ANTI-DRUG RESISTANT STRAIN AGENTS AND ANTICHLAMYDIA AGENTS

Abstract: In order to provide antibacterial agents for drug-resistant bacteria and anti-Chlamydia agents, the furanonaphthoquinone derivative represented by the following formula (1): wherein each R may be the same or different, representing any one of the following (a) to (e) : - R' -OR' - SR' (wherein R' is a hydrogen atom, alkyl group, hydroxyalkyl group, or alkoxyalkyl group), or two mutually adjacent Rs may be bonded via an oxygen atom to form a heterocyclic ring is used as the effective component.

Description: The invention of the present application relates to anti-Chlamydia agents. More particularly, the present invention relates to novel anti-Chlamydia agents, which comprise highly active furanonaphthoquinone derivatives as effective components. Chlamydia is a spherical bacterium of 0.2 µm in diameter, which is known to be the causal bacterium of parrot fever infected from pet birds (accompanied with fever, headache, and pneumonia), infections caused by sexual intercourse, urethritis, cervicitis, lymphogranuloma venereum, conjunctivitis, pneumonia, etc. In Asia and Africa, trachoma accompanying blindness is raging. In addition, recent studies have found Chlamydia infections, which cause infertility in women and arteriosclerosis. Although antibiotics such as macrolide derivatives and tetracycline derivatives have been used as therapeutic agents, in practice, the incidence rate is reported to be higher than that of gonorrhea. Moreover, since recent new drugs have broad spectra, the acquisition of resistance of other bacteria against drugs has become a problem. Therefore, the development of novel highly specific anti-Chlamydia agents of which the action mechanism is different from that of the drugs known so far, is anticipated. In this situation, as a means to solve the above-mentioned problem, the invention of the present application provides the use of a furanonaphthoquinone derivative represented by the following formula (1): wherein each R may be the same or different representing any one of the following (a) to (e) : -R' -OR' - SR' (wherein R' is a hydrogen atom, alkyl group, hydroxyalkyl group, or alkoxyalkyl group), or two mutually adjacent Rs may be bonded via an oxygen atom to form a heterocyclic ring in the manufacture of a medicament for the prophylaxis or treatment of Chlamydia. In the agents of the present invention described above, wherein furanonaphthoquinone derivatives are used as the effective component, a wide variety of furanonaphthoquinone derivatives may be used. These are exemplified by, for example, 2-methylnaphtho[2,3-b]furan-4,9-dione, 2-acetylnaphtho [2,3-b]furan-4,9-dione, 2-(1-hydroxyethyl)naphtho[2,3-b] furan-4,9-dione, naphtho[2,3-b]furan-4,9-dione, 5(or 8)- hydroxy-2-(1-hydroxyethyl)naphtho[2,3-b]furan-4,9-dione, 5(or 8)-hydroxynaphtho[2,3-b]furan-4,9-dione, 2-methyl-5(or 8)-hydroxy-2-methylnaphtho[2,3-b]furan-4,9-dione, 1,3-dimethylisofuranonaphthoquinone, 2-(acetylethylenacetal) naphtho[2,3-b]furan-4,9-dione, 8-hydroxy-7-methoxynaphtho- [2,3-b]furan-4,9-dione, 3-acetyl-5,8-dimethoxy-2- methylnaphtho[2,3-b]furan-4,9-dione, etc. The furanonaphthoquinone derivatives used in this invention are not limited to these examples, and a variety of embodiments represented by the above formula may be included. In addition, to the alkyl group, hydroxyalkyl group, and alkoxyalkyl group of the above formula, other substituents such as alkenyl group, cycloalkyl group, cycloalkenyl group, aryl group, halogen atom, amino group, nitro group, cyano group, thiol group, thioether group, carboxyl group, ester group, amide group, sulfonyl group, haloformyl group, heterocyclic group, etc., may optionally be attached, as long as they do not interfere with the activity. These various compounds may be produced by a variety of known methods of chemical synthesis or by methods such as the extraction of naphthoquinone as natural product from bark, etc. The mode for carrying out the invention is explained in more detail by the following examples. Examples Reference Example 1 : Production of 2-methylnaphtho[2,3-b] furan-4,9-dione (Compound A) 2-Hydroxy-3-(2-propenyl)-1,4-naphthoquinone (150 mg) synthesized from 2-hydroxy-1,4-naphthoquinone and propionaldehyde was refluxed together with DDQ (200 mg) in benzene (20 ml) under stirring. After 2 to 3 hours, the reaction mixture was cooled and filtered, and the filtrate was distilled. The residue was subjected to column chromatography (30 g of silica gel, benzene), and the first yellow fraction obtained gave the desired Compound A (FNQ3) as yellow crystals (35%). Example 1 Although diseases possibly caused by chronic infections with Chlamydia, such as the involvement of C. pneumoniae in arteriosclerosis, and infertility caused by C. trachomatis, etc., are regarded as important, it is considered highly possible that the long-term administration of conventional anti-Chlamydia agents, for the prevention and/or treatment of such diseases, may cause additional problems such as the emergence of resistant strains, and side effects. Therefore, the screening of new substances, which may be useful as prophylactics or therapeutic agents for chronic diseases caused by Chlamydia, is considered to be meaningful. <A> Materials for Test Hence, the furanonaphthoquinone (FNQ) derivative having selective anti-tumor effect and various antibacterial effects, derived from the South American plant, Tecoma ipe Mart, drew the inventor's attention, and its anti-Chlamydia effect was examined, in vitro. <B> Test Method As culture cells, HeLa229, McCoy and WI38 were used. As Chlamydia, TW-183 strain and KKpn-1 strain of C. pneumoniae, L 2 strain, D strain and F strain of C. trachomatis, and Cal10 strain of C. psittaci were used. As for FNQ3 and the Compound derived from FNQ3 by replacing the methyl group with -CH 2 OH (FNQ19), the MIC (minimum inhibitory concentration), which inhibited growth by 100%, was determined according to the standard method of the Japanese Society of Chemotherapy. Additionally, morphometrical observations were performed using an electron microscope. The results are shown in Table 1 and Table 2. <C> Test Result Table 1 and Table 2 show that both FNQ3 and FNQ19 completely inhibit the growth of all tested strains of Chlamydia at a low concentration of 0.25 to 1.0 µg/ml. It was recognized that the MIC value showed a tendency to decrease to approximately 1/2, when McCoy and WI38 cells were used, as compared to when HeLa229 cells were used. Further, through the observations by electron microscope, it was also confirmed that the growth was suspended after 18 hours of drug addition, and remained completely inhibited even after 72 hours. Although a detailed mechanism of anti-Chlamydia effect has not been clarified at present, it was confirmed that the FNQ derivatives could be useful as prophylactics or therapeutic agents for diseases caused by chronic infections with Chlamydia. Anti-chlamydial activity of FNQ3 (MIC µg/ml) HeLa229 McCoy WI 38 C. pneumoniae TW-183 0.6 N.D. KKpn-1 0.25 0.25 C. trachomatis L 2 1.0 0.6 0.5 D 1.0 F 1.0 C. psittaci Cal 10 1.0 0.5 0.25 Anti-chlamydial activity of FNQ19 (MIC µg/ml) HeLa229 WI 38 C. pneumoniae KKpn-1 0.5 N.D. C. trachomatis L 2 0.25 0.25 C. psittaci Cal 10 0.25 0.25 As described in detail above, the invention of the present application provides highly active anti-Chlamydia agents.

Claims: Use of a furanonaphthoquinone derivative represented by the following formula (1): wherein each R may be the same or different representing any one of the following (a) to (e) : - R' - OR' - SR' (wherein R' is a hydrogen atom, an alkyl group, a hydroxyalkyl group, or an alkoxyalkyl group), or two mutually adjacent Rs may be bonded via an oxygen atom to form a heterocyclic ring in the manufacture of a medicament for the prophylaxis or treatment of Chlamydia. Use as claimed in claim 1 wherein said furanonaphthoquinone derivative is selected from the group consisting of 2-methylnaphtho[2,3-b]furan-4,9-dione, 2-acetylnaphtho [2,3-b]furan-4,9-dione, 2-(1-hydroxyethyl)naphtho[2,3-b] furan-4,9-dione, naphtho[2,3-b]furan-4,9-dione, 5(or 8)- hydroxy-2-(1-hydroxyethyl)naphtho[2,3-b]furan-4,9-dione, 5(or 8)-hydroxynaphtho[2,3-b]furan-4,9-dione, 2-methyl-5(or 8)-hydroxy-2-methylnaphtho[2,3-b]furan-4,9-dione, 1,3-dimethylisofuranonaphthoquinone, 2-(acetylethylenacetal) naphtho[2,3-b]furan-4,9-dione, 8-hydroxy-7-methoxynaphtho- [2,3-b]furan-4,9-dione, 3-acetyl-5,8-dimethoxy-2- methylnaphtho[2,3-b]furan-4,9-dione. A furanonaphthoquinone derivative as defined in claim 1 or claim 2 for the treatment of Chlamydia.

Inventors: HIRAI KEIICHI, KISHIMOTO TOSHIO, KOYAMA JUNKO, NAGATA KUMIKO, HIRAI, KEIICHI, KISHIMOTO, TOSHIO, KOYAMA, JUNKO, NAGATA, KUMIKO
Applicants: JAPAN SCIENCE & TECH CORP, JAPAN SCIENCE AND TECHNOLOGY CORPORATION
Application year: 2000
Main classification: C07D307
IPC codes: A61P31, A61K31, C07D307