Kyorin Pharmaceutical Co., Ltd.

Masaya Takei

Yoshikazu Asahina

Yasumichi Fukuda

Masanori Takadoi

Hideyuki Fukuda

Taro Sato

Hiroyuki Ebisu

Haruaki Kurasaki

To provide a novel mutilin derivative having a substitution at the 14-position, which is a novel mutilin analogue exhibiting a potent and broad antimicrobial action against Gram-positive bacteria and Gram-negative bacteria including various drug-resistant bacteria, and which is expected to be useful as an agent for treating infectious diseases. A mutilin derivative represented by the following general formula (1): or a pharmaceutically acceptable addition salt thereof.

Mutilin derivative having heterocyclic aromatic ring carboxylic acid structure in substituent at 14-position

Object To provide novel quinolinecarboxylic acid compounds serving as safe, strong antibacterial agents that are effective against drug-resistant bacteria that are less susceptible to conventional antibacterial agents. Solving Means There are provided 7-(4-substituted-3-cyclopropylaminomethylpyrrolidinyl)quinolonecarboxylic acid derivatives (such as 1-cyclopropyl-7-[(3S,4S)-3-cyclopropylaminomethyl-4-fluoro-1-pyrrolidinyl]-6-fluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid) that exhibit strong antibacterial activity against gram-positive bacteria, such as MRSA, PRSP and VRE, while being safe. The compounds are shown by the following general formula (I): 

7- (4-substituted-3-cyclopropylaminomethyl-1-pyrrolidinyl) quinolonecarboxylic acid derivative

To provide novel quinolonecarboxylic acid compounds serving as safe, strong antibacterial agents that are effective against drug-resistant bacteria that are less susceptible to conventional antibacterial agents. There are provided 7-(4-substituted-3-cyclopropylaminomethylpyrrolidinyl)quinolonecarboxylic acid derivatives (such as 1-cyclopropyl-7-[(3S,4S)-3-cyclopropylaminomethyl-4-fluoro-1-pyrrolidinyl]-6-fluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid) that exhibit strong antibacterial activity against gram-positive bacteria, such as MRSA, PRSP and VRE, while being safe. The compounds are shown by the following general formula (I): 

7-(4-Substituted-3-cyclopropylaminomethyl-1 pyrrolidinyl) quinolonecarboxylic acid derivative

A compound as represented by the general formula (I) shown below exhibits high antibacterial activity against gram-positive bacteria, in particular, such drug-resistant bacteria as mRNA, PRSP and VRE: wherein R1 is a methyl group, a fluoromethyl group, a methoxymethyl group, an acetoxymethyl group, a hydroxymethyl group or a methylene; R2 is a hydrogen atom, a lower alkyl group having 1 to 3 carbon atoms, or a pharmaceutically acceptable cation and an ester of a prodrug; R3 is a hydrogen atom or a halogen atom; R4 is a hydrogen atom, a lower alkyl group having 1 to 3 carbon atoms, a fluoromethyl group, a trifluoromethyl group or a fluorine atom; and R5 is a hydrogen atom or a fluorine atom, with exceptions where R1 is a methyl group, R4 and R5 are at the same time a hydrogen atom, and R3 is a fluorine atom.

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Tochigi, Japan

Masaya Takei