Palladium-Catalyzed Direct Alkenylation of 2-Oxazolones: An Entry to 3,4,5-Trisubstituted 2-Oxazolones
作者:Zenghui Lu、Fang Luo、Lina Wang、Gangguo Zhu
DOI:10.1021/jo4018793
日期:2013.11.1
synthesis of 3,4,5-trisubstituted 2-oxazolones featuring the first Pd-catalyzed dehydrogenative alkenylation of 2-oxazolones, which is realized by employing 10 mol % of Pd(OAc)2 as the catalyst and the use of readily available Cu(OAc)2 as the oxidant. A wide range of functional groups, such as F, Cl, Br, OMe, ester, ketone, amide, alkyl, and aryl substituents, are found to be compatible under the reaction
本文描述了一种合成3,4,5-三取代的2-恶唑酮的新颖方法,其特征在于2-恶唑酮的第一次Pd催化的脱氢烯基化,其通过使用10mol%的Pd(OAc)2作为催化剂来实现。以及使用现成的Cu(OAc)2作为氧化剂。发现在反应条件下相容的官能团范围很广,例如F,Cl,Br,OMe,酯,酮,酰胺,烷基和芳基取代基。C–H官能化策略的利用为3,4,5-三取代的2-恶唑酮的构建提供了一种直接,方便且高度经济的方法。值得注意的是,4-烯基2-恶唑酮可平稳地转化为萘[1,2- d通过光化学转化获得]恶唑-2-酮。