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
Fu GC
中科院分区:
化学1区
文献类型:
--
作者:
Bissember AC;Levina A;Fu GC

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我们已经利用了交叉偶联反应中通常不希望的基本步骤,β-氢化物消除,来实现烷基溴的钯催化脱卤化氢以形成末端烯烃。我们已经应用这种方法,在室温下,在各种官能团的存在下,以优异的产率进行正式的全合成(R)-甲羟戊酸内酯。我们的机理研究表明,速率决定步骤可以随烷基溴的结构而变化,最重要的是,L2 PdHBr(L=膦),一种经常在钯催化过程中调用的中间体,如赫克反应,不是活性催化循环中的中间体。
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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