Nickel/bis(oxazoline)-catalyzed asymmetric Kumada reactions of alkyl electrophiles: cross-couplings of racemic alpha-bromoketones.

Nickel/bis(oxazoline)-catalyzed asymmetric Kumada reactions of alkyl electrophiles: cross-couplings of racemic alpha-bromoketones.
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DOI:
10.1021/ja909689t
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发表时间:
2010-02-03
影响因子:
15
通讯作者:
Fu, Gregory C.
Fu, Gregory C.
中科院分区:
化学1区
文献类型:
--
作者:
Lou, Sha;Fu, Gregory C.

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The first asymmetric Kumada reactions of alkyl electrophiles are described, specifically, cross-couplings of racemic α-bromoketones with aryl Grignard reagents. Several features of this investigation are of interest. First, the couplings proceed at remarkably low temperature (−40 °C or −60 °C), which enables the asymmetric synthesis of racemization-prone α-arylketones. Second, dialkyl ketones undergo enantioselective coupling in good ee and yield. Third, readily available bis(oxazolines) are shown for the first time to be effective ligands for cross-couplings of alkyl electrophiles, thereby opening the door to new opportunities in asymmetric catalysis.
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