Synthetic and Mechanistic Investigation of an Oxime Ether Electrocyclization Approach to Heteroaromatic Boronic Acid Derivatives.

Synthetic and Mechanistic Investigation of an Oxime Ether Electrocyclization Approach to Heteroaromatic Boronic Acid Derivatives.
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杂芳族硼酸衍生物的肟醚电环化方法的合成和机理研究。

DOI:
10.1002/chem.201802350
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发表时间:
2018
期刊:
Chemistry (Weinheim an der Bergstrasse, Germany)
影响因子:
--
通讯作者:
Mora-Radó H
Mora-Radó H
中科院分区:
--
文献类型:
--
作者:
Mora-Radó H

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通过二硼化/6π-电环化序列容易地获得一系列官能化的杂芳族硼酸衍生物。该研究揭示了令人惊讶的观察结果,即肟醚立体化学和对电环化的反应性之间存在直接关系。具体地,发现E-肟醚比它们的Z-对应物(相对于氮杂三烯支架的立体化学)具有显著更高的反应性。相反,氮杂三烯烯烃末端的构型对反应速率几乎没有影响。计算分析为这一观察提供了理论依据; Nlone pair→C=C π* 轨道相互作用降低了E-肟醚电环化中过渡态的能量。最后,未反应的Z-肟醚可以通过光解促进的E → Z异构化和电环化序列转化为相应的杂环产物。
A range of functionalized heteroaromatic boronic acid derivatives are readily accessed by a diboration/6π‐electrocyclization sequence. This study revealed the surprising observation that there is a direct relationship between oxime ether stereochemistry and reactivity towards electrocyclization. Specifically,E‐oxime ethers are found to be significantly more reactive than theirZ‐counterparts (stereochemistry relative to azatriene scaffold). In contrast, the configuration at the azatriene alkene terminus has little impact on reaction rates. Computational analysis offers a rationale for this observation; a Nlone pair→C=C π* orbital interaction lowers the energy of the transition state in the electrocyclization ofE‐oxime ethers. Finally, unreactiveZ‐oxime ethers can be converted to the corresponding heterocyclic products by a photolytically promotedE→Zisomerization and electrocyclization sequence.
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