JP4027406B2 - フタラジノン誘導体 - Google Patents
フタラジノン誘導体 Download PDFInfo
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- JP4027406B2 JP4027406B2 JP2006505955A JP2006505955A JP4027406B2 JP 4027406 B2 JP4027406 B2 JP 4027406B2 JP 2006505955 A JP2006505955 A JP 2006505955A JP 2006505955 A JP2006505955 A JP 2006505955A JP 4027406 B2 JP4027406 B2 JP 4027406B2
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- 0 *CC(*)(*)CN(CICCC(O)=O)C(c1c(*)ccc(CC(c2ccccc22)=NNC2=O)c1)=O Chemical compound *CC(*)(*)CN(CICCC(O)=O)C(c1c(*)ccc(CC(c2ccccc22)=NNC2=O)c1)=O 0.000 description 2
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- A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
- A61K31/50—Pyridazines; Hydrogenated pyridazines
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Description
AとBは一緒になって、場合によっては置換されていてもよい縮合芳香環を表し、
Xは、NRXまたはCRXRYとすることができ、
X=NRXである場合にはnは1または2であり、X=CRXRYである場合にはnは1であり、
RXは、H、場合によっては置換されていてもよいC1-20アルキル、C5-20アリール、C3-20ヘテロシクリル、アミド、チオアミド、エステル、アシルおよびスルホニル基からなる群から選択され、
RYは、H、ヒドロキシ、アミノから選択され、
あるいはRXとRYは一緒になって、スピロ-C3-7シクロアルキルまたはヘテロシクリル基を形成することができ、
RC1およびRC2はともに水素であり、またはXがCRXRYであるときには、RC1、RC2、RXおよびRYは、それらが結合している炭素原子と一緒になって、場合によっては置換されていてもよい縮合芳香環を形成することができ、
R1は、Hおよびハロから選択される)
したがって、XがCRXRYである場合にはnは1であり、本化合物は式(Ia)となる。
「芳香環」という用語は、本明細書では、環式芳香族構造、すなわち、非局在π-電子軌道を有する環式構造を指す従来の意味で使用される。
飽和単環式炭化水素化合物:
シクロプロパン(C3)、シクロブタン(C4)、シクロペンタン(C5)、シクロヘキサン(C6)、シクロヘプタン(C7)、メチルシクロプロパン(C4)、ジメチルシクロプロパン(C5)、メチルシクロブタン(C5)、ジメチルシクロブタン(C6)、メチルシクロペンタン(C6)、ジメチルシクロペンタン(C7)、メチルシクロヘキサン(C7)、ジメチルシクロヘキサン(C8)、メンタン(C10);
不飽和単環式炭化水素化合物:
シクロプロペン(C3)、シクロブテン(C4)、シクロペンテン(C5)、シクロヘキセン(C6)、メチルシクロプロペン(C4)、ジメチルシクロプロペン(C5)、メチルシクロブテン(C5)、ジメチルシクロブテン(C6)、メチルシクロペンテン(C6)、ジメチルシクロペンテン(C7)、メチルシクロヘキセン(C7)、ジメチルシクロヘキセン(C8);
飽和多環式炭化水素化合物:
ツジャン(C10)、カラン(C10)、ピナン(C10)、ボルナン(C10)、ノルカラン(C7)、ノルピナン(C7)、ノルボルナン(C7)、アダマンタン(C10)、デカリン(デカヒドロナフタレン)(C10);
不飽和多環式炭化水素化合物:
カンフェン(C10)、リモネン(C10)、ピネン(C10);
芳香環を有する多環式炭化水素化合物:
インデン(C9)、インダン(例えば、2,3-ジヒドロ-1H-インデン)(C9)、テトラリン(1,2,3,4-テトラヒドロナフタレン)(C10)、アセナフテン(C12)、フルオレン(C13)、フェナレン(C13)、アセフェナントレン(C15)、アセアントレン(C16)、コラントレン(C20)
に由来するものが挙げられるが、これらだけに限定されない。
N1:アジリジン(C3)、アゼチジン(C4)、ピロリジン(テトラヒドロピロール)(C5)、ピロリン(例えば、3-ピロリン、2,5-ジヒドロピロール)(C5)、2H-ピロールまたは3H-ピロール(イソピロール、イソアゾール)(C5)、ピペリジン(C6)、ジヒドロピリジン(C6)、テトラヒドロピリジン(C6)、アゼピン(C7);
O1:オキシラン(C3)、オキセタン(C4)、オキソラン(テトラヒドロフラン)(C5)、オキソール (ジヒドロフラン)(C5)、オキサン(テトラヒドロピラン)(C6)、ジヒドロピラン(C6)、ピラン(C6)、オキセピン(C7);
S1:チイラン(C3)、チエタン(C4)、チオラン(テトラヒドロチオフェン)(C5)、チアン(テトラヒドロチオピラン)(C6)、チエパン(C7);
O2:ジオキソラン(C5)、ジオキサン(C6)およびジオキセパン(C7);
O3:トリオキサン(C6);
N2:イミダゾリジン(C5)、ピラゾリジン(ジアゾリジン)(C5)、イミダゾリン(C5)、ピラゾリン(ジヒドロピラゾール)(C5)、ピペラジン(C6);
N1O1:テトラヒドロオキサゾール(C5)、ジヒドロオキサゾール(C5)、テトラヒドロイソオキサゾール(C5)、ジヒドロイソオキサゾール(C5)、モルホリン(C6)、テトラヒドロオキサジン(C6)、ジヒドロオキサジン(C6)、オキサジン(C6);
N1S1:チアゾリン(C5)、チアゾリジン(C5)、チオモルホリン(C6);
N2O1:オキサジアジン(C6);
O1S1:オキサチオール(C5)およびオキサチアン(チオキサン)(C6);ならびに
N1O1S1:オキサチアジン(C6)
に由来するものなどが挙げられるが、これらだけに限定されない。
上記のものには、公知のイオン型、塩型、溶媒和物型およびこれら置換基の保護型が含まれる。例えば、カルボン酸(−COOH)についての言及は、アニオン(カルボキシレート)型(−COO−)、それの塩もしくは溶媒和物、ならびに従来の保護型をも含むものである。同様に、アミノ基についての言及は、プロトン化型(−N+HR1R2)、アミノ基の塩もしくは溶媒和物(例:塩酸塩)ならびにアミノ基の従来の保護型を含むものである。同様に、ヒドロキシル基についての言及は、アニオン型(−O−)、それの塩または溶媒和物、ならびにヒドロキシル基の従来の保護型をも含むものである。
ある種の化合物は、1以上の特定の幾何型、光学型、エナンチオマー型、ジアステレオマー型、エピマー型、立体異性体型、互変異、立体配座型またはアノマー型で存在する場合があり、それにはシスおよびトランス型;E型およびZ型;c、tおよびr型;エンドおよびエキソ型;R、Sおよびメソ型;DおよびL型;dおよびl型;(+)および(−)型;ケト、エノールおよびエノレート型;シンおよびアンチ型;シンクリナルおよびアンチクリナル型;αおよびβ型;アキシャルおよびエカトリアル型;ボート、チェア、ねじれ、包接および半チェア型;ならびにこれらの組み合わせなど(以下総称して「異性体」(または「異性体型」))があるが、これらに限定されるものではない。
簡便のため、多くの化学部分を公知の略称を用いて表す。それには、メチル(Me)、エチル(Et)、n−プロピル(nPr)、イソプロピル(iPr)、n−ブチル(nBu)、tert−ブチル(tBu)、n−ヘキシル(nHex)、シクロヘキシル(cHex)、フェニル(Ph)、ビフェニル(biPh)、ベンジル(Bn)、ナフチル(naph)、メトキシ(MeO)、エトキシ(EtO)、ベンゾイル(Bz)およびアセチル(Ac)などがあるが、これらに限定されるものではない。
以下の合成経路においては、便宜上、A-B縮合環を縮合ベンゼン環として示す。A-B環がベンゼン以外である化合物は、適切な別の出発材料を用いて、以下に示す方法と類似した方法によって合成することができる。
本発明は、活性化合物、具体的にはPARPの活性を阻害する活性を有する化合物を提供する。
活性化合物または活性化合物を含む医薬組成物は、全身投与/末梢投与であるか所望の作用部位とは無関係に、簡便な投与経路によって被験者に投与することができ、それには経口(例:経口摂取により);局所(例えば経皮、経鼻、眼球、口腔および舌下など);肺(例:例えばエアロゾルを用いた、例えば口もしくは鼻を介した吸入または通気療法);直腸;膣;例えば皮下、皮内、筋肉、静脈、動脈、心臓内、硬膜内、脊髄内、嚢内、被膜下、眼窩内、腹腔内、気管内、表皮下、関節内、クモ膜下および胸骨内などの注射による非経口;例えば皮下または筋肉でのデポー剤埋込物によるものなどがあるが、これらに限定されるものではない。
活性化合物を単独で投与することは可能であるが、それを1以上の製薬上許容される担体、補助剤、賦形剤、希釈剤、充填剤、緩衝剤、安定剤、保存剤、潤滑剤その他の当業者には公知の材料ならびに適宜に他の治療薬もしくは予防薬とともに、上記で定義の少なくとも1種類の活性化合物を含む医薬組成物(例えば、製剤)として提供することが好ましい。
活性化合物および活性化合物を含む組成物の適切な用量は患者ごとに変動し得ることは明らかであろう。至適用量の決定には通常、本発明の治療のリスクまたは有害な副作用に対する治療効果レベルのバランスを取る作業が関与する。選択される用量レベルは、これらに限定されるものではない、特定の化合物の活性、投与経路、投与時刻、化合物の排泄速度、治療期間、併用される他の薬剤、化合物および/または材料、ならびに患者の年齢、性別、体重、状態、全身の健康および病歴などの多様な要素によって決まる。化合物の量および投与経路は最終的には、医師の裁量に委ねられる。ただし一般に用量は、実質的に有害または有毒な副作用を起こすことなく、所望の効果を達成する作用部位での局所濃度を与えるようなものとする。
一般的実験方法
分取用HPLC
サンプルは、Waters 600 LC pump、Waters Xterra C18 column (5 μm, 19 mm * 50 mm) および Micromass ZQ mass spectrometer(陽イオンエレクトロスプレーイオン化モードで運転)を使用してWaters mass-directed purification systemにより精製した。移動相A(水中0.1%ギ酸)および移動相B(アセトニトリル中0.1%ギ酸)を勾配をつけて用いた(5%Bから100%Bへ7分間、3分間保持、流速20 ml/min)。
分析用HPLCをSpectra System P4000 pump および Hones Genesis C18 column (4 μm, 50 mm × 4.6 mm)を用いて行った。移動相A(水中0.1%ギ酸)および移動相B(アセトニトリル)を勾配をつけて用いた(5%Bを1分間、5分間後に98%Bに到達、3分間保持、流速2 ml/min)。検出はTSP UV 6000LP detector(254 nm UVおよびレンジ210-600 nm PDAにて)により行った。マススペクトルメーターはFinnigan LCQ(陽イオンエレクトロスプレーモードで運転)であった。
1H NMR および13C NMR は、Bruker DPX 300 spectometer を用いてそれぞれ300 MHzおよび75 MHz にて記録した。化学シフトは内部標準のテトラメチルシランを参照したδスケールにおけるppmで読み取った。別段の記載が無い限り、全てのサンプルはDMSO-d6中に溶解した。
b. 2-フルオロ-5-(4-オキソ-3,4-ジヒドロ-フタラジン-1-イルメチル)安息香酸(B)
2-フルオロ-5-(3-オキソ-3H-イソベンゾフラン-1-イリデンメチル)ベンゾニトリルの水(200ml)懸濁液に、水酸化ナトリウム水溶液(26.1gの50ml水溶液)を添加し、その反応混合物を窒素下で90℃に30分間加熱した。その反応混合物を少し冷却して70℃とし、ヒドラジン水和物(100ml)を添加し、70℃で18時間撹拌した。その反応物を室温に冷却し、2M HClを用いてpH4に酸性化した。その混合物を10分間撹拌し、ろ過した。得られた固体を水、へキサン、エーテル、酢酸エチルで洗浄し、乾燥させて淡桃色粉末の2-フルオロ-5-(4-オキソ-3,4-ジヒドロフタラジン-1-イルメチル)安息香酸(30.0g、77%)を得た。 m/z [M+1]+ 299 (96%純度)、δH 4.4 (2H, s)、7.2-7.3 (1H, m)、7.5-7.6 (1H, m)、7.8-8.0 (4H, m)、8.2-8.3 (1H, m)、12.6 (1H, s)。
b. 4-[4-フルオロ-3-(ピペラジン-1-カルボニル)ベンジル]-2H-フタラジン-1-オン(2)の合成
IC50値(酵素活性の50%が阻害される濃度)を計算した。IC50値は異なる濃度の範囲、通常は10μM〜0.001μMにわたって求められる。かかるIC50値を、化合物の効力が増加したことを確認するための比較値として用いる。
PARPの小分子阻害剤:
化合物(4)をDMSOに10mMで溶解し、暗所に-20℃で保存した。
VC8細胞およびマウスBrca2 BACが補充された誘導体は、M. Kraakman-van der Zwet, et al., Mol Cell Biol 22, 669-79 (2002))に記載されている。Brca2機能を欠いたES細胞は以前に記述されている(Tutt, et al., EMBO Rep 3, 255-60 (2002))。Brca1機能を欠いたES細胞の構築は他の場所に記載するつもりであるが、以前に確認されている(Foray, et al., Embo J, 22, 2860-71 (2003))。
PARP阻害剤(化合物4)に対する細胞の感受性を測定するために、指数増殖にある細胞培養物をトリプシン処理し、6ウェルプレート中のマイトマイシンC不活化マウス胚性繊維芽細胞上に様々な密度で蒔き、18時間後に試験化合物で適宜処理した。連続暴露の場合には、4日ごとに新しい培地および阻害剤を細胞に補充した。10〜14日後に細胞をPBSで洗浄し、メタノール中に固定し、クリスタルバイオレットで染色した。約50個を超える細胞を含むコロニーをカウントした。実験を3つ組で少なくとも3回実施した。
BRCA1およびBRCA2を欠く細胞の生存度の低下
化合物4を使用して、Brca1またはBrca2を欠く細胞のPARP活性阻害に対する感受性を調べた。クローン原性アッセイによれば、Brca1とBrca2の両方を欠く細胞系は、化合物4に対する感受性が、その他の点では同質遺伝子的な細胞よりも極めて高かった(図1A、1B)。Brca1を欠く細胞では化合物4のSF50(細胞の50%が生存する投与量)は1.5×10-8Mであったのに対して、対応する野生型細胞のSF50は7×10-6Mであった(図1A)。これは、Brca1突然変異細胞の感受性が野生型細胞よりも467倍増加したことを示している。
Claims (1)
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