JP6443926B2 - 新規メタロ−β−ラクタマ−ゼ阻害剤 - Google Patents
新規メタロ−β−ラクタマ−ゼ阻害剤 Download PDFInfo
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- JP6443926B2 JP6443926B2 JP2015061943A JP2015061943A JP6443926B2 JP 6443926 B2 JP6443926 B2 JP 6443926B2 JP 2015061943 A JP2015061943 A JP 2015061943A JP 2015061943 A JP2015061943 A JP 2015061943A JP 6443926 B2 JP6443926 B2 JP 6443926B2
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- metallo
- methyl
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- AVAACINZEOAHHE-VFZPANTDSA-N doripenem Chemical compound C=1([C@H](C)[C@@H]2[C@H](C(N2C=1C(O)=O)=O)[C@H](O)C)S[C@@H]1CN[C@H](CNS(N)(=O)=O)C1 AVAACINZEOAHHE-VFZPANTDSA-N 0.000 description 1
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- UWYHMGVUTGAWSP-JKIFEVAISA-N oxacillin Chemical compound N([C@@H]1C(N2[C@H](C(C)(C)S[C@@H]21)C(O)=O)=O)C(=O)C1=C(C)ON=C1C1=CC=CC=C1 UWYHMGVUTGAWSP-JKIFEVAISA-N 0.000 description 1
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Landscapes
- Furan Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
(1) 下記一般式(I)で表される化合物又はその薬理学的に許容される塩を有効成分として含有する、メタロ−β−ラクタマ−ゼ阻害剤:
ここで、置換基は、直鎖若しくは分岐状のC1〜6アルコキシ基、及びオキソ基から選択される基である]。
(2) R1が、1以上の置換基で置換されていても良い直鎖若しくは分岐状のC2〜6アルケニル基であり、かつ、R2が、1以上の置換基で置換されていても良い直鎖若しくは分岐状のC1〜6アルキル基である、(1)に記載のメタロ−β−ラクタマ−ゼ阻害剤。
(3) (1)又は(2)に記載のメタロ−β−ラクタマ−ゼ阻害剤と、β−ラクタム薬とを有効成分として含有する、メタロ−β−ラクタマ−ゼ産生菌感染症治療薬又は予防薬。
(4) 下記一般式(II)で表される化合物又はその薬理学的に許容される塩:
(5) R3が、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、又はt−ブチル基である、(4)に記載の化合物又はその薬理学的に許容される塩。
(6) R3が、エチル基、プロピル基、又はイソプロピル基である、(4)に記載の化合物又はその薬理学的に許容される塩。
(1)ODTAAの製造
ODTAAはすでに報告されている合成法により調製した〔R.M.Adlington et al.Synlett(2002)820−822〕。
300mgのODTAAにメタノ−ル2mL、6M塩酸50μLを添加し、室温で1日反応させた。反応液を逆相HPLCのPegasil ODS SP100(20φ×250mm)により精製した。0.1%トリフルオロ酢酸を含む40%アセトニトリル水溶液を移動相とし、9mL/分の流速において生成物を分取し濃縮乾固することにより、184mgのODTAAメチルエステルを得た。
1H−NMR δ(ppm)7.26,6.33,3.68,2.82,2.67,2.32,1.12。
13C−NMR δ(ppm)172.0,165.7,164.1,150.0,138.1,136.4,116.1,52.0,31.2,27.4,12.4。
300mgのODTAAにエタノ−ル2mL、6M塩酸50μLを添加し、室温で4日反応させた。反応液を逆相HPLCのPegasil ODS SP100(20φ×250mm)により精製した。0.1%トリフルオロ酢酸を含む40%アセトニトリル水溶液を移動相とし、9mL/分の流速において生成物を分取し濃縮乾固することにより、180mgのODTAAエチルエステルを得た。
1H−NMR δ(ppm)7.26,6.33,4.13,2.82,2.66,2.32,1.25,1.12。
13C−NMR δ(ppm)171.6,165.7,164.2,149.9,138.0,136.6,116.2,61.0,31.5,27.4,19.4,14.1,12.5。
300mgのODTAAにイソプロパノ−ル2mL、6M塩酸50μLを添加し、室温で4日反応させた。反応液を逆相HPLCのPegasil ODS SP100(20φ×250mm)により精製した。0.1%トリフルオロ酢酸を含む40%アセトニトリル水溶液を移動相とし、9mL/分の流速において生成物を分取し濃縮乾固することにより、155mgのODTAAイソプロピルエステルを得た。
1H−NMR δ(ppm)7.26,6.33,4.99,2.81,2.64,2.33,1.22,1.22,1.12。
13C−NMR δ(ppm)171.1,165.7,164.1,149.8,137.9,136.7,116.2,68.5,31.7,27.4,21.7,21.7,19.5,12.4。
(実施例2)2,5−ジヒドロフラン−2,5−ジオン誘導体がメタロ−β−ラクタマーゼ産生菌に対するメロペネムの抗菌活性に与える影響(阻止円形成)
IMP−1型MBLを産生するEscherichia coli KB366、Klebsiella pneumoniae KB365およびPseudomonas aeruginosa KB370を、5μg/mLのセフタジジムを含むミュラ−−ヒントン液体培地にそれぞれ一白金耳植菌し、24時間37℃で前培養した。ミュラ−−ヒントン寒天培地72mL、メロペネム水溶液9mL(終濃度:E.coli,0.06μg/mL、K.pneumoniae,0.5μg/mL、P.aeruginosa,64μg/mL、いずれの濃度においてもメロペネムはこれらのMBL産生菌に抗菌活性を示さない)、ミュラ−−ヒントン液体培地9mL、前培養液100μLを混合し、角型シャ−レに20mL播いてプレ−トを作製した。各サンプルを1μg、3μg、10μg、30μg、100μg、しみ込ませた8mmペ−パ−ディスク(アドバンテック社)を置き、37℃で一晩静置培養した後、ノギスで阻止円径の大きさを計測し、その結果を表1に示した。
次に、ODTAAおよびその誘導体のFIC係数を、チェッカ−ボ−ド法を用いて調べた。IMP−1型MBLを産生するEscherichia coli KB366を10μg/mLのセフタジジムを含むミュラ−−ヒントン液体培地に一白金耳植菌し、24時間37℃で前培養した。96穴プレ−トを使用し、1行目に終濃度0.75μg/mLになるようにメロペネム水溶液を添加し7行目までの2倍希釈系列を作製した(濃度範囲:0.75−0.01μg/mL)。12列目にODTAAとその誘導体を終濃度750μg/mLになるように添加し、2列目までの2倍希釈系列を作製した(濃度範囲:750−0.73μg/mL)。被検菌液を1.0×106CFU/mL接種し最終液量が100μLになるようミュラ−−ヒントン液体培地を添加した。24時間37℃で培養した後、吸光度を測定し、各条件のMICを求めた。それに基づいてFIC係数を算出し、表2に示した。なお薬剤Aと薬剤BのFIC係数は下記式で算出される。
Aの併用時のMIC Bの併用時のMIC
FIC係数=─────────+─────────
Aの単独時のMIC Bの単独時のMIC
酵素は大腸菌で発現させた組換えIMP−1型MBLを用いた。β−ラクタマ−ゼ反応の基質はニトロセフィン(メルク・ミリポア社)を用いた。ニトロセフィンはβ−ラクタマ−ゼにより開環することで極大吸収波長が391nmから491nmに変化する。これを基質として阻害剤を添加したときの阻害活性を測定した。96穴プレ−トに終濃度0.5nMになるように調製した酵素液10μL、終濃度10、50、100、500μMになるように調製したODTAAおよびその誘導体溶液各10μL、終濃度20μg/mLのBSAおよび終濃度100μMの塩化亜鉛を含む50mM HEPES(pH7.5)バッファ−170μLを混ぜ、室温で10分プレインキュベ−トした。終濃度0、20、40、60、80、100、120μMの異なる濃度のニトロセフィン溶液10μLを添加し、30℃にて30秒おきに485nmの吸光度を測定した。吸光度から濃度への換算は、モル吸光係数ε485=17,420M−1cm−1を使用し、ODTAAおよびその誘導体のKi値をディクソンプロットにより算出し、その結果を表3に示した。
Claims (6)
- R1が、1以上の置換基で置換されていても良い直鎖若しくは分岐状のC2〜6アルケニル基であり、かつ、R2が、1以上の置換基で置換されていても良い直鎖若しくは分岐状のC1〜6アルキル基である、請求項1に記載のメタロ−β−ラクタマ−ゼ阻害剤。
- 請求項1又は請求項2に記載のメタロ−β−ラクタマ−ゼ阻害剤と、β−ラクタム薬とを有効成分として含有する、メタロ−β−ラクタマ−ゼ産生菌感染症治療薬又は予防薬。
- R3が、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、又はt−ブチル基である、請求項4に記載の化合物又はその薬理学的に許容される塩。
- R3が、エチル基、プロピル基、又はイソプロピル基である、請求項4に記載の化合物又はその薬理学的に許容される塩。
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