Catalytic enantioselective cross-couplings of secondary alkyl electrophiles with secondary alkylmetal nucleophiles: Negishi reactions of racemic benzylic bromides with achiral alkylzinc reagents.

Catalytic enantioselective cross-couplings of secondary alkyl electrophiles with secondary alkylmetal nucleophiles: Negishi reactions of racemic benzylic bromides with achiral alkylzinc reagents.
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二级烷基亲电的催化对映选择性交叉偶联与继发烷基金属亲核:二氧化苯二溴溴与急性烷基试剂的Negishi反应。

DOI:
10.1021/ja308460z
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发表时间:
2012-10-17
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:
Binder, Jorg T.;Cordier, Christopher J.;Fu, Gregory C.

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我们已经开发了一种镍催化的方法,用于二级亲电试剂与二级亲核试剂的不对称交叉偶联,特别是外消旋苄基溴与非手性环烷基锌试剂的立体会聚Negishi反应。与大多数先前的对映选择性根岸交叉偶联的研究相反,三齿pybox配体在该过程中是无效的;然而,一种新的、容易获得的二齿异喹啉-恶唑啉配体具有优异的ee和良好的产率。使用无环烷基锌试剂作为偶联伙伴导致发现了一种非常不寻常的异构化,该异构化产生了大量的支链交叉偶联产物,来自无支链亲核试剂。
We have developed a nickel-catalyzed method for the asymmetric cross-coupling of secondary electrophiles with secondary nucleophiles, specifically, stereoconvergent Negishi reactions of racemic benzylic bromides with achiral cycloalkylzinc reagents. In contrast to most previous studies of enantioselective Negishi cross-couplings, tridentate pybox ligands are ineffective in this process; however, a new, readily available bidentate isoquinoline-oxazoline ligand furnishes excellent ee's and good yields. The use of acyclic alkylzinc reagents as coupling partners led to the discovery of a highly unusual isomerization that generates a significant quantity of a branched cross-coupling product from an unbranched nucleophile.
镍催化带有氧离去基团的外消旋二级亲电子试剂的对映选择性交叉偶联。
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