Inverse electron demand Diels-Alder reactions of 1,2,3-triazines: pronounced substituent effects on reactivity and cycloaddition scope.

Inverse electron demand Diels-Alder reactions of 1,2,3-triazines: pronounced substituent effects on reactivity and cycloaddition scope.
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DOI:
10.1021/ja204856a
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发表时间:
2011-08-10
影响因子:
15
通讯作者:
Boger DL
Boger DL
中科院分区:
化学1区
文献类型:
--
作者:
Anderson ED;Boger DL

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公开了1,2,3-三嗪的反电子需求Diels-Alder反应的系统研究,包括C5取代基的影响的检查。发现这样的取代基对1,2,3-三嗪的环加成反应性表现出显著的影响,而不改变,甚至可能增强,固有的环加成区域选择性。该研究表明,不仅可以通过C5取代基(R = CO2 Me> Ph > H)可预测地调节反应性,而且该影响是将1,2,3-三嗪(1)及其适度的环加成范围转化为杂环氮杂二烯体系的量级,该反应范围预示着广泛的合成效用,扩大了参与的亲二烯体的范围。值得注意的是,这些研究定义了一种现在强大的额外的杂环氮杂二烯,与异构体1,2,4-三嗪和1,3,5-三嗪互补,能够可靠地参与反电子需求狄尔斯-阿尔德反应,扩大了实施该方法可获得的互补杂环系统的数量。
A systematic study of the inverse electron demand Diels–Alder reactions of 1,2,3-triazines is disclosed, including an examination of the impact of a C5 substituent. Such substituents were found to exhibit a remarkable impact on the cycloaddition reactivity of the 1,2,3-triazine without altering, and perhaps even enhancing, the intrinsic cycloaddition regioselectivity. The study revealed that not only may the reactivity be predictably modulated by a C5 substituent (R = CO2Me > Ph > H), but that the impact is of a magnitude to convert 1,2,3-triazine (1) and its modest cycloaddition scope into a heterocyclic azadiene system with a reaction scope that portends extensive synthetic utility, expanding the range of participating dienophiles. Significantly, the studies define a now powerful additional heterocyclic azadiene, complementary to the isomeric 1,2,4-triazines and 1,3,5-triazines, capable of dependable participation in inverse electron demand Diels–Alder reactions, extending the number of complementary heterocyclic ring systems accessible with implementation of the methodology.
DOI: 10.1021/ja8053805
发表时间: 2008-10-15
影响因子: 15
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发表时间: 1991-11-22
影响因子: 3.6
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