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
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--
通讯作者:
Mora-Radó H
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文献类型:
--
作者:
Mora-Radó H
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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发表时间:
1996
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作者:
A. R. Sherman
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A. R. Sherman
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1996
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1973
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C. Spangler;Thor P. Jondahl;B. Spangler
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1972
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作者:
A. Padwa;F. Albrecht
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3.2
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