cyclization–Suzuki coupling method. The new analogues were assayed against human colon and breast cancer cell lines and in mice. All new vitamin D3 analogues bound less strongly to the VDR than 1α,25-dihydroxyvitamin D3 but had similar antiproliferative, pro-differentiating, and transcriptional activity as the native hormone. In vivo, the three analogues had markedly low calcemic effects.
结构导向的优化用于设计新的1α,25-二羟基
维生素D 3的类似物,其在C12处带有主侧链,在C17处具有较短的第二条羟基化链。新化合物5a – c是从酮9(可以很容易地从Inhoffen–Lythgoe二醇中获得)有效合成的,5a,5b和5c的总收率分别为15%,6%和3%。通过Pd催化串联环化-Suzuki偶联方法引入了
三烯体系。测定了针对人结肠和乳腺癌
细胞系以及小鼠中的新类似物。所有新的
维生素D 3类似物与VDR的结合强度不如1α,25-二羟基
维生素D 3,但具有与天然激素相似的抗增殖,促分化和转录活性。在体内,这三种类似物的
钙化作用明显降低。