JP2022512406A - 二量体ペプチド-リン脂質コンジュゲートのための最適化された方法 - Google Patents
二量体ペプチド-リン脂質コンジュゲートのための最適化された方法 Download PDFInfo
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Abstract
Description
または薬学的に許容できるその塩の調製方法であり、
(i)対応するスクシンイミジルエステル中間体(II)
を、DSPE-PEG2000-NH2リン脂質(III)
と、DIEAの存在下でカップリングするステップを含み、
ここで、前記リン脂質(III)は、化合物(II)に対して過剰に存在する。
(ii)ステップ(i)の反応混合物から回収される粗生成物(I)を単離するステップ;
(iii)ステップ(ii)で得られる粗生成物を水で希釈してもよく、そして、pH6~8に到達するまで塩基を添加するステップ;および
(iv)ステップ(iii)の溶液から粗生成物を精製するステップ、をさらに含む前記方法を提供する。
スキーム2
本明細書において、別段の提供がない限り、以下の用語は以下の意味を有することが意図される。
本明細書中に記載の方法は、上記に定義された式(I)の化合物の調製に関し、高収率かつ最適な純度で最終生成物を提供しながら、高価な出発原料の量を節約する利点を有する。
本発明によれば、実験部分により詳細に記載されるように、式(II)の化合物は、DMF中に溶解された過剰量のDSPE-PEG2000-NH2(III)とともにDIEAのような塩基の存在下でインキュベートされる。ヘテロ二量体前駆体(II)の当量とリン脂質(III)の当量との間の比は少なくとも1:1.1であるが、より好適には1:1.1~1:5である。好ましくは、1:2である。
粗生成物は、反応混合物の濃縮後に回収することができる。例えば、過剰試薬の部分は、適切な溶媒を用いた粗乾燥物の洗浄および混合物の遠心分離によって除去され得る。あるいは、酢酸エチルのような溶媒を添加して最終生成物の沈殿を促進することができ、それから、濾過および乾燥によって単離することができる。
本発明によれば、粗生成物は、RP-HPLCによって、イオン交換クロマトグラフィーによって、または両方の技術によって精製される。
材料および装置
DMFおよび酢酸エチルのような溶媒は、周囲空気に対する曝露時間を最小限にするために、常に適切に使用し乾燥させた。
ペグ化リン脂質とのコンジュゲートの前に、ヘテロ二量体(IV)を、結合剤としてのグルタル酸ジ(N-スクシンイミジル)部分とのカップリングによって活性化した。
カラム:Phenomenex Luna 5μ C18(250×4.6mm)
溶離液A:H2O中10mM AcONH4
溶離液B:H2O/ACN(1/9)中10mM AcONH4
流速:1.5mL/分
検出器:UV214nm
勾配:25%から52%までの移動相A
保持時間:12.69分
実施例1において得られた化合物(II)を単離して、過剰のDSGを反応混合物から除去した。懸濁液を減圧下で濃縮してDMFを除去した。粗乾燥物を10mLのEtOAcで洗浄して、それから、2500gで3分遠心分離した。上清を100mL丸底フラスコ内に静かに移し、固形物を15mLのEtOAcで2回洗浄して、減圧下で乾燥させて47.02mgの白色粉末を得た。
化合物(I)の合成を、スキーム1において報告したステップに従って行なった。UV検出器(220nm)またはELSD検出器を具備する分析的逆相HPLCまたはUPLCを用いて反応の進行を追った。
DSPE-PEG2000-NH2アンモニウム塩のサンプル(18μmol、50.23mg、2eq.)を、300μLの無水DMF中に溶解させて、それから、DIEAを添加して(2eq.)、315μLの合計容量に到達させた。
最終粗生成物(I)の予備HPLC精製を、カップリング反応の分析的監視と同じ固定相を用いて行なった。したがって、Kromasil 10μ 300Å C4カラム(250×10mm)を、水:アセトニトリル(1:9)の混合物中10mM AcONH4を用いて平衡化した後に、サンプルを3アリコート(3×3mL)に分けてローディングした。詳細には、精製に適用した液相および溶出条件を以下に報告する:
微量のDSPE-PEG2000-NH2が存在する場合に粗生成物(I)をさらに精製するために、イオン交換クロマトグラフィー方法を最適化した。
-固定ステップについては:0.05M Tris・HCl-0.10M NaCl-pH7.5+35% iPrOH
-溶出ステップについては:0.05M Tris・HCl-1.00M NaCl-pH7.5+35% iPrOH
-脱塩ステップについては:0.02M Tris・HCl pH7.5
Claims (12)
- 請求項1に記載の方法であって、
前記カップリングは、化合物(II)の当量あたり1.1当量以上のリン脂質(III)で行われる、
方法。 - 請求項1または2に記載の方法であって、
前記カップリングは、化合物(II)の当量あたり2当量のリン脂質(III)で行われる、
方法。 - 請求項1に記載の方法であって、
(ii)ステップ(i)の反応混合物から回収される粗生成物(I)を単離するステップ;
(iii)ステップ(ii)で得られる粗生成物を水で希釈してもよく、そして、pH6~8に到達するまで塩基を添加するステップ;および
(iv)ステップ(iii)の溶液から粗生成物を精製するステップ、
をさらに含む、
方法。 - 請求項4に記載の方法であって、
ステップ(iii)の溶液は、pH7.0~7.5にされる、
方法。 - 請求項4に記載の方法であって、
ステップ(iv)の精製は、逆相高速液体クロマトグラフィー(RP-HPLC)によって行われる、
方法。 - 請求項4に記載の方法であって、
ステップ(iv)の精製は、イオン交換クロマトグラフィーによって行われる、
方法。 - 請求項4に記載の方法であって、
ステップ(iv)の精製は、逆相高速液体クロマトグラフィー(RP-HPLC)およびイオン交換クロマトグラフィーの両方によって行われる、
方法。 - 請求項6または8に記載の方法であって、
RP-HPLC精製は、AcONH4塩を含む移動相を用いて行われる、
方法。 - 請求項7または8に記載の方法であって、
イオン交換クロマトグラフィーは、弱陰イオン交換樹脂およびpH7~8の緩衝液を用いて行われる、
方法。 - 請求項10に記載の方法であって、
溶出溶液は、バッファー0.05M Tris・HCl+1.00M NaCl+35% iPrOHである、
方法。
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