Synthesis of 2-Ethyl-19-<i>nor</i>Analogs of 1α,25-Dihydroxyvitamin D<sub>3</sub>
作者:Duchan R. Laplace、Michel Van Overschelde、Pierre J. De Clercq、Annemieke Verstuyf、Johan M. Winne
DOI:10.1002/ejoc.201201261
日期:2013.2
The synthesis of two new A-ring precursors, useful for the convergent assembly of 2α-ethyl and 2β-ethyl derivatives of 19-nor-1α,25-dihydroxyvitamin D3, is described. These building blocks were prepared in 14 steps from quinic acid, which led to a new and practical synthesis of 2α-ethyl-14-epi-19-nor-20-epi-23-yne-1,25(OH)2D3, an analog that shows a remarkably low calcemic effect in mice, while retaining
描述了两种新 A 环前体的合成,可用于 19-nor-1α,25-二羟基维生素 D3 的 2α-乙基和 2β-乙基衍生物的会聚组装。这些结构单元由奎尼酸分 14 个步骤制备,从而实现了 2α-乙基-14-epi-19-nor-20-epi-23-yne-1,25(OH)2D3 的新的实用合成,这种类似物在小鼠中显示出显着的低血钙效应,同时保留了在许多人类癌细胞系中促进细胞分化和抑制细胞增殖的能力。