Pd(II)-Catalyzed Hydroxyl-Directed C−H Olefination Enabled by Monoprotected Amino Acid Ligands
作者:Yi Lu、Dong-Hui Wang、Keary M. Engle、Jin-Quan Yu
DOI:10.1021/ja101909t
日期:2010.4.28
A novel Pd(II)-catalyzed ortho-C-H olefination protocol has been developed using spatially remote, unprotected tertiary, secondary, and primary alcohols as the directing groups. Mono-N-protected amino acid ligands were found to promote the reaction, and an array of olefin coupling partners could be used. When electron-deficient alkenes were used, the resulting olefinated intermediates underwent subsequent
使用空间遥远、未受保护的叔醇、仲醇和伯醇作为导向基团,开发了一种新型 Pd(II) 催化的邻-CH 烯化方案。人们发现单-N-保护的氨基酸配体可以促进反应,并且可以使用一系列烯烃偶联配偶体。当使用缺电子烯烃时,所得烯化中间体随后进行Pd(II)催化的氧化分子内环化,得到相应的吡喃产物,该产物可以在氢解条件下转化为邻位烷基化醇。讨论了氧化环化步骤的机制细节,并将其置于整个催化循环的背景下。