Light-Driven Intermolecular Charge Transfer Induced Reactivity of Ethynylbenziodoxol(on)e and Phenols.

Light-Driven Intermolecular Charge Transfer Induced Reactivity of Ethynylbenziodoxol(on)e and Phenols.
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光驱动的分子间电荷转移诱导乙醇乙醇(ON)E和苯酚的反应性。

DOI:
10.1021/jacs.8b05870
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发表时间:
2018-10-10
影响因子:
15
通讯作者:
Miyake GM
Miyake GM
中科院分区:
化学1区
文献类型:
--
作者:
Liu B;Lim CH;Miyake GM

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乙炔基苯碘酰(酮)作为亲电子炔转移试剂广泛应用于有机合成中,涉及碳原子和杂原子亲核试剂。然而,EBX与苯酚的潜在反应仍未得到研究。在这里,我们提出了形成(Z)-2-碘乙烯基苯基醚具有良好的区域和立体选择性,通过EBX和苯酚之间的反应性由可见光驱动。我们提出,这种光激活的转化通过电子供体-受体复合物进行,使新的反应性超越现有的碳和杂原子为基础的亲核试剂的炔基化机制。该操作稳健的方法用于通过在室温下用市售蓝色LED照射含有苯基-EBX、苯酚和碱Cs2 CO 3的溶液来合成不同的(Z)-2-碘乙烯基苯基醚。(Z)-2-碘代乙烯基苯基醚产物可以进一步立体特异性官能化以形成三取代烯烃,证明了这些产物在化学复杂性途径中的潜力。
Ethynylbenziodoxol(on)es (EBXs) have been widely used in organic synthesis as electrophilic alkyne-transfer reagents involving carbon- and heteroatom-based nucleophiles. However, potential reactions of EBXs with phenols remain uninvestigated. Here, we present the formation of (Z)-2-iodovinyl phenyl ethers with excellent regio- and stereoselectivity through the reactivity between EBXs and phenols driven by visible light. We propose that this light-activated transformation proceeds through electron donor−acceptor complexes to enable new reactivity beyond existing mechanisms for alkynylation of carbon- and heteroatom-based nucleophiles. This operationally robust process was employed for the synthesis of diverse (Z)-2-iodovinyl phenyl ethers through irradiating a solution containing a phenyl-EBX, a phenol, and the base Cs2CO3 with a commercially available blue LED at room temperature. The (Z)-2-iodovinyl phenyl ether products can be further stereospecifically functionalized to form trisubstituted alkenes, demonstrating the potential of these products en route to chemical complexity.
通过低能屏障协同机制实现了具有高价值碘试剂的硫醇的快速,高度化学选择性的藻类化。
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