A Mild, Palladium-Catalyzed Method for the Dehydrohalogenation of Alkyl Bromides: Synthetic and Mechanistic Studies
作者:Alex C. Bissember、Anna Levina、Gregory C. Fu
DOI:10.1021/ja306323x
日期:2012.8.29
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 have established that the rate-determining step can vary with the structure of the alkyl bromide and
我们在交叉偶联反应中利用了一个典型的不需要的基本步骤,即β-氢化物消除,以完成钯催化的烷基溴脱卤化氢以形成末端烯烃。我们已将这种在室温下在各种官能团存在下以优异收率进行的方法应用于 (R)-甲羟戊内酯的正式全合成。我们的机理研究已经确定,决定速率的步骤会随着烷基溴的结构而变化,最重要的是,L(2)PdHBr(L = 膦)是一种经常在钯催化过程中使用的中间体,例如Heck 反应不是活性催化循环的中间体。