Site-Selective Acylations with Tailor-Made Catalysts.

Site-Selective Acylations with Tailor-Made Catalysts.
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DOI:
10.1002/chem.201600790
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发表时间:
2016-04-18
影响因子:
4.3
通讯作者:
Kirsch, Stefan F.
Kirsch, Stefan F.
中科院分区:
化学2区
文献类型:
--
作者:
Huber, Florian;Kirsch, Stefan F.

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由N,N -二甲氨基吡啶(DMAP)催化的醇的酰化反应,尽管被广泛使用,但有时会遇到底物特异性问题:例如,具有多个羟基的目标化合物可能对一个羟基表现出不足的选择性,并且所产生的产物混合物很难分离。在这里,我们描述了一个概念,旨在为特定位点的酰化定制催化剂。为此,我们介绍了一个催化剂库,其中每个条目都是通过连接一个可变的、容易调整的肽支架和一个基于DMAP的催化活性单元来构建的。对于选定的例子,我们展示了文库筛选如何导致优化催化剂的鉴定,并且与仅DMAP相比,感兴趣的底物可以以显着增强的位点选择性进行转化。此外,这种类型的底物优化催化剂可用于在结构相似的化合物存在下选择性地转化“它们的”底物,这是与物质混合物反应的重要条件。
The acylation of alcohols catalyzed by N,N‐dimethylamino pyridine (DMAP) is, despite its widespread use, sometimes confronted with substrate‐specific problems: For example, target compounds with multiple hydroxy groups may show insufficient selectivity for one hydroxyl, and the resulting product mixtures are hardly separable. Here we describe a concept that aims at tailor‐made catalysts for the site‐specific acylation. To this end, we introduce a catalyst library where each entry is constructed by connecting a variable and readily tuned peptide scaffold with a catalytically active unit based on DMAP. For selected examples, we demonstrate how library screening leads to the identification of optimized catalysts, and the substrates of interest can be converted with a markedly enhanced site‐selectivity compared with only DMAP. Furthermore, substrate‐optimized catalysts of this type can be used to selectively convert “their” substrate in the presence of structurally similar compounds, an important requisite for reactions with mixtures of substances.
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