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Nickel-catalyzed Carbon-carbon Bond-forming Reactions of Unactivated Tertiary Alkyl Halides: Suzuki Arylations

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Journal J Am Chem Soc
Specialty Chemistry
Date 2013 Jan 4
PMID 23281960
Citations 62
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Abstract

The first Suzuki cross-couplings of unactivated tertiary alkyl electrophiles are described. The method employs a readily accessible catalyst (NiBr(2)·diglyme/4,4'-di-tert-butyl-2,2'-bipyridine, both commercially available) and represents the initial example of the use of a group 10 catalyst to cross-couple unactivated tertiary electrophiles to form C-C bonds. This approach to the synthesis of all-carbon quaternary carbon centers does not suffer from isomerization of the alkyl group, in contrast with the umpolung strategy for this bond construction (cross-coupling of a tertiary alkylmetal with an aryl electrophile). Preliminary mechanistic studies are consistent with the generation of a radical intermediate along the reaction pathway.

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