Patent ID: 8507481

Claim:
Benzoxazine oxazolidinone compounds represented by the formula (I), optical isomers or pharmaceutically acceptable salts thereof, Wherein: U is H or F; R 1 is R 2 is a phenyl group, or a five membered or six membered aromatic or non-aromatic heterocyclic group; said phenyl group is optionally substituted by F, —CN, —NH 2 , or C 1 -C 3 alkylcarbonyl group; said five membered or six membered aromatic or non-aromatic heterocyclic group comprises at least one heteroatom selected from N, O or S; Said five membered or six membered aromatic or non-aromatic heterocyclic group may optionally be substituted by the following functional groups: F, Cl, Br, —OH, —NO 2 , —CHO, —CN, —NH 2 , —CF 3 , —C≡CH, —C≡CCH 2 OH, —COOH, —OR 3 , —NHCOR 3 , —COR 3 ; —CONR 3 R 4 , and —COOR 3 , wherein each of R 3 and R 4 can independently be a C 1 -C 3 alkyl; or said five membered or six membered aromatic or non-aromatic heterocyclic group may optionally be substituted by C 1 -C 6 straight chain or branched chain alkyl group, or C 3 -C 6 cycloalkyl group, and said C 1 -C 6 straight chain or branched chain alkyl group or C 3 -C 6 cycloalkyl group may optionally be substituted by —OH, —CN, or —NH 2 ; or said five membered or six membered aromatic or non-aromatic heterocyclic group may optionally be substituted by five membered or six membered aromatic or non-aromatic heterocyclic group, which comprises at least one heteroatom selected from N and O and is either unsubstituted or substituted by C 1 -C 3 alkyl or oxygen.