To search for new antiestrogens more effective in treating breast cancers, we explored alternatives to the acrylic acid side chain used in many antiestrogens. To facilitate our search, we used a simple adamantyl ligand core that by avoiding stereochemical issues enabled rapid synthesis of acrylate ketone, ester, and amide analogs. All compounds were high affinity estrogen receptor α (ERα) ligands but displayed a range of efficacies and potencies as antiproliferative and ERα-downregulating agents. There were large differences in activity between compounds having minor structural changes, but antiproliferative and ERα-downregulating efficacies generally paralleled one another. Some compounds with side chain polar groups had particularly high affinities. The secondary carboxamides had the best cellular activities, and the 3-hydroxypropylamide was as efficacious as fulvestrant in suppressing cell proliferation and gene expression. This study has produced structurally novel antiestrogens based on a simple adamantyl core structure with acrylate side chains optimized for cellular antagonist activity.

中文翻译：

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具有新型侧链的金刚烷抗雌激素揭示了抑制乳腺癌细胞中雌激素受体介导的活性的活性谱。

为了寻找在乳腺癌中更有效的新型抗雌激素，我们探索了许多抗雌激素中丙烯酸侧链的替代物。为了方便我们的搜索，我们使用了一个简单的金刚烷基配体核心，该核心通过避免立体化学问题而实现了丙烯酸酯，酯和酰胺类似物的快速合成。所有化合物均为高亲和力雌激素受体α（ERα）配体，但作为抗增殖剂和ERα下调剂表现出一系列功效和功效。具有微小结构变化的化合物之间的活性差异很大，但抗增殖和ERα下调的功效通常相互平行。一些具有侧链极性基团的化合物具有特别高的亲和力。次生羧酰胺具有最佳的细胞活性，3-羟丙基酰胺在抑制细胞增殖和基因表达方面与氟维司群一样有效。这项研究基于简单的金刚烷基核心结构以及针对细胞拮抗剂活性进行了优化的丙烯酸酯侧链，生产出了结构新颖的抗雌激素药。