New ansamitocin derivatives bearing a linking group are disclosed. Also disclosed are methods for the synthesis of these new ansamitocin derivatives and methods for their linkage to cell-binding agents. The ansamitocin derivative-cell-binding agent conjugates are useful as therapeutic agents, which are delivered specifically to target cells and are cytotoxic. These conjugates display vastly improved therapeutic efficacy in animal tumor models compared to the previously described agents.
本文披露了一种新的含有连接基团的ansamitocin衍
生物。同时,还披露了合成这些新的ansamitocin衍
生物以及将它们连接到细胞结合剂的方法。这些ansamitocin衍
生物-细胞结合剂共轭物作为治疗剂具有特异性地传递到目标细胞并具有细胞毒性的特点。与以前描述的治疗剂相比,这些共轭物在动物肿瘤模型中表现出极大的治疗效果。