Palladium(II)-Catalyzed Enyne Coupling Reaction Initiated by Acetoxypalladation of Alkynes and Quenched by Protonolysis of the Carbon−Palladium Bond
作者:Ligang Zhao、Xiyan Lu、Wei Xu
DOI:10.1021/jo050121n
日期:2005.5.1
key step in completing the Pd(II) catalytic cycle. The nitrogen-containing ligands, like halides, served to favor the protonolysis of the carbon−palladium bond over the β-H elimination in the Pd(II)-mediated reactions. The intermolecular coupling reactions provide an efficient method for synthesizing γ,δ-unsaturated carbonyls. The intramolecular coupling reactions offer a method to construct a variety
开发了由炔烃的乙酰氧基钯引发的二价钯催化的分子间和分子内烯炔偶联反应。该反应涉及炔烃的乙酰氧基钯化,然后是烯烃的插入和碳-钯键的质子分解。在双齿含氮配体存在下碳-钯键的质子分解是完成Pd(II)催化循环的关键步骤。含氮配体(如卤化物)在Pd(II)介导的反应中比β-H消除起了促进碳-钯键质子分解的作用。分子间偶联反应提供了一种合成γ,δ-不饱和羰基的有效方法。分子内偶联反应提供了一种构建各种合成上重要的碳环和杂环的方法。