a halogen atom, (2) hydroxy (3) nitro, (4) an optionally halogenated alkyl, (5) an acyl or (6) an optionally substituted amino;
• R2 represents (1) an optionally substituted branched alkyl, (2) an optionally substituted cycloalkyl, (3) an optionally substituted fused homocyclic group, or (4) a group represented by formula:
• (wherein, R3 and R7 each independently represents (i) hydrogen atom, (ii) fluorine atom, (iii) bromine atom, (iv) nitro, (v) cyano, (vi) an optionally substituted alkyl, (vii) an optionally substituted alkoxy (viii) an optionally substituted aryl, (ix) an acyl, (x) an optionally substituted alkylsulfonyl (xi) an optionally substituted carbamoyl or (xii) an optionally substituted amino;
• R4 and R6 each independently represents (i) hydrogen atom, (ii) fluorine atom, (iii) bromine atom, (iv) hydroxy (v) cyano, (vi) an alkyl having a substituent selected from carboxy, a halogen atom, an alkoxycarbonyl and an arylcarbonylamino (vii) an optionally substituted alkoxy (viii) an optionally substituted aryl, (ix) an acyl, (x) an optionally substituted alkylsulfonyl (xi) an optionally substituted carbamoyl (xii) an optionally substituted amino or (xiii) an optionally substituted alkoxycarbonyl;
• and R5 represents (i) hydrogen atom, (ii) fluorine atom, (iii) hydroxy (iv) cyano, (v) an alkyl substituted with a halogen atom, (vi) an optionally substituted aryl, (vii) an acyl, (viii) an optionally substituted carbamoyl or (ix) an optionally substituted amino (provided that the compounds wherein all of R3 to R7 represent hydrogen atoms are excluded));
• and n represents an integer of 0 to 4], or a salt thereof.