Asymmetric cooperative catalysis of strong Brønsted acid-promoted reactions using chiral ureas.
Asymmetric cooperative catalysis of strong Brønsted acid-promoted reactions using chiral ureas.
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DOI:
10.1126/science.1182826
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发表时间:
2010-02-19
期刊:
影响因子:
--
通讯作者:
Jacobsen EN
中科院分区:
文献类型:
--
作者:
Xu H;Zuend SJ;Woll MG;Tao Y;Jacobsen EN
Cationic organic intermediates participate in a wide variety of useful synthetic transformations, but their high reactivity can render selectivity in competing pathways difficult to control. We describe a strategy for inducing enantioselectivity in reactions of protio-iminium ions, wherein a chiral catalyst interacts with the highly reactive intermediate through a network of non-covalent interactions. This leads to an attenuation of the reactivity of the iminium ion, and allows high enantioselectivity in cycloadditions with electron-rich alkenes (the Povarov reaction). A detailed experimental and computational analysis of this catalyst system has revealed the precise nature of the catalyst-substrate interactions and the likely basis for enantioinduction.
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影响因子:
15
作者:
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通讯作者:
Terada, M
影响因子:
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作者:
WITHERUP, KM;RANSOM, RW;VARGA, SL
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DOI:
10.1139/v96-063
发表时间:
1996-04-01
期刊:
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
影响因子:
--
作者:
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通讯作者:
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