The regioselective Heck arylation of unsaturated alcohols is utilized as the key step in a convenient one-pot procedure for the production of 2,2-disubstituted tetrahydrofurans and tetrahydropyrans. The arylation reaction is effected with a palladium-diphosphine catalyst alongside a hydrogen bond donor; this is followed by the introduction of a Brønsted acid to the reaction mixture, affording the oxygen heterocycles in moderate yields.
不饱和醇的区域选择性 Heck 芳基化反应是生产 2,2-二取代的
四氢呋喃和
四氢吡喃的简便的一锅程序中的关键步骤。芳基化反应是在
钯-
二膦催化剂和氢键供体的作用下进行的,然后在反应混合物中引入布氏酸,以中等产率获得氧杂环。