JP7318950B2 - β-ラクタマーゼ阻害剤 - Google Patents
β-ラクタマーゼ阻害剤 Download PDFInfo
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- JP7318950B2 JP7318950B2 JP2020519856A JP2020519856A JP7318950B2 JP 7318950 B2 JP7318950 B2 JP 7318950B2 JP 2020519856 A JP2020519856 A JP 2020519856A JP 2020519856 A JP2020519856 A JP 2020519856A JP 7318950 B2 JP7318950 B2 JP 7318950B2
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- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008261 resistance mechanism Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- IKQNRQOUOZJHTR-UWBRJAPDSA-N ritipenem Chemical compound S1C(COC(N)=O)=C(C(O)=O)N2C(=O)[C@H]([C@H](O)C)[C@H]21 IKQNRQOUOZJHTR-UWBRJAPDSA-N 0.000 description 1
- 229950004286 ritipenem Drugs 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010898 silica gel chromatography Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007901 soft capsule Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- HKSZLNNOFSGOKW-FYTWVXJKSA-N staurosporine Chemical compound C12=C3N4C5=CC=CC=C5C3=C3CNC(=O)C3=C2C2=CC=CC=C2N1[C@H]1C[C@@H](NC)[C@@H](OC)[C@]4(C)O1 HKSZLNNOFSGOKW-FYTWVXJKSA-N 0.000 description 1
- CGPUWJWCVCFERF-UHFFFAOYSA-N staurosporine Natural products C12=C3N4C5=CC=CC=C5C3=C3CNC(=O)C3=C2C2=CC=CC=C2N1C1CC(NC)C(OC)C4(OC)O1 CGPUWJWCVCFERF-UHFFFAOYSA-N 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 229940031000 streptococcus pneumoniae Drugs 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 239000007929 subcutaneous injection Substances 0.000 description 1
- 238000010254 subcutaneous injection Methods 0.000 description 1
- 229960004932 sulbenicillin Drugs 0.000 description 1
- 239000000829 suppository Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000003826 tablet Substances 0.000 description 1
- SOROUYSPFADXSN-SUWVAFIASA-N talampicillin Chemical compound C1([C@@H](N)C(=O)N[C@H]2[C@H]3SC([C@@H](N3C2=O)C(=O)OC2C3=CC=CC=C3C(=O)O2)(C)C)=CC=CC=C1 SOROUYSPFADXSN-SUWVAFIASA-N 0.000 description 1
- 229960002780 talampicillin Drugs 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 125000001935 tetracenyl group Chemical group C1(=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C12)* 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 229960004659 ticarcillin Drugs 0.000 description 1
- OHKOGUYZJXTSFX-KZFFXBSXSA-N ticarcillin Chemical compound C=1([C@@H](C(O)=O)C(=O)N[C@H]2[C@H]3SC([C@@H](N3C2=O)C(O)=O)(C)C)C=CSC=1 OHKOGUYZJXTSFX-KZFFXBSXSA-N 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000005270 trialkylamine group Chemical group 0.000 description 1
- 238000002525 ultrasonication Methods 0.000 description 1
- 210000003556 vascular endothelial cell Anatomy 0.000 description 1
- 229940118696 vibrio cholerae Drugs 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
- 239000002132 β-lactam antibiotic Substances 0.000 description 1
Images
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
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- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
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- C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
- C07D333/26—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D333/38—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
- A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
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- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/30—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
- C07D207/34—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/30—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
- C07D207/34—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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Description
で表される化合物、又はその塩、水和物若しくは溶媒和物を含有する、β-ラクタマーゼ阻害剤。
で表される化合物、又はその塩、水和物若しくは溶媒和物を含有する、β-ラクタム系抗菌化合物の抗菌効果の増強剤。
で表される化合物、又はその塩、水和物若しくは溶媒和物、並びにβ-ラクタム系抗菌化合物を含有する、抗菌剤。
一般式(1):
で表される化合物、又はその塩、水和物若しくは溶媒和物と併用投与されるように用いられる抗菌剤。
で表される化合物、又はその塩、水和物若しくは溶媒和物。
本発明は、その一態様において、一般式(1):
R1は-C(-RA)-を示す。R2は-N(-RB)n-、-O-、又は-C(-RA)-を示す。R3は、R2が-N(-RB)n-又は-O-の場合は-C(-RA)-を示し、R2が-C(-RA)-の場合は-S-を示す。R2は好ましくは-N(-RB)n-である。
一般式(1)中、実線と点線の二重線で表される結合は、単結合又は二重結合を示す。該結合を含む、一般式(1)中の一般式(A):
で表される部分構造中の5員環は、特に制限されない。該5員環は、好ましくは平面性を有するものである。該5員環の具体例としては、フラン、ピロール、チオフェン等が挙げられ、より好ましくはフラン、ピロール等が挙げられ、さらに好ましくはピロールが挙げられる。
R6は水素原子又は炭化水素基を示す。本発明のある態様においては、好ましくは、R6が水素原子である。R6で示される炭化水素基については、RAについての上記記載と同様である。
R7及びR8は同一又は異なって、水素原子又は炭化水素基を示し、或いはR7及びR8は互いに結合して隣接する窒素原子と共に環を形成する。本発明のある態様においては、好ましくはR7及びR8は同一又は異なって、水素原子又は炭化水素基を示し、より好ましくは、R7及びR8の内の少なくとも一方が水素原子であり、さらに好ましくはR7及びR8は共に水素原子である。
R71及びR72で示されるアルキル基については、RAについての上記記載と同様である。R71及びR72各々について、複数存在する場合は、同一の炭素原子に結合していてもよいし、互いに異なる炭素原子に結合していてもよい。
本発明の一態様において、一般式(1)の中でも、好ましくは一般式(1A):
が挙げられる。
が挙げられる。
R2は、-N(-RB)-又は-O-を示す。
RAは同一又は異なって、水素原子、アミノ基で置換されていてもよい直鎖状若しくは分岐鎖状アルキル基(但し、R2が-N(-RB)-の場合は炭素数1~5であり、R2が-O-の場合は炭素数2~5である)、アミノ基で置換されていてもよい炭素数3~7の環状アルキル基、又はアミノ基で置換されていてもよいフェニル基を示す。
RBは水素原子、直鎖状若しくは分岐鎖状アルキル基で置換されてもよいアミノ基、又はアミノ基で置換されていてもよいアルキル基を示す。
R6は水素原子を示す。
R7及びR8は同一又は異なって、水素原子又はアルキル基を示し(但し、R7及びR8の両方がアルキル基である場合を除く)、或いはR7及びR8は互いに結合して隣接する窒素原子と共に環を形成する。
一般式(1)で表される化合物には、立体異性体及び光学異性体が含まれ、これらは特に限定されるものではない。
一般式(1)で表される化合物の塩は、薬学的に許容される塩である限り、特に制限されるものではない。該塩としては、酸性塩、塩基性塩のいずれも採用することができる。酸性塩の例としては、塩酸塩、臭化水素酸塩、硫酸塩、硝酸塩、リン酸塩等の無機酸塩; 酢酸塩、プロピオン酸塩、酒石酸塩、フマル酸塩、マレイン酸塩、リンゴ酸塩、クエン酸塩、メタンスルホン酸塩、パラトルエンスルホン酸塩等の有機酸塩が挙げられ、塩基性塩の例としては、ナトリウム塩、及びカリウム塩等のアルカリ金属塩; 並びにカルシウム塩、マグネシウム塩等のアルカリ土類金属塩; アンモニアとの塩; モルホリン、ピペリジン、ピロリジン、モノアルキルアミン、ジアルキルアミン、トリアルキルアミン、モノ(ヒドロキシアルキル)アミン、ジ(ヒドロキシアルキル)アミン、トリ(ヒドロキシアルキル)アミン等の有機アミンとの塩等が挙げられる。
一般式(1)で表される化合物は、様々な方法で合成することができる。例えば、一般式(1)においてR6が炭化水素基(R6A)であり且つR7及びR8が共に水素原子である場合の化合物(化合物1d)は、例えば以下の反応式:
に従って又は準じて、合成することができる。
本工程では、化合物1a、ハロゲン化アルミニウム、及び二酸化炭素を反応させることで、化合物1bを得ることができる。
本工程では、化合物1b、R6A-OH、及びハロゲン化水素を反応させることで、化合物1cを得ることができる。
本工程では、化合物1c、ハロゲン化スルホニル酸、及び水酸化アンモニウムを反応させることで、化合物1dを得ることができる。この工程は、2段階で、即ち、化合物1cとハロゲン化スルホニル酸を反応させた後、得られた反応物と水酸化アンモニウムとを反応させることにより実行することもできる。
本発明の化合物は、β-ラクタマーゼ阻害活性、β-ラクタム系抗菌化合物の抗菌効果の増強活性等を有する。このため、本発明の化合物は、医薬、試薬等(本明細書において、「本発明の薬剤」と示すこともある。)の有効成分として、より具体的には、β-ラクタマーゼ阻害剤、β-ラクタム系抗菌化合物の抗菌効果の増強剤等の有効成分としての利用が可能である。また、本発明の化合物のβ-ラクタマーゼ阻害活性、β-ラクタム系抗菌化合物の抗菌効果の増強活性等を利用して、本発明の化合物及びβ-ラクタム系抗菌化合物を含有する、抗菌剤、さらにはβ-ラクタム系抗菌化合物を含有する、本発明の化合物と併用投与されるように用いられる抗菌剤(これらも、本明細書において、「本発明の薬剤」と示すこともある。)、等を提供することもできる。
以下に示される化合物A~Iを準備した。
1H-NMR (400 MHz, DMSO_d6): δ 1.98-2.00 (m, 1 H), 2.14 (s, 6 H), 7.08 (s, 1 H), 7.33-7.36 (m, 2 H), 7.58-7.61 (m, 3 H). MS Calcd.: 294; MS Found: 295.1([M+1]+)。
1H-NMR (400 MHz, CD3OD): δ 2.35 (d, J= 1.6 Hz, 2 H), 2.48 (d, J= 8.0 Hz, 6 H), 3.46 (s, 3 H). MS Calcd.: 232; MS Found: 233.1([M+1]+)。
1H-NMR (400 MHz, CDCl3): δ 5.66 (s, 2 H), 3.00-3.04 (m, 4 H), 1.24-1.30 (m, 6 H). MS Calcd.: 247; MS Found: 248.1([M+1]+)。
1H-NMR (400 MHz, CD3OD): δ 2.92-2.99 (m, 4 H), 1.66-1.76 (m, 4 H), 0.94-0.99 (m, 6 H). MS Calcd.: 275; MS Found: 276.0([M+1]+)。
1H-NMR (400 MHz, CDCl3): δ 1.45-2.12 (m, 16 H), 3.83-3.95 (m, 2 H). MS Calcd: 327; MS Found: 326.0([M-1]-)。
1H-NMR (400 MHz, CD3OD): δ 3.45 (s, 3 H), 2.88-2.94 (m, 4 H), 1.04-1.11 (m, 6 H). MS Calcd.: 260; MS Found: 261.1([M+1]+)。
各化合物について、活性、複合体構造、毒性等を解析した(試験例1~7)。
96穴あるいは384穴U底プレート、ミューラーヒントン液体培地、抗菌薬(セフタジジム[CAZ]、イミペネム[IPM]、メロペネム[MPM]、ドリペネム[DPM]、ビアペネム[BPM]を用いて、薬剤感受性試験測定用プレートを作製した。96穴等U底プレートA系列左端のウェル1に抗菌薬が最大濃度含まれるように調整し、右隣のウェル2は抗菌薬濃度が1/2に、さらにその右隣のウェル3は抗菌薬濃度1/4となるよう、1/2抗菌薬希釈系列をウェル11まで作製した。ウェル12は抗菌薬を含まないブランクウェルとした。B及びC系列にもA系列同様に抗菌薬の希釈系列を作製した。さらに、B及びC系列には、それぞれ被験物質(化合物A)を10 μg/mL、50 μg/mL添加した(図1)。
各種クラスB β-ラクタマーゼ(IMP-1、NDM-1、又はVIM-2:最終濃度 10 nM)、イミペネム(最終濃度 100μM)、被験物質(化合物A、化合物Z=下記に示す:最終濃度 0、1、10、100μM)を HEPES バッファー中で混和した。吸光度298 nm、30℃条件下におけるイミペネム分解活性(Δabs/min)を測定した。被験物質未添加時のイミペネム分解活性を100%とし、各々被験物質添加時のイミペネム残存分解活性をプロットした。
被検菌として、クラスB β-ラクタマーゼを産生する腸内細菌科細菌の各種株を使用する以外は、試験例1と同様にして行った。
被検菌として、クラスB β-ラクタマーゼを産生するアシネトバクターの各種株を使用する以外は、試験例1と同様にして行った。
<IMP-1と被験物質との複合体構造解析>
IMP-1を産生する大腸菌[pET9a-ΔIMP-1/E. coli BL21 (DE3)]を液体培養し、遠心操作より菌体を回収した。菌体を超音波にて破砕後、超遠心操作により可溶性画分と不溶性画分を分離した。可溶性画分を陽イオン交換カラム、疎水相互作用カラム、ゲル濾過カラムの順に通し、IMP-1を精製した。限外濾過カラムを使用し、精製したIMP-1をHEPES バッファーに置換の後、濃縮した。精製したIMP-1 (15 mg/mL)とリザーバー溶液[100 mM HEPES (pH 7.5)、200 mM Sodium acetate、25% PEG3350]を混和し、20℃でインキュベーションすることにより、IMP-1の結晶を得た。IMP-1結晶を、被験物質(化合物A)を溶解した上記リザーバー溶液に浸潤することで、IMP-1と被験物質との複合体結晶を作製した。複合体結晶をシンクロトロンに持ち込み、X線放射光を照射し回折データの回収を行った。公開されているIMP-1の構造情報を使用し、分子置換法にて位相を決定した。精密化にはRefmac5を、モデル構築にはcootを使用した。
VIM-2を産生する大腸菌[pET29a-VIM-2/E. coli BL21 (DE3)]を液体培養し、遠心操作より菌体を回収した。菌体を超音波にて破砕後、超遠心操作により可溶性画分と不溶性画分を分離した。可溶性画分を陰イオン交換カラム、疎水相互作用カラム、ゲル濾過カラムの順に通し、VIM-2を精製した。限外濾過カラムを使用し、精製したVIM-2をTris-HCl バッファーに置換の後、濃縮した。精製したVIM-2 (15 mg/mL)とリザーバー溶液[200 mM Magnesium Formate、25% PEG3350]を混和し、20℃でインキュベーションすることにより、VIM-2の結晶を得た。VIM-2結晶を、被験物質(化合物A)を溶解した上記リザーバー溶液に浸潤することで、VIM-2と被験物質との複合体結晶を作製した。複合体結晶をシンクロトロンに持ち込み、X線回折データの回収を行った。公開されているVIM-2の構造情報を使用し、分子置換法にて位相を決定した。精密化にはRefmac5を、モデル構築にはcootを使用した。
NDM-1を産生する大腸菌[pET28a-NDM-1/E. coli BL21 (DE3)]を液体培養し、遠心操作より菌体を回収した。菌体を超音波にて破砕後、超遠心操作により可溶性画分と不溶性画分を分離した。可溶性画分をニッケルカラム、陰イオン交換カラム、ゲル濾過カラムの順に通し、NDM-1を精製した。限外濾過カラムを使用し、精製したNDM-1をTris-HClバッファーに置換の後、濃縮した。精製したNDM-1 (40 mg/mL)とリザーバー溶液[100 mM Bis-Tris (pH 6.1)、200 mM Ammonium Sulfate、25% PEG3350]を混和し、20℃でインキュベーションすることにより、NDM-1の結晶を得た。NDM-1結晶を、被験物質(化合物A、又は化合物I)を溶解した上記リザーバー溶液に浸潤することで、NDM-1と被験物質との複合体結晶を作製した。複合体結晶をシンクロトロンに持ち込み、X線回折データの回収を行った。公開されているNDM-1の構造情報を使用し、分子置換法にて位相を決定した。精密化にはRefmac5を、モデル構築にはcootを使用した。
結果を図5~8に示す。図5~8に示されるように、被検物質は、IPM-1、VIM-2、NDM-1と、そのスルファモイル基及びカルボキシ基を介して相互作用することが分かった。一方、これらの基が連結されている側と反対側(一般式(1)のR1、R2及びR3側)と、IPM-1、VIM-2、及びNDM-1との間には一定の空間があり、この反対側の構造は自由度が高いと考えられた。
薬剤感受性試験は、被検物質として化合物A~C及びE~Iを用いる以外は、試験例1と同様にして行った。
HeLa細胞に各種濃度の被験物質(化合物A)又はスタウロスポリンを添加し、MTTアッセイキット(Promega cat no. G4000)を用いて生細胞をカウントした。
被検物質(化合物A)を被検物質として、Ames試験をUBE科学分析センター社に委託して行った。その結果、化合物AはAmes試験陰性であることが分かった。
下記の合成ルートにより目的物8(化合物X2a、X2b、X2c、X2d、及びX4)を合成した。
3-オキソ吉草酸エチル1a とブロモアセトン2d のカップリングを行い、ジケトエステル3ad を合成した。即ち、撹拌子を備えた50 mL 三口フラスコに、窒素雰囲気下で水素化ナトリウム(60% in 流動パラフィン, 960 mg, 24.00 mmol, 1.20 eq.)及びTHF(35 mL)を加え、氷冷した。次いで得られた灰色懸濁に、3-オキソ吉草酸エチル1a(2.85 mL, 20.00 mmol)をシリンジを用いてneat で滴下した。この時発泡を確認した。氷浴にてさらに30 分撹拌した後、ブロモアセトン2d(3.00 g, 22.00 mmol, 1.10 eq.)のTHF 溶液(15 mL)を素早く加えた。さらに1 時間後にTLC で分析(UV、リンモリブデン酸)したところ、原料1a の消失と1 つの新たなスポットの生成が確認された(展開溶媒:ヘキサン/酢酸エチル= 9/1、Rf 値:0.3)。そこで反応混合物に飽和塩化アンモニウム水溶液及び酢酸エチルを加えて反応を停止した。2 層を分離した後、水層を酢酸エチルで抽出し、合わせた有機層を飽和塩化ナトリウム水溶液で洗浄し、硫酸ナトリウムを加えて乾燥した。乾燥剤をろ別後、ろ液を減圧下濃縮したところ橙色油状物質4.33 g が得られ、得られた粗生成物をシリカゲルカラムクロマトグラフィーにて精製した(計2 回、使用シリカゲル(1)(2)(各150 g)。溶出として、(1)ヘキサン/酢酸エチル= 9/1(2 L)→1/1(700 mL)、(2)ヘキサン/酢酸エチル= 4/1(2 L)を使用した。目的物のフラクションを濃縮した結果、目的のジケトエステル3ad を2.50 g(収率62%)、淡黄色液体で得た。
1H-NMR (400 MHz, DMSO_d6): δ 1.06 (t, J = 6.0 Hz, 3H), 2.42 (s, 3H), 2.94 (q, J = 6.0Hz,2H), 3.42 (s, 3H), 3.5-9.0 (bs, 3H); 13C-NMR (100 MHz, DMSO-d6): 11.0, 14.3, 30.5, 48.0, 108.9, 121.4, 130.5, 140.4, 168.0; MS Calcd.: 245.06; MS Found: 245.03 ([M-1]-)。
合成例7-1と同様にして化合物X2bを合成した。化合物X2bを淡褐色固体として得た(収率33%、HPLC 純度95.9%)。
1H-NMR (400 MHz, DMSO_d6): δ1.06 (t, J = 6.0 Hz, 3H), 2.41 (s, 3H), 2.92 (q, J = 6.0 Hz, 2H), 3.44 (s, 3H), 6.91 (bs, 2H, -SONH2); 13C-NMR (100 MHz, DMSO-d6): 11.4, 14.8, 17.3, 30.2, 109.8, 120.8, 135.1, 136.5, 165.4; MS Calcd.: 245.06; MS Found: 245.05 ([M-1]-)。
合成例7-1と同様にして化合物X2cを合成した。化合物X2cを淡褐色固体として得た(収率13%、HPLC 純度96.0%)。
1H-NMR (400 MHz, DMSO-d6):δ 1.16 (t, J = 6.0 Hz, 3H), 2.95 (q, J = 6.0 Hz, 2H), 3.24(s, 3H), 6.84 (bs, 2H, -SONH2), 12.8 (bs, 1H, -COOH); 13C-NMR (100 MHz, DMSO-d6): 14.0, 18.1, 31.9, 108.6, 123.1, 128.1, 128.8, 131.3, 131,6, 135.1, 142.2, 166.6.; MS Calcd.: 307.08; MS Found: 307.09 ([M-1]-)。
合成例7-1と同様にして化合物X2dを合成した。化合物X2dを淡黄色固体として得た(収率24%、HPLC 純度99.3%)。
1H-NMR (400 MHz, DMSO_d6):δ 1.14 (t, J = 6.0 Hz, 3H), 2.98 (q, J = 5.6 Hz, 2H), 3.27 (s, 3H), 7.10 (bs, 2H, -SONH2), 7.32 (m, 2H), 7.41 (m, 3H), 12.3 (bs, 1H, -COOH); 13C-NMR (100 MHz, DMSO-d6): 14.5, 31.8, 39.5, 121.3, 128.3, 128.4, 128.5, 131.1, 132.2, 136.7, 136.8, 160.0; MS Calcd.: 307.08; MS Found: 307.03 ([M-1]-)。
合成例7-1と同様にして化合物X4を合成した。化合物X4を淡黄色固体として得た(収率24%、HPLC 純度87.5%)。
1H-NMR (400 MHz, DMSO_d6):δ1.06 (t, J = 6.0 Hz, 3H), 1.27 (d, J = 6.0 Hz, 6H), 2,83 (q, J = 6.0 Hz, 2H), 2.90 (m, 1H), 3.60 (s, 3H), 4.27 (bs, 1H, -COOH), 6.95 (bs, 2H, -SONH2); MS Calcd.: 273.09; MS Found: 273.06 ([M-1]-)。
1H-NMR (400 MHz, DMSO-d6): δ 1.09 (t, J = 6.0 Hz, 3H), 1.09 (t, J = 7.2 Hz, 3H), 2.91-2.98 (m, 4H), 5.64 (bs, 2H, -N-NH2), 7.24 (bs, 2H, -SONH2). 13C-NMR (100 MHz, DMSO-d6): δ 1.09。
化合物X3bを以下のようにして合成することができる。
試験例9.酵素活性測定試験
メタロ-β-ラクタマーゼ(IMP-1)(最終濃度 10 nM)を使用し且つ基質としてイミペネム(最終濃度 100μM)を使用し、阻害剤となる被験物質(化合物No.9-7、No.9-8、No.9-9)の濃度をそれぞれ変化させ(0μM、10μM、100μM)、各ポイントにおける吸光度298 nm、30℃条件下のイミペネム分解活性(Δabs/min)を測定した。被検物質0の場合の活性を100%として、被検物質を添加した場合の活性相対値を算出した。
阻害剤となる被検物質としてX2a、X2b、X2c、X2d、X3a、及びX4を用いる以外は、試験例1と同様にして行った。阻害剤濃度は10μg/mLとした。
阻害剤となる被検物質としてX2a、X2b、X2c、X2d、X3a、及びX4を用いる以外は、試験例6と同様にして行った。
実験用菌株(クラスB β-ラクタマーゼ(IMP-1)をコードするプラスミドが導入された大腸菌株)をマウスに感染させた後、被検物質(化合物A)を投与し、生死を観察した。具体的には以下のようにして行った。
実験用菌株として、クラスB β-ラクタマーゼ(IMP-1)をコードするプラスミドが導入された大腸菌株に加え、NDM及びVIMをコードするプラスミドが導入された細菌(K.pnuemoniae)を使用し、被検物質として化合物Iを投与した。抗菌薬投与量は0.8mg/kg又は4mg/kg、被検物質投与量は10mg/kgとした。これら以外は、試験例12と同様にして行った。
実験用菌株として、NDM及びVIMをコードするプラスミドが導入された細菌(K.pnuemoniae)を使用し、被検物質として化合物X2dを投与した。抗菌薬投与量は2mg/kg又は8mg/kg、被検物質投与量は10mg/kgとした。これら以外は、試験例12と同様にして行った。
Claims (9)
- 一般式(1):
で表される化合物、又はその塩、水和物若しくは溶媒和物を含有する、クラスB β-ラクタマーゼ阻害剤。 - 前記β-ラクタマーゼがクラスB1 β-ラクタマーゼである、請求項1に記載の阻害剤。
- 一般式(1):
で表される化合物、又はその塩、水和物若しくは溶媒和物を含有する、β-ラクタム系抗菌化合物の抗菌効果の増強剤。 - 一般式(1):
で表される化合物、又はその塩、水和物若しくは溶媒和物、並びにβ-ラクタム系抗菌化合物を含有する、抗菌剤。 - β-ラクタム系抗菌化合物を含有する、請求項1又は2に記載の阻害剤との併用投与に用いるための抗菌剤。
- 一般式(1A):
で表される化合物、又はその塩、水和物若しくは溶媒和物。 - RBで示されるアルキル基が炭素数1~4の直鎖状アルキル基である、請求項6に記載の化合物、又はその塩、水和物若しくは溶媒和物。
- 請求項6又は7に記載の化合物、又はその塩、水和物若しくは溶媒和物を含有する、医薬。
- 請求項6又は7に記載の化合物、又はその塩、水和物若しくは溶媒和物を含有する、試薬。
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