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Facilitating the transmetalation step with aryl-zincates in nickel-catalyzed enantioselective arylation of secondary benzylic halides

Weichen Huang, Mei Hu, Xiaolong Wan and Qilong Shen ()
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Weichen Huang: University of Chinese Academy Sciences, Chinese Academy of Sciences
Mei Hu: University of Jinan
Xiaolong Wan: University of Chinese Academy Sciences, Chinese Academy of Sciences
Qilong Shen: University of Chinese Academy Sciences, Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Nickel-catalyzed asymmetric cross-coupling of secondary alkyl electrophiles with different nucleophiles represents a powerful strategy for the construction of chiral tertiary carbon centers. Yet, the use of aryl Grignard reagents or aryl zinc halides in many reactions typically resulted in low enantioselectivity, mainly due to their slow transmetalation step in the catalytical cycle and consequently the requirement of relatively high temperature. Here we report that the use of lithium aryl zincate [Ph2ZnBr]Li facilitates the transmetalation step of the nickel-catalyzed cross-coupling reaction. Based on this discovery, a highly enantioselective construction of fluoroalkyl-substituted stereogenic center by a nickel-catalyzed asymmetric Suzuki-Miyaura coupling of α-bromobenzyl trifluoro-/difluoro-/mono- fluoromethanes with a variety of lithium aryl zincates [Ph2ZnBr]Li that were in situ generated from the reaction of lithium organoboronate with 1.0 equivalent of ZnBr2 was described.

Date: 2019
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DOI: 10.1038/s41467-019-10851-4

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