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Nat. Chem. | 中山/南京中医药/南大/湖南大学等 | 三元环“变形记”:硫杂桥环打造更优药物骨架,破解苯环替代难题!

  • 2026-04-21 13:00:08
Nat. Chem. | 中山/南京中医药/南大/湖南大学等 | 三元环“变形记”:硫杂桥环打造更优药物骨架,破解苯环替代难题!

三元环“变形记”:硫杂桥环打造更优药物骨架,破解苯环替代难题!

你有没有想过,我们每天服用的药片里,藏着一个“平面陷阱”?

现代药物中,超过60%的小分子都含有苯环——那个六边形的芳香结构,像一张扁平的纸片,牢牢嵌在分子核心。但正是这种“过于平坦”的结构,常常让药物在体内难溶、代谢快,甚至产生副作用。

于是,药物化学家们喊出了“逃离平面世界”(Escape from Flatland)的口号——用三维立体、富含sp³碳的“笼状”结构,去替代那些扁平的苯环。这就像把一张纸折成立体纸鹤,不仅形状变了,功能也可能焕然一新。

然而,一个关键难题长期困扰着科学家:1,2,4-三取代苯环——这是药物中第二常见的苯环模式(比如止痛药双氯芬酸、抗癌药索尼德吉布都含此结构),却始终找不到理想的三维替代品。

直到今天,来自中山大学钱宇教授、南京中医药大学张薇副教授、南京大学王国强副教授和湖南大学冯见君教授等联合团队,在《Nature Chemistry》上发表了一项突破性成果:他们用一种叫“双环[1.1.0]丁烷”(BCB)的小分子,像乐高积木一样,与廉价的1,4-二硫杂环己烷-2,5-二醇发生巧妙的“(3+3)环加成”反应,高效构建出一类全新的三维骨架——2-硫杂双环[3.1.1]庚烷(thia-BCHeps)。

图1:从对位苯环(左)到邻位、间位乃至1,2,4-三取代苯环(右下角问号区域)的三维替代策略。此前,1,2,4-三取代苯的替代品几乎空白。

这个新骨架有多神奇?

首先,它精准匹配!通过X射线晶体学和计算模拟,团队发现:

  • 带两个取代基的thia-BCHep,其键角和距离完美复刻邻位取代苯环
  • 带三个取代基的版本,则能精确模拟1,2,4-三取代苯环的空间构型。

图5a:左图为邻位苯 vs. 4,5-二取代thia-BCHep;中图为间位苯 vs. 1,5-二取代硫杂双环庚烯;右图为1,2,4-三取代苯 vs. 1,4,5-三取代thia-BCHep。空间走向高度一致!图5c:(S)-34(红色柱)对PGE₂的抑制率显著高于原药双氯芬酸(diflunisal)!

更妙的是,硫原子(S)。论文指出,约25%的上市小分子药物含硫。硫不仅能形成独特的非共价相互作用(如S···O、S···π),还能像“旋钮”一样调节分子性质——只需简单氧化,就能把硫醚(-S-)变成亚砜(-SO-)或砜(-SO₂-),从而大幅提升水溶性、降低脂溶性。

实验数据令人振奋:

  • 将双氯芬酸中的苯环换成thia-BCHep,(S)-构型的类似物抑制炎症因子PGE₂的能力甚至优于原药
  • 在抗骨质疏松先导化合物中,引入砜基后,代谢稳定性提升10倍(半衰期从7.6分钟增至74分钟)!
  • 抗癌药索尼德吉布的三维类似物,对乳腺癌、肺癌、胰腺癌细胞的杀伤力显著增强,且动物实验显示毒性可控。

这项技术还实现了克级放大手性控制——通过手性催化剂,能分别合成出高纯度的(R)或(S)构型产物。要知道,不同手性的药物,效果可能天差地别(比如沙利度胺悲剧)。团队开发的两种催化体系,让精准定制成为可能。

可以说,thia-BCHep不仅是一个新骨架,更是一个可编程的药物设计平台

  • 两个“出口向量” → 模拟邻位苯;
  • 三个“出口向量” → 模拟1,2,4-三取代苯;
  • 脱水后得双环庚烯 → 模拟间位苯;
  • 硫氧化态调节 → 精细调控溶解性、代谢性;
  • 手性中心 → 优化靶向性和安全性。

这为药物研发打开了一扇新窗——未来,或许会有更多“逃离平面”的明星药物,从这个小小的硫杂桥环中诞生。

你怎么看? 如果让你设计一款新药,你会愿意用这种三维“变形金刚”替代传统苯环吗?欢迎在评论区聊聊你的想法!觉得这篇文章有启发,别忘了点赞、分享给更多朋友~


参考文献

Feng Wu et al. Collective synthesis of 1,2,4-trisubstituted, meta- and ortho-substituted arene bioisosteres from bicyclobutanes. Nature Chemistry (2026). https://doi.org/10.1038/s41557-026-02097-7


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#药物设计#苯环替代#三维骨架#硫杂双环#生物电子等排体

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  1. CONNECT:[ UseTime:0.000681s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001127s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000435s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000476s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000982s ]
  6. SELECT * FROM `set` [ RunTime:0.000450s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001183s ]
  8. SELECT * FROM `article` WHERE `id` = 497570 LIMIT 1 [ RunTime:0.000917s ]
  9. UPDATE `article` SET `lasttime` = 1776829988 WHERE `id` = 497570 [ RunTime:0.001141s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000446s ]
  11. SELECT * FROM `article` WHERE `id` < 497570 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000916s ]
  12. SELECT * FROM `article` WHERE `id` > 497570 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000726s ]
  13. SELECT * FROM `article` WHERE `id` < 497570 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001678s ]
  14. SELECT * FROM `article` WHERE `id` < 497570 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001607s ]
  15. SELECT * FROM `article` WHERE `id` < 497570 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001816s ]
0.129892s