抑制合成中的α-碳种族化,这种抑制是基于一种醇-性氨基保护群的
Yifei Zhou1, Hongjun Li1, Yi Huang1
1State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, Department of Chemical Biology, College of Chemistry, Nankai University, Tianjin, 300071, China.
一个新的醇可变的保护组,2,4-dinitro-6-phenyl-benzene sulfenyl (DNPBS),可以最大限度地减少固相合成 (SPPS) 中的副作用. 当与标准的Fmoc化学相结合时,DNPBS为复杂合成提供了一个正交的策略.
科学领域:
- 有机化学 有机化学
- 生物化学 生物化学
- 合成化学 合成化学
背景情况:
- 传统的固相合成 (SPPS) 使用基基保护组,如9-基甲基基 (Fmoc),用于α-氨基基组.
- 标准的SPPS方法容易产生副作用,包括α-C种族化和阿斯巴提胺的形成,导致难以去除的副产品.
- 这些副作用会损害的纯度,并使净化过程复杂化.
研究的目的:
- 为增强固相合成引入一种新型的醇性氨基保护组.
- 评估2,4-dinitro-6-phenyl-benzene sulfenyl (DNPBS) 组在抑制常见的SPPS副作用方面的疗效.
- 探索DNPBS作为一个直角保护组的潜力,与现有的SPPS策略相结合.
主要方法:
- 在SPPS中开发和应用2,4-dinitro-6-phenyl-benzene sulfenyl (DNPBS) 保护组,用于α-氨基基组.
- 在温和的,几乎中性的条件下,使用p-toluenethiol在pyridine中的DNPBS组的定量去除.
- 对DNPBS介导的SPPS与基于Fmoc的传统SPPS进行比较分析,重点是抑制副作用反应和合成效率.
主要成果:
- 在温和条件下 (1M p-toluenethiol/pyridine),通过S-N键连接的DNPBS组可以在几分钟内进行定量裂变.
- 使用DNPBS显著抑制了常规SPPS中常见的α-C种族化和阿斯巴提胺形成等主要副作用.
- 虽然DNPBS SPPS与Fmoc SPPS相比,对长的效率较低,但它的正交性允许组合使用.
结论:
- DNPBS组代表了固相合成的有价值的新工具,为副作用提供了更好的控制.
- DNPBS和Fmoc保护群的直角性使得具有挑战性的的合成成为可能,这些很难用标准方法获得.
- 结合DNPBS和Fmoc SPPS策略,为构建具有更高纯度的复杂序列开辟了新的途径.
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