Synthesis of Cycloheptatrienes, Oxepines, Thiepines, and Silepines: A Comparison between Brønsted Acid and Au‐Catalysis

Synthesis of Cycloheptatrienes, Oxepines, Thiepines, and Silepines: A Comparison between Brønsted Acid and Au‐Catalysis
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环庚三烯、Oxepines、Thiepines 和 Silepines 的合成:布伦斯台德酸和 Auâ 催化的比较

DOI:
10.1002/ejoc.202001072
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发表时间:
2020
影响因子:
2.8
通讯作者:
M. Alcarazo
M. Alcarazo
中科院分区:
化学3区
文献类型:
--
作者:
K. Sprenger;C. Golz;M. Alcarazo

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本文报道了1-(苄基-、氧芳基-、硫芳基-和硅杂芳基)-2-乙炔基苯在Brønsted酸-和Au(I)-催化下的环化反应。布朗斯台德酸催化无一例外地有利于形成由炔的区域选择性质子化衍生的产物,以产生最稳定的乙烯基碳阳离子中间体。这决定了该初始步骤之后的环化类型,因此决定了产物的结构。通常,除了少数例外,例如,当底物含有末端炔部分时,Au-催化优先促进通过7-endo-dig环化形成七元环。这种反应途径是强加的,即使先验的基板中的自然电子极化将建议另一种操作机制。利用这些反应模式,以优异的产率和区域选择性合成了一系列结构不同的二苯并环庚三烯、-氧杂卓、-硫杂卓和-西莱平。
The cyclization of 1‐(benzyl‐, oxyaryl‐, thioaryl‐, and silaaryl)‐2‐ethynylbenzenes under Brønsted acid‐ and Au(I)‐catalysis is described. Brønsted acid catalysis favors without exception the formation of the products derived from the regioselective protonation of the alkyne to generate the most stable vinyl carbocation intermediate. This determines the type of cyclization following this initial step and therefore, the structure of the products. Contrarily, with only a few exceptions, for example, when the substrate contains a terminal alkyne moiety, Au‐catalysis preferentially promotes the formation of seven‐membered rings via 7‐endo‐dig cyclization. This reaction pathway is imposed even if a priori the natural electronic polarization in the substrates would suggest another operating mechanism. Making use of these reactivity patterns, a series of structurally differentiated dibenzo‐cycloheptatrienes, ‐oxepines, ‐thiepines and ‐silepines have been synthesized with excellent yields and regioselectivities.
对映体纯的10,11-二氢二苯并[b,f]噻吩的合成和化学。
DOI: --
发表时间: 2006
影响因子: 3.2
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P. Wyatt;A. Hudson;J. Charmant;A. Orpen;H. Phetmung
通讯作者: H. Phetmung
DOI: 10.1002/chem.201601759
发表时间: 2016
期刊: Chemistry
影响因子: --
作者:
G. Mehler;P. Linowski;J. Carreras;A. Zanardi;J. W. Dube;M. Alcarazo
通讯作者: M. Alcarazo
DOI: 10.1002/anie.201915870
发表时间: 2020-02-20
影响因子: 16.6
作者:
Hartung, Thierry;Machleid, Rafael;Alcarazo, Manuel
通讯作者: Alcarazo, Manuel