Palladium-Catalyzed Oxidative Heck-Type Allylation of β,β-Disubstituted Enones with Allyl Carbonates
作者:Weiwei Jin、Qin Yang、Ping Wu、Jiping Chen、Zhengkun Yu
DOI:10.1002/adsc.201400076
日期:2014.6.16
The palladium‐catalyzed oxidative Heck‐type allylation of β,β‐disubstituted enones, i.e., α‐oxoketene dithioacetals, was efficiently realized with allyl carbonates, providing a concise route to highly functionalized dienes. The present synthetic methodology utilizes the substrate activation strategy to activate the CH bond of β,β‐disubstituted enones by introduction of a 1,2‐dithiolane functionality
β,β-二取代的烯酮(即α-氧杂环丁烯二硫缩醛)的钯催化氧化Heck型烯丙基化反应可通过碳酸烯丙酯有效地实现,从而为高官能化二烯的制备提供了一条简洁的途径。本合成方法利用了衬底激活策略,能活化 β的H键,β二取代烯酮通过引入的1,2-二硫戊环的功能,使烯酮基板高度极化,并由此提高其反应性,这表明对于罕见例子过渡金属催化的Heck型烯丙基化过程中的ß,ß-二取代的烯酮的烯丙基取代。