A Copper-Catalyzed Reductive Defluorination of β-Trifluoromethylated Enones via Oxidative Homocoupling of Grignard Reagents
作者:Xiaoting Wu、Fang Xie、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1021/acs.orglett.8b00379
日期:2018.3.16
An efficient copper-catalyzed reductive defluorination of β-trifluoromethylated enones via an oxidative homocoupling of Grignard reagents is reported. The reaction proceeded smoothly with a wide range of substrates, including the ones bearing aromatic heterocycles, such as furyl and thienyl ring systems in high yields (80–92%, except one example) under mild conditions. This provides a practical method
据报道,通过格氏试剂的氧化均偶联作用,铜可以有效地催化β-三氟甲基化烯酮的还原脱氟反应。在温和条件下,该反应可在多种底物上顺利进行,包括带有芳香杂环的底物,例如呋喃基和噻吩基环系,产率高(80–92%,一个例子除外)。这提供了合成宝石-二氟烯烃酮的实用方法。还值得注意的是,使用β-三氟甲基化的烯酮作为“氧化剂”的格氏试剂的均偶联过程对于Csp 2 –Csp 2和Csp 3 –Csp 3均有效。 形成的键,包括那些β-氢化物消除相应的过渡金属烷基络合物的底物特别容易,同时提供了高收率的偶联产物(83-95%)。