Design, Synthesis, and Biological Evaluation of a 1α,25-Dihydroxy-19-norvitamin D<sub>3</sub> Analogue with a Frozen A-Ring Conformation
作者:Rafal R. Sicinski、Agnieszka Glebocka、Lori A. Plum、Hector F. DeLuca
DOI:10.1021/jm070635+
日期:2007.11.1
reduced activity compared to the natural hormone 1, but the binding, differentiation, and transcriptional activities of analogue 5 are markedly higher than that of 4 constrained in the alpha-chair conformation. Surprisingly, in vivo tests in mice showed that the analogue 4 significantly increases serum calcium at dose levels similar to 1alpha,25-(OH)2D3. These seemingly discordant results are discussed
为了建立负责生物活性的维生素D化合物的构象,合成了具有沿轴向固定的1α-羟基(β椅子形式)的1alpha,25-二羟基-19-降钙素D类似物4。起始化合物为衍生自奎宁酸内酯的双环内酯6、7a和7b,它们被转化为双环酮13。该化合物与砜15的Julia偶联生成了19-norvitamin D类似物4,具有一个额外的环。连接3beta-氧和C-2,以及异构体3beta-羟基化合物5。在体外,与天然激素1相比,类似物4和5的活性都降低了,但是类似物5的结合,分化和转录活性却很高。明显高于受alpha-chair构象约束的4个。出奇,小鼠体内试验显示,类似物4以与1alpha,25-(OH)2D3相似的剂量水平显着增加血清钙。讨论了这些看似不一致的结果。