Regioselective Diels-Alder cycloadditions and other reactions of 4,5-, 5,6-, and 6,7-indole arynes.

Regioselective Diels-Alder cycloadditions and other reactions of 4,5-, 5,6-, and 6,7-indole arynes.
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DOI:
10.1016/j.tetlet.2008.10.086
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发表时间:
2009-01-07
影响因子:
1.8
通讯作者:
Buszek, Keith R.
Buszek, Keith R.
中科院分区:
化学4区
文献类型:
--
作者:
Brown, Neil;Luo, Diheng;Velde, David Vander;Yang, Shaorong;Brassfield, Allen;Buszek, Keith R.

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研究了吲哚芳炔(indolynes)在所有三个苯环位置的Diels-Alder环加成反应的区域选择性。与通过金属-卤素交换从相应的邻-二溴吲哚衍生的4,5-和5,6-吲哚啉的环加成基本上不显示与2-叔丁基呋喃的选择性。相比之下,6,7-吲哚炔表现出几乎完全偏好于空间上更拥挤的环加合物。同样的环加合物经历一个容易的酸催化重排,得到环状烯酮,或者,在空气存在下,经历水解和氧化,得到吲哚苯醌。5,6-二氟吲哚表现出反常行为,在乙醚中与n-BuLi反应生成5-氟-6,7-吲哚啉,在甲苯中与n-BuLi反应生成5,6-吲哚啉。我们还证明,苯型吲哚可以很容易地和方便地生成的邻三甲基甲硅烷基三氟甲磺酸酯的氟化物诱导的分解。
The regioselectivity of Diels-Alder cycloadditions of indole arynes (indolynes) at all three benzenoid positions was examined. Cycloadditions with the 4,5-and 5,6-indolynes, derived via metal-halogen exchange from the corresponding o-dibromo indoles, showed essentially no selectivity with 2-t-butylfuran. In contrast, the 6,7-indolyne displayed virtually complete preference for the more sterically congested cycloadduct. This same cycloadduct undergoes a facile acid-catalyzed rearrangement to afford the annulated enone, or alternatively, undergoes hydrolysis and oxidation in the presence of air to give the indolobenzoquinone. The 5,6-difluoroindoles show anomolous behavior and give either 5-fluoro-6,7-indolynes with n-BuLi in ether, or 5,6-indolynes with n-BuLi in toluene. We have also demonstrated that benzenoid indolynes can be easily and conveniently generated by the fluoride-induced decomposition of o-trimethylsilyl triflates.
DOI: 10.1002/cber.19580910714
发表时间: 1958-01-01
期刊: CHEMISCHE BERICHTE-RECUEIL
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发表时间: 1988-01-01
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