Synthesis and Stability of Four Maleimide Derivatives of the Anticancer Drug Doxorubicin for the Preparation of Chemoimmunoconjugates.
作者:Michael KRUGER、Ulrich BEYER、Peter SCHUMACHER、Clemens UNGER、Heike ZAHN、Felix KARTZ
DOI:10.1248/cpb.45.399
日期:——
By attaching maleimide groups to anticancer drugs, derivatives are obtained which bind selectively to thiolated carrier proteins. Four maleimide derivatives of the anticancer drug doxorubicin were prepared in which 3-maleimidobenzoic acid or 4-maleimidophenylacetic acid was bound to the 3'-amino position of doxorubicin through a benzoyl or phenylacetyl amide bond (1 or 2) or in which 3-maleimidobenzoic acid hydrazide or 4-maleimidophenylacetic acid hydrazide was bound to the 13-keto position through a benzoyl or phenylacetyl hydrazone bond (3 or 4). The maleimide derivatives of doxorubicin were characterized by means of 13C-NMR spectroscopy, elemental analysis and mass spectrometry. In addition, the stability of the maleimide derivatives 1-4 at pH values of 5.0 and 7.4 was investigated with the aid of HPLC. The amide or hydrazone bond of 1-4 is stable at pH 7.4 whereas the hydrazone bond is acid-sensitive.
通过将马来酰亚胺基团连接到抗癌药物上,可以获得选择性地与硫醇载体蛋白结合的衍生物。我们制备了抗癌药物多柔比星的四种马来酰亚胺衍生物,其中 3-马来酰亚胺苯甲酸或 4-马来酰亚胺苯乙酸通过苯甲酰基或苯乙酰基酰胺键(1 或 2)与多柔比星的 3'-氨基位置结合,或者 3-马来酰亚胺苯甲酸酰肼或 4-马来酰亚胺苯乙酸通过苯甲酰基或苯乙酰基酰胺键(1 或 2)与多柔比星的 3'-氨基位置结合。马来酰亚胺苯甲酸酰肼或 4-马来酰亚胺苯乙酸酰肼通过苯甲酰基或苯乙酰基腙键与 13-酮位结合(3 或 4)。多柔比星的马来酰亚胺衍生物通过 13C-NMR 光谱、元素分析和质谱法进行了表征。此外,还借助高效液相色谱法研究了马来酰亚胺衍生物 1-4 在 pH 值为 5.0 和 7.4 时的稳定性。1-4 的酰胺键或腙键在 pH 值为 7.4 时是稳定的,而腙键对酸敏感。