A mild, palladium-catalyzed method for the dehydrohalogenation of alkyl bromides: synthetic and mechanistic studies.
A mild, palladium-catalyzed method for the dehydrohalogenation of alkyl bromides: synthetic and mechanistic studies.
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DOI:
10.1021/ja306323x
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发表时间:
2012-08-29
影响因子:
15
通讯作者:
Fu GC
中科院分区:
文献类型:
--
作者:
Bissember AC;Levina A;Fu GC
We have exploited a typically undesired elementary step in cross-coupling reactions, β-hydride elimination, to accomplish palladium-catalyzed dehydrohalogenations of alkyl bromides to form terminal olefins. We have applied this method, which proceeds in excellent yield at room temperature in the presence of a variety of functional groups, to a formal total synthesis of (R)-mevalonolactone. Our mechanistic studies establish that the rate-determining step can vary with the structure of the alkyl bromide, and, most significantly, that L2PdHBr (L=phosphine), an often-invoked intermediate in palladium-catalyzed processes such as the Heck reaction, is not an intermediate in the active catalytic cycle.
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