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.
中科院分区:
文献类型:
--
作者:
Binder, Jorg T.;Cordier, Christopher J.;Fu, Gregory C.
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.
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