作者:Agnieszka Glebocka、Rafal R. Sicinski、Lori A. Plum、Hector F. DeLuca
DOI:10.1016/j.jsbmb.2010.03.011
日期:2010.7
us and tested biologically. The geometrical isomer 5 having a fixed 3beta-hydroxy group was also obtained. These compounds were formed in the Julia coupling of the sulfone derived from the Grundmann ketone, and the A-ring fragment prepared in the multi-step synthesis from the (-)-quinic acid. Contrary to its counterpart 5, the analog 4 retained some affinity to vitamin D receptor.
我们最近描述了1alpha,25-dihydroxy-19-norvitamin D3类似物2和3的合成,它们具有连接其3beta氧和C-2的附加环。这样的结构约束阻止了A环构象的柔性,并且类似物仅以其α-羟基固定在轴向位置的α-椅子形式存在。这些类似物与维生素D受体的结合非常差,并且没有转录活性。出乎意料的是,当在大鼠体内进行测试时,与1alpha,25-dihydroxyvitamin D3(1)相比,它们表现出的钙减少反应明显延迟。这种反应可能是由于这些化合物在生物体内的代谢转化(醚裂解)所致。因此,令人感兴趣的是获得和生物学评估具有纯烃性质的附加环的类似化合物。由我们合成并以生物学方法测试了此类1alpha,25-dihydroxy-19-norvitamin D3的类似物4,其特征是存在赤道1alpha-羟基(β椅子形式)。还获得了具有固定的3β-羟基的几何异构体5。这些化合物是