N-Heterocyclic carbene based catalytic platform for Hauser-Kraus annulations.
N-Heterocyclic carbene based catalytic platform for Hauser-Kraus annulations.
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DOI:
10.1039/d0sc03116j
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发表时间:
2020-06-30
期刊:
影响因子:
8.4
通讯作者:
Tambar UK
中科院分区:
文献类型:
--
作者:
Sharique M;Tambar UK
The venerable Hauser–Kraus annulation is an effective and convergent method for generating oxygenated polycyclic aromatic compounds. Despite its application in complex molecule synthesis, the harsh and strongly basic conditions can limit its utility in more functionalized molecular settings. We have developed the first catalytic Hauser–Kraus annulation based on N-heterocyclic carbene catalysis that proceeds under milder conditions. We demonstrate the scope of the transformation in the presence of several functional groups. We also propose a concerted mechanism for the annulation that proceeds through a non-canonical Breslow intermediate. The venerable Hauser–Kraus annulation is an effective and convergent method for generating oxygenated polycyclic aromatic compounds. A catalytic Hauser–Kraus annulation has been developed based on N-heterocyclic carbene catalysis.
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