Benzocyclobutadienes: An Unusual Mode of Access Reveals Unusual Modes of Reactivity.

Benzocyclobutadienes: An Unusual Mode of Access Reveals Unusual Modes of Reactivity.
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DOI:
10.1002/anie.201803872
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发表时间:
2018-07-26
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Hoye TR
Hoye TR
中科院分区:
其他
文献类型:
--
作者:
Xiao X;Woods BP;Xiu W;Hoye TR

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芳炔与炔反应生成苯并环丁二烯(BCB)中间体的情况很少。我们在这里报告的例子,这种反应,揭示了由Diels-Alder捕获的BCB的悬挂或外部,缺电子的炔。DFT计算支持的反应过程的机制描绘。一个三组分的过程加入一个苯炔,首先,与富电子,然后,一个贫电子的炔被发现。报道了BCB在Diels-Alder反应中作为4π二烯组分的罕见作用。这些结果也为用于生成苯炔的六脱氢-Diels-桤木反应提供了新的线索。苯并环丁二烯(BCB)是通过苯炔和炔的[2+2]环加成反应得到的。通过这种方法产生的BCB表现出罕见的反应活性,即作为Diels-Alder反应中的4π组分,以提供作为产物的高度取代的聚芳族化合物。DFT计算揭示了这个级联过程的许多机理细节。
The reaction of an aryne with an alkyne to generate a benzocyclobutadiene (BCB) intermediate is rare. We report here examples of this reaction, revealed by Diels-Alder trapping of the BCB by either pendant or external, electron-deficient alkynes. Mechanistic delineation of the reaction course is supported by DFT calculations. A three-component process joining a benzyne, first, with an electron-rich and, then, an electron-poor alkyne was uncovered. Reactions in which the BCB functions in a rarely observed role as a 4π diene component in Diels-Alder reactions are reported. The results also shed new light on aspects of the hexadehydro-Diels-Alder reaction used to generate the benzynes. Benzocyclobutadiene (BCB) has been accessed via a [2+2] cycloaddition of a benzyne and an alkyne. The BCB generated by this method exhibited rare reactivity—namely, as a 4π component in a Diels–Alder reaction to furnish highly substituted polyaromatic compounds as the product. DFT calculations revealed many mechanistic details of this cascade process.
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